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Today — 14 August 2022Security Affairs

CISA, FBI shared a joint advisory to warn of Zeppelin ransomware attacks

14 August 2022 at 06:52

The US Cybersecurity and Infrastructure Security Agency (CISA) and the FBI are warning of Zeppelin ransomware attacks.

The US Cybersecurity and Infrastructure Security Agency (CISA) and the Federal Bureau of Investigation (FBI) have published a joint advisory to warn of Zeppelin ransomware attacks.

The Zeppelin ransomware first appeared on the threat landscape in November 2019 when experts from BlackBerry Cylance found a new variant of the Vega RaaS, dubbed Zeppelin.

The ransomware was involved in attacks aimed at technology and healthcare, defense contractors, educational institutions, manufacturers, companies across Europe, the United States, and Canada. At the time of its discovery, Zeppelin was distributed through watering hole attacks in which the PowerShell payloads were hosted on the Pastebin website.

Before deploying the Zeppelin ransomware, threat actors spend a couple of weeks mapping or enumerating the victim network to determine where data of interest is stored. The ransomware can be deployed as a .dll or .exe file or contained within a PowerShell loader.

Zeppelin actors request ransom payments in Bitcoin, they range from several thousand dollars to over a million dollars.

The group uses multiple attack vectors to gain access to victim networks, including RDP exploitation, SonicWall firewall vulnerabilities exploitation, and phishing attacks.

The threat actors also implement a double extortion model, threatening to leak stolen files in case the victims refuse to pay the ransom.

Zeppelin is typically deployed as a .dll or .exe file within a PowerShell loader. To each encrypted file, it appends a randomized nine-digit hexadecimal number as an extension. A ransom note is dropped on the compromised systems, usually on the desktop.

“The FBI has observed instances where Zeppelin actors executed their malware multiple times within a victim’s network, resulting in the creation of different IDs or file extensions, for each instance of an attack; this results in the victim needing several unique decryption keys.” reads the joint advisory.

The US agencies recommend not paying the ransom because there is no guarantee to recover the encrypted files and paying the ransomware will encourage the illegal practice of extortion.

The alert also included Indicators of Compromise (IOC) along with MITRE ATT&CK TECHNIQUES for this threat.

The FBI also encourages organizations to report any interactions with Zeppelin operators, including logs, Bitcoin wallet information, encrypted file samples, and decryptor files.

To mitigate the risks of ransomware attacks, organizations are recommended to define a recovery plan, implement multi-factor authentication, keep all operating systems, software, and firmware up to date, enforce a strong passwords policy, segment networks, disable unused ports and services, audit user accounts and domain controllers, implement a least-privilege access policy, review domain controllers, servers, workstations, and active directories, maintain offline backups of data, and identify, detect, and investigate abnormal activity and potential traversal of the indicated ransomware with a networking monitoring tool.

“The FBI is seeking any information that can be shared, to include boundary logs showing communication to and from foreign IP addresses, a sample ransom note, communications with Zeppelin actors, Bitcoin wallet information, decryptor files, and/or a benign sample of an encrypted file” concludes the alert.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, Zeppelin ransomware)

The post CISA, FBI shared a joint advisory to warn of Zeppelin ransomware attacks appeared first on Security Affairs.

Yesterday — 13 August 2022Security Affairs

Killnet claims to have breached Lockheed Martin

13 August 2022 at 16:51

Russian hacker group Killnet claims to have launched a DDoS attack on the aerospace and defense giant Lockheed Martin. 

The Moscow Times first reported that the Pro-Russia hacker group Killnet is claiming responsibility for a recent DDoS attack that hit the aerospace and defense giant Lockheed Martin.

The Killnet group also claims to have stolen data from a Lockheed Martin employee and threatened to share it.

killnet

The group has been active since March, it launched DDoS attacks against governments that expressed support to Ukraine, including Italy, Romania, Moldova, the Czech Republic, Lithuania, Norway, and Latvia.

In a video shared by the group on Telegram, the group claimed to have stolen the personal information of the Lockheed Martin employees, including names, email addresses, phone numbers, and pictures.

The group also shared two spreadsheets containing a message in Russian:

“If you have nothing to do, you can email Lockheed Martin Terrorists – photos and videos of the consequences of their manufactured weapons! Let them realize what they create and what they contribute to.” (Tanslated with Google).

At this time it is impossible to determine the real source of these data. Lockheed Martin is aware of the Killnet claims, but it did not comment on them.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, Killnet)

The post Killnet claims to have breached Lockheed Martin appeared first on Security Affairs.

Three flaws allow attackers to bypass UEFI Secure Boot feature

13 August 2022 at 09:39

Researchers discovered a flaw in three signed third-party UEFI boot loaders that allow bypass of the UEFI Secure Boot feature.

Researchers from hardware security firm Eclypsium have discovered a vulnerability in three signed third-party Unified Extensible Firmware Interface (UEFI) boot loaders that can be exploited to bypass the UEFI Secure Boot feature.

Secure Boot is a security feature of the latest Unified Extensible Firmware Interface (UEFI) 2.3.1 designed to detect tampering with boot loaders, key operating system files, and unauthorized option ROMs by validating their digital signatures. “Detections are blocked from running before they can attack or infect the system specification.”

UEFI Secure Boot

According to the experts, these three new bootloader vulnerabilities affect most of the devices released over the past 10 years, including x86-64 and ARM-based devices.

“These vulnerabilities could be used by an attacker to easily evade Secure Boot protections and compromise the integrity of the boot process;  enabling the attacker to modify the operating system as it loads, install backdoors, and disable operating system security controls.” reads the post published by the experts. “Much like our previous GRUB2 BootHole research, these new vulnerable bootloaders are signed by the Microsoft UEFI Third Party Certificate Authority. By default, this CA is trusted by virtually all traditional Windows and Linux-based systems such as laptops, desktops, servers, tablets, and all-in-one systems.”

Experts pointed out that these bootloaders are signed by the Microsoft UEFI Third Party Certificate Authority, the good news is that the IT giant has already addressed this flaw with the release of Patch Tuesday security updates for August 2020.

The flaws identified by the experts have been rated as:

  • CVE-2022-34301 – Eurosoft (UK) Ltd
  • CVE-2022-34302 – New Horizon Datasys Inc
  • CVE-2022-34303 – CryptoPro Secure Disk for BitLocker

The two CVE-2022-34301 and CVE-2022-34303 are similar in the way they involve signed UEFI shells, the first one the signed shell is esdiags.efi while for the third one (CryptoPro Secure Disk), the shell is Shell_Full.efi.

Threat actors can abuse built-in capabilities such as the ability to read and write to memory, list handles, and map memory, to allow the shell to evade Secure Boot. The experts warn that the exploitation could be easily automated using startup scripts, for this reason, it is likely that threat actors will attempt to exploit it in the wild.

“Exploiting these vulnerabilities requires an attacker to have elevated privileges (Administrator on Windows or root on Linux). However,  local privilege escalation is a common problem on both platforms. In particular, Microsoft does not consider UAC-bypass a defendable security boundary and often does not fix reported bypasses, so there are many mechanisms in Windows that can be used to elevate privileges from a non-privileged user to Administrator.” continues the post.

The exploitation of the New Horizon Datasys vulnerability (CVE-2022-34302) is more stealthy, system owners cannot detect the exploitation. The bootloader contains a built-in bypass for Secure Boot that can be exploited to disable the Secure Boot checks while maintaining the Secure Boot on.

“This bypass can further enable even more complex evasions such as disabling security handlers. In this case, an attacker would not need scripting commands, and could directly run arbitrary unsigned code. The simplicity of exploitation makes it highly likely that adversaries will attempt to exploit this particular vulnerability in the wild.” continues the post.

Experts highlighters that the exploitation of these vulnerabilities requires an attacker to have administrator privileges, which can be achieved in different ways.

“Much like BootHole, these vulnerabilities highlight the challenges of ensuring the boot integrity of devices that rely on a complex supply chain of vendors and code working together,” the post concludes. “these issues highlight how simple vulnerabilities in third-party code can undermine the entire process.”

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Pierluigi Paganini

(SecurityAffairs – hacking, UEFI Secure Boot)

The post Three flaws allow attackers to bypass UEFI Secure Boot feature appeared first on Security Affairs.

Before yesterdaySecurity Affairs

The US offers a $10M rewards for info on the Conti ransomware gang’s members

12 August 2022 at 17:58

The U.S. State Department announced a $10 million reward for information related to five individuals associated with the Conti ransomware gang.

The U.S. State Department announced a $10 million reward for information on five prominent members of the Conti ransomware gang. The government will also reward people that will provide details about Conti and its affiliated groups TrickBot and Wizard Spider.

The reward is covered by the Rewards of Justice program operated by the a U.S. Department of State which offers rewards for information related to threats to homeland security.

According to Wired, which first reported the announcement, the State Department is looking for the members’ physical locations and vacation and travel plans.

This is the first time that the U.S. Government shows the face of a Conti associate, referred to as “Target.”

“Today marks the first time that the US government has publicly identified a Conti operative,” says a State Department official who asked not to be named and did not provide any more information about Target’s identity beyond the picture. “That photo is the first time the US government has ever identified a malicious actor associated with Conti,” 

The other members of the Conti gang for which the US Government is offering a reward are referred to as “Tramp,” “Dandis,” “Professor,” and “Reshaev.”

The U.S. Government reveals the face of a Conti associate for the first time! We’re trying to put a name with the face!

To the guy in the photo: Imagine how many cool hats you could buy with $10 million dollars!

Write to us via our Tor-based tip line: https://t.co/WvkI416g4W pic.twitter.com/28BgYXYRy2

— Rewards for Justice (@RFJ_USA) August 11, 2022

In February, a Ukrainian researcher leaked 60,694 messages internal chat messages belonging to the Conti ransomware operation after the announcement of the group of its support to Russia..

The leaked files revealed that some high-level members of the gang have connections to Russian intelligence.

The Rewards of Justice program also offer rewards for information on other threat actors, including the REvil ransomware gang, Darkside gang, the Evil Corp, and the North Korea-liked APT groups.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, Conti ransomware)

The post The US offers a $10M rewards for info on the Conti ransomware gang’s members appeared first on Security Affairs.

Experts warn of mass exploitation of an RCE flaw in Zimbra Collaboration Suite

12 August 2022 at 08:00

Threat actors are exploiting an authentication bypass Zimbra flaw, tracked as CVE-2022-27925, to hack Zimbra Collaboration Suite email servers worldwide.

An authentication bypass affecting Zimbra Collaboration Suite, tracked as CVE-2022-27925, is actively exploited to hack ZCS email servers worldwide.

Zimbra is an email and collaboration platform used by more than 200,000 businesses from over 140 countries.

Yesterday, August 11, CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. The two issues are:

  • CVE-2022-27925 (CVSS score: 7.2) – Zimbra Collaboration (ZCS) Arbitrary File Upload Vulnerability: Zimbra Collaboration (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 which allows for unauthenticated remote code execution.
  • CVE-2022-37042 – Zimbra Collaboration (ZCS) Authentication Bypass Vulnerability: Zimbra Collaboration (ZCS) contains an authentication bypass vulnerability in MailboxImportServlet. This vulnerability was chained with CVE-2022-27925 which allows for unauthenticated remote code execution.

CISA orders federal agencies to fix both issues by August 25, 2022.

The vendor has already released security updates to address both vulnerabilities.

Cybersecurity firm Volexity described confirmed that the flaw is actively exploited in attacks in the wild.

In July and early August 2022, the company worked on multiple incidents where the organizations had their Zimbra Collaboration Suite (ZCS) email servers compromised. Volexity discovered that threat actors have exploited the CVE-2022-27925 remote-code-execution (RCE) vulnerability in these attacks.

The flaw was patched in March 2022, since the release of security fixes, it was reasonable that threat actors performed reverse engineering of them and developed an exploit code.

“As each investigation progressed, Volexity found signs of remote exploitation but no evidence the attackers had the prerequisite authenticated administrative sessions needed to exploit it. Further, in most cases, Volexity believed it extremely unlikely the remote attackers would have been able to obtain administrative credentials on the victims’ ZCS email servers.” reads the advisory published by Volexity.

“As a result of the above findings, Volexity initiated more research into determining a means to exploit CVE-2022-27925, and if it was possible to do so without an authenticated administrative session. Subsequent testing by Volexity determined it was possible to bypass authentication when accessing the same endpoint (mboximport) used by CVE-2022-27925. This meant that CVE-2022-27925 could be exploited without valid administrative credentials, thus making the vulnerability significantly more critical in severity.” reads the post published by Volexity.

Volexity researchers scanned the Internet for compromised Zimbra instances belonging to non-Volexity customers. The security firm identified over 1,000 ZCS instances around the world that were backdoored and compromised. The compromised ZCS installs belongs to a variety of global organizations, including government departments and ministries, military branches, worldwide billionaire businesses, and a significant number of small businesses.

Zimbra

The countries with the most compromised instances include the U.S., Italy, Germany, France, India, Russia, Indonesia, Switzerland, Spain, and Poland.

“CVE-2022-27925 was originally listed as an RCE exploit requiring authentication. When combined with a separate bug, however, it became an unauthenticated RCE exploit that made remote exploitation trivial. Some organizations may prioritize patching based on the severity of security issues. In this case, the vulnerability was listed as medium—not high or critical—which may have led some organizations to postpone patching.” concludes the post.

A few days ago, CISA added a recently disclosed flaw in the Zimbra email suite, tracked as CVE-2022-27924, to its Known Exploited Vulnerabilities Catalog.

In middle June, researchers from Sonarsource discovered the high-severity vulnerability impacting the Zimbra email suite, tracked as CVE-2022-27924 (CVSS score: 7.5). It can be exploited by an unauthenticated attacker to steal login credentials of users without user interaction.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, RCE)

The post Experts warn of mass exploitation of an RCE flaw in Zimbra Collaboration Suite appeared first on Security Affairs.

BazarCall attacks have revolutionized ransomware operations

12 August 2022 at 06:25

The Conti ransomware gang is using BazarCall phishing attacks as an initial attack vector to access targeted networks.

BazarCall attack, aka call back phishing, is an attack vector that utilizes targeted phishing methodology and was first used by the Ryuk ransomware gang in 2020/2021.

The BazarCall attack chain is composed of the following stages:

  • Stage One. Attackers send a mail to the victims that notify them that they have subscribed to a service for which payment is automatic. The email includes a phone number to call to cancel the subscription.
  • Stage Two. The victim is tricked into contacting a special call center. When operators receive a call, they use a variety of social engineering tactics, to convince victims to give remote desktop control, to help them cancel their subscription service.
  • Stage Three. Once accessed the victim’s desktop, the attacker silently extended a foothold in the user’s network, weaponizing legitimate tools that are known to be in Conti’s arsenal. The initial operator remains on the line with the victim, pretending to assist them with the remote desktop access by continuing to utilize social engineering tactics.
  • Stage Four. The initiated malware session yields the adversary access as an initial point of entry into the victim’s network.
bazarcall conti

The researchers at cybersecurity firm AdbIntel state that currently at least three autonomous threat groups are adopting and independently developing their own targeted phishing tactics derived from the call back phishing methodology. The three groups are tracked as Silent Ransom, Quantum, and Roy/Zeon, they emerged after the Conti gang opted to shut down its operation in May 2022.

In March 2022, formed members of the Conti, who were experts in call back phishing attacks, created “Silent Ransom” when it became an autonomous group.

Silent Ransom’s previous bosses, tracked as Conti Team Two, who were the main Conti subdivision, rebranded as Quantum and launched their own version of call back phishing campaigns. On June 13, 2022, AdvIntel researchers uncovered a massive operation called “Jörmungandr”.

The third iteration of the BazarCall group was observed in late June 20 and goes by the name of Roy/Zeon. The group is composed of old-Guard members of Conti’s “Team One,” which created the Ryuk operation. This group has the advanced social engineering capabilities of the three groups.

It involved large investments into hiring spammers, OSINT specialists, designers, call center operators, and expanding the number of network intruders. As a highly skilled (and most likely government-affiliated) group, Quantum was able to purchase exclusive email datasets and manually parse them to identify relevant employees at high-profile companies.

bazarcall

The adoption of Callback phishing campaigns has impacted the strategy of ransomware gangs, experts observed targeted attacks aimed at Finance, Technology, Legal, and Insurance industries. The industries are considered privileged targets in almost all internal manuals, which were shared between ex-Conti members.

“Since its resurgence in March earlier this year, call back phishing has entirely revolutionized the current threat landscape and forced its threat actors to reevaluate and update their methodologies of attack in order to stay on top of the new ransomware food chain.” concludes the report published by Advintel. “Although the first to begin using this TTP as its primary initial attack vector, Silent Ransom is no longer the only threat group utilizing the highly specified phishing operations that they pioneered. Other threat groups, seeing the success, efficiency, and targeting capabilities of the tactic have begun using reversed phishing campaign as a base and developing the attack vector into their own.”

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Pierluigi Paganini

(SecurityAffairs – hacking, Conti)

The post BazarCall attacks have revolutionized ransomware operations appeared first on Security Affairs.

Palo Alto Networks warns of Reflected Amplification DoS issue in PAN-OS

11 August 2022 at 17:58

Palo Alto Networks devices running the PAN-OS are abused to launch reflected amplification denial-of-service (DoS) attacks.

Threat actors are exploiting a vulnerability, tracked as CVE-2022-0028 (CVSS score of 8.6), in Palo Alto Networks devices running the PAN-OS to launch reflected amplification denial-of-service (DoS) attacks.

The vendor has learned that firewalls from multiple vendors are abused to conduct distributed denial-of-service (DDoS) attacks, but it did not disclose the name of the impacted companies.

“Palo Alto Networks recently learned that an attempted reflected denial-of-service (RDoS) attack was identified by a service provider. This attempted attack took advantage of susceptible firewalls from multiple vendors, including Palo Alto Networks. We immediately started to root cause and remediate this issue.” reads the advisory published by Palo Alto Networks. “Exploitation of this issue does not impact the confidentiality, integrity, or availability of our products.

The root cause of the issue affecting the Palo Alto Network devices is a misconfiguration in the PAN-OS URL filtering policy that allows a network-based attacker to conduct reflected and amplified TCP DoS attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against a target chosen by the attackers.

Palo Alto Networks GlobalProtect VPN

The issue could be exploited if the firewall configuration has a URL filtering profile with one or more blocked categories assigned to a security rule with a source zone that has an external facing network interface.

The flaw can be mitigated by removing the URL filtering policy, the company also recommends enabling only one security feature between packet-based attack protection and flood protection on their Palo Alto.

If exploited, this flaw would not impact the confidentiality, integrity, or availability of Palo Alto Networks products. However, the company pointed out that the resulting denial-of-service (DoS) attack may allow threat actors to hide their identity and implicate the firewall as the source of the attack.

Below is the Product Status shared by the vendor:

Versions Affected Unaffected
Cloud NGFW None All
PAN-OS 10.2 < 10.2.2-h2 >= 10.2.2-h2 (ETA: week of August 15, 2022)
PAN-OS 10.1 < 10.1.6-h6 >= 10.1.6-h6
PAN-OS 10.0 < 10.0.11-h1 >= 10.0.11-h1 (ETA: week of August 15, 2022)
PAN-OS 9.1 < 9.1.14-h4 >= 9.1.14-h4 (ETA: week of August 15, 2022)
PAN-OS 9.0 < 9.0.16-h3 >= 9.0.16-h3 (ETA: week of August 15, 2022)
PAN-OS 8.1 < 8.1.23-h1 >= 8.1.23-h1 (ETA: August 15, 2022)
Prisma Access 3.1 None All
Prisma Access 3.0 None All
Prisma Access 2.2 None All
Prisma Access 2.1 None All

The US Cybersecurity and Infrastructure Security Agency (CISA) also published a security advisory to warn of this vulnerability.

“Palo Alto Networks has released a security update to address a vulnerability in PAN-OS firewall configurations. A remote attacker could exploit this vulnerability to conduct a reflected denial-of service,” reads the advisory published by CISA.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, CVE-2022-0028)

The post Palo Alto Networks warns of Reflected Amplification DoS issue in PAN-OS appeared first on Security Affairs.

Ex Twitter employee found guilty of spying for Saudi Arabian government

11 August 2022 at 05:50

A former Twitter employee was found guilty of spying on certain Twitter users for Saudi Arabia.

A former Twitter employee, Ahmad Abouammo (44), was found guilty of gathering private information of certain Twitter users and passing them to Saudi Arabia.

“Ahmad Abouammo, a US resident born in Egypt, was found guilty by a jury Tuesday of charges including acting as an agent for Saudi Arabia, money laundering, conspiracy to commit wire fraud and falsifying records, following a two-week trial in San Francisco federal court.” reported Bloomberg.

The man faces from 10 up to 20 years in prison when he’s sentenced. 

In November 2019, the former Twitter employees Abouammo and the Saudi citizen Ali Alzabarah have been charged with spying on thousands of Twitter user accounts on behalf of the Saudi Arabian government. The two former Twitter employees operated for the Saudi Arabian government with the intent of unmasking dissidents using the social network.

Representatives of the Saudi Arabian government recruited the duo in 2014, their mission was to gather non-public information of Twitter accounts associated with known prominent critics of the Kingdom of Saudi Arabia and the Royal Family.

Abouammo and Alzabarah had unauthorized access to information associated with some profiles, including email addresses, devices used, user-provided biographical information, birth dates, logs that contained the user’s browser information, a log of all of a particular user’s actions on the Twitter platform at any given time, and other info that can be used to geo-locate a user such as IP addresses and phone numbers.

According to the indictment, Alzabarah joined Twitter in August 2013 as a “site reliability engineer,” he worked with the Saudi officials between May 21 and November 18, 2015. He is accused of allegedly spied on more than 6,000 Twitter accounts, including tens of users for which Saudi Arabian law enforcement had submitted emergency disclosure requests to Twitter.

Abouammo was charged with acting as a foreign agent on US soil, it also provided falsified records to feds to interfere with their investigation.

The man also deleted certain information from the social media platform and in some cases, he shut down Twitter accounts at the request of Saudi government officials. Of course, he was also able to unmask the identities of some users on behalf of the Saudi Arabian Government.

Saudi officials paid up to $300,000 to Abouammo for his work, the indictment explained that it was possible by masquerading the payments with faked invoices. The document also states that the man received a Hublot Unico Big Bang King Gold Ceramic watch.

According to an indictment, Abouammo lied to FBI agents saying the watch was a replica costing $500 and that the last $100,000 wire from Al-Asaker was for legitimate freelance consulting work.

US DoJ Department of Justice has also charged the Saudi national Ahmed al Mutairi, also known as Ahmed ALJBREEN, who directed a Saudi Saudi social media marketing company with ties to the royal family.

Ahmed al Mutairi, was acting as an intermediary between the two former Twitter employees and the officials of the Saudi Arabian Government.

Abouammo was arrested by the FBI in November 2019 in Seattle

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, cyberespionage)

The post Ex Twitter employee found guilty of spying for Saudi Arabian government appeared first on Security Affairs.

Cisco fixed a flaw in ASA, FTD devices that can give access to RSA private key

11 August 2022 at 05:47

Cisco addressed a high severity flaw, tracked as CVE-2022-20866, affecting Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) software.

Cisco addressed a high severity vulnerability in its Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) software.

The flaw, tracked as CVE-2022-20866, impacts the handling of RSA keys on devices running Cisco ASA Software and FTD Software, an unauthenticated, remote attacker can trigger it to retrieve an RSA private key. Once obtained the key, the attackers can impersonate a device that is running ASA/FTD Software or to decrypt the device traffic.

“This vulnerability is due to a logic error when the RSA key is stored in memory on a hardware platform that performs hardware-based cryptography. An attacker could exploit this vulnerability by using a Lenstra side-channel attack against the targeted device. A successful exploit could allow the attacker to retrieve the RSA private key.” reads the advisory published by the IT giant.

The advisory states that the following conditions may be observed on an affected device:

  • This issue will impact approximately 5 percent of the RSA keys on a device that is running a vulnerable release of ASA Software or FTD Software; not all RSA keys are expected to be affected due to mathematical calculations applied to the RSA key.
  • The RSA key could be valid but have specific characteristics that make it vulnerable to the potential leak of the RSA private key. 
  • The RSA key could be malformed and invalid. A malformed RSA key is not functional, and a TLS client connection to a device that is running Cisco ASA Software or Cisco FTD Software that uses the malformed RSA key will result in a TLS signature failure, which means a vulnerable software release created an invalid RSA signature that failed verification. If an attacker obtains the RSA private key, they could use the key to impersonate a device that is running Cisco ASA Software or Cisco FTD Software or to decrypt the device traffic.

The flaw impacts products running vulnerable Cisco ASA (9.16.1 and later) or Cisco FTD (7.0.0 and later) software that perform hardware-based cryptographic functions:

  • ASA 5506-X with FirePOWER Services
  • ASA 5506H-X with FirePOWER Services
  • ASA 5506W-X with FirePOWER Services
  • ASA 5508-X with FirePOWER Services
  • ASA 5516-X with FirePOWER Services
  • Firepower 1000 Series Next-Generation Firewall
  • Firepower 2100 Series Security Appliances
  • Firepower 4100 Series Security Appliances
  • Firepower 9300 Series Security Appliances
  • Secure Firewall 3100

Cisco recommends administrators of ASA/FTD devices to remove malformed or susceptible RSA keys and possibly revoke any certificates associated with those RSA keys, because it is possible that the RSA private key has been leaked to a malicious actor.

The flaw was reported by Nadia Heninger and George Sullivan of the University of California San Diego and Jackson Sippe and Eric Wustrow of the University of Colorado Boulder.

Cisco has credited Nadia Heninger and George Sullivan of the University of California San Diego and Jackson Sippe and Eric Wustrow of the University of Colorado Boulder for reporting the security flaw.

The Product Security Incident Response Team (PSIRT) is not aware of attacks in the wild exploiting this issue.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, ASA)

The post Cisco fixed a flaw in ASA, FTD devices that can give access to RSA private key appeared first on Security Affairs.

Cisco was hacked by the Yanluowang ransomware gang

10 August 2022 at 21:20

Cisco discloses a security breach, the Yanluowang ransomware group breached its corporate network in late May and stole internal data.

Cisco disclosed a security breach, the Yanluowang ransomware group breached its corporate network in late May and stole internal data.

The investigation conducted by Cisco Security Incident Response (CSIRT) and Cisco Talos revealed that threat actors compromised a Cisco employee’s credentials after they gained control of a personal Google account where credentials saved in the victim’s browser were being synchronized. 

Once obtained the credentials, the attackers launched voice phishing attacks in an attempt to trick the victim into accepting the MFA push notification started by the attacker.

Upon achieving an MFA push acceptance, the attacker had access to the VPN in the context of the targeted user.

“Initial access to the Cisco VPN was achieved via the successful compromise of a Cisco employee’s personal Google account. The user had enabled password syncing via Google Chrome and had stored their Cisco credentials in their browser, enabling that information to synchronize to their Google account.” reads the analysis published by Cisco Talos. “After obtaining the user’s credentials, the attacker attempted to bypass multifactor authentication (MFA) using a variety of techniques, including voice phishing (aka “vishing”) and MFA fatigue, the process of sending a high volume of push requests to the target’s mobile device until the user accepts, either accidentally or simply to attempt to silence the repeated push notifications they are receiving.”

The attacker conducted a series of sophisticated voice phishing attacks under the guise of various trusted organizations attempting to convince the victim to accept multi-factor authentication (MFA) push notifications initiated by the attacker. The attacker ultimately succeeded in achieving an MFA push acceptance, granting them access to VPN in the context of the targeted user. 

According to Talos, once the attacker had obtained initial access, they enrolled a series of new devices for MFA and authenticated successfully to the Cisco VPN. Then the threat actors escalated to administrative privileges before logging into multiple systems. The attackers were able to drop multiple tools in the target network, including remote access tools like LogMeIn and TeamViewer, Cobalt Strike, PowerSploit, Mimikatz, and Impacket.

Talos researchers added that the attackers were not able to steal sensitive data from the IT giant.

“We confirmed that the only successful data exfiltration that occurred during the attack included the contents of a Box folder that was associated with a compromised employee’s account. The data obtained by the adversary in this case was not sensitive.” continues the analysis.

Cisco said that the Yanluowang gang did not deploy any ransomware on its network during the attack.

The Yanluowang ransomware group is attempting to extort the company and published a list of files stolen from the company threatening to leak all stolen data if Cisco will not pay the ransom.

#yanluowang ransomware has posted #Cisco to its leaksite. #cybersecurity #infosec #ransomware pic.twitter.com/kwrfjbwbkT

— CyberKnow (@Cyberknow20) August 10, 2022

Cisco said that the Yanluowang gang did not deploy any ransomware on its network during the attack.

“While we did not observe ransomware deployment in this attack, the TTPs used were consistent with “pre-ransomware activity,” activity commonly observed leading up to the deployment of ransomware in victim environments. Many of the TTPs observed are consistent with activity observed by CTIR during previous engagements.” Talos experts conclude. “Our analysis also suggests reuse of server-side infrastructure associated with these previous engagements as well. In previous engagements, we also did not observe deployment of ransomware in the victim environments.”

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, Yanluowang ransomware)

The post Cisco was hacked by the Yanluowang ransomware gang appeared first on Security Affairs.

Risky Business: Enterprises Can’t Shake Log4j flaw

10 August 2022 at 17:17

70% of Large enterprises that previously addressed the Log4j flaw are still struggling to patch Log4j-vulnerable assets.

INTRODUCTION

In December 2021 security teams scrambled to find Log4j-vulnerable assets and patch them. Eight months later many Global 2000 firms are still fighting to mitigate the digital assets and business risks associated with Log4j. The ease of Log4j vulnerability exploitation coupled with the critical nature of the bug, which allows attackers to run arbitrary code inside cloud and company networks, is driving a business-risk imperative to find vulnerable assets and patch them fast.  

Log4j CVE-2021-44832

An examination by CyCognito of large enterprise external attack surfaces found 70% of firms that previously addressed Log4j in their attack surface are still struggling to patch Log4j-vulnerable assets and prevent new instances of Log4j from resurfacing within their IT stack.

Our research highlights business continuity risks such as digital asset sprawl, subsidiary risk and the importance of reducing the time it takes to identify a vulnerable Log4j asset and patch it.

Log4j: Analysis of Current and Lasting Legacy

On Dec. 9, 2021 the Log4j critical vulnerability (CVE-2021-44228) was first identified and was assigned a severity rating of 10 out of 10. It is a remote code execution class flaw found in the Apache Log4j library (part of the Apache Logging Project). This Log4j vulnerability is considered extremely dangerous because it is easy to exploit and soon after its discovery a public proof-of-concept became available.

Eight months later, Log4j has proven to be one of the worst vulnerabilities of the last few years, if not decade.

A July report (PDF) by the U.S. Department of Homeland Security stated: “The Log4j event is not over. Log4j remains deeply embedded in systems, and even within the short period available for our review, community stakeholders have identified new compromises, new threat actors, and new learnings.”

Report Highlights:

Our exclusive analysis of Log4j examines the external attack surfaces of three dozen Global 2000 companies, securely protected by CyCognito solutions. This report underscores the Log4j cybersecurity risks facing non-CyCognito customers and the at large cybersecurity community.

Incidents of vulnerable Log4j assets discovered by the CyCognito platform are based on simulated adversarial scans of exposed assets in the wild. These instances of Log4j (now mitigated) represented briefly exposed assets that, if overlooked, could have allowed an attacker access to the cloud or on-premises assets and networks of these organizations.   

Top Log4j Takeaways for July 2022:  

  • Instances of Log4j-vulnerable assets are growing, not shrinking within a subset of companies examined.
  • Some firms are seeing a doubling of Log4j-vulnerable digital assets within their external attack surface – not a decrease.
  • Only 30% of firms with at least one past Log4j issue had no Log4j-vulnerable assets at the time of our analysis.
  • Of those exposed Log4j-vulnerable assets, the most common were web applications.

Drilling Down on Data Points

Growing not Shrinking: After eradicating an external attack surface of Log4j-vulnerable digital assets, new instances of Log4j-vulnerable systems have come back online. 

Of those firms with at least one Log4j vulnerability discovered in January 2022, 62% continued to report one or more Log4j-vulnerable assets exposed in July. Research did not indicate whether those were new or existing exposures.

Of the firms that did have an exposed asset in July, 38% experienced a gain of one or more Log4j-vulnerable assets. Data indicates that, for many companies, instances of new Log4j exposed assets remains a growing problem.   

Double the Log4j Trouble: An examination of organizations revealed 21% of those with vulnerable assets in July experienced a triple-digit percentage growth in the number of exposed Log4j-vulnerable assets compared to January.

While the initial number of vulnerable assets were small within each organization examined, over a half-dozen are seeing a steady increase in the number of Log4j-vulnerable assets. One firm, with seven exposed assets in February of 2022 had 39 exposed assets in July.

Success Rates Rare: The number of organizations that experienced a drop in vulnerable assets was 38%. In each of those instances, CyCognito found zero instances of Log4J in their internet exposed attack surface in July.

Thirty-four percent of those firms with over one vulnerable asset in January had the same number of assets exposed in July.

Web App Worries: Breaking down the numbers even more, data reveals those firms with vulnerable assets had a greater number of web applications vulnerable to a Log4j exploit versus other types of systems.

This is concerning given web apps are high risk for business and their users alike because they often access or contain sensitive financial, confidential, or personally identifiable information.

Why Businesses are Struggling to Quash Log4j  

A CyCognito analysis of why companies are struggling to squelch Log4j vulnerabilities once and for all are multifold.

First, organizations have underestimated the deep-rooted prevalence of Log4j software, and software vendors have not yet rid their products of the vulnerable Log4j code. The battle to mitigate Log4j-vulnerable assets is exacerbated by new instances of exploitable Log4j being introduced to an attack surface.

Further driving this trend is attack surface sprawl, subsidiary and business-unit risk, mergers and acquisitions (M&A) and a lag in the time to remediate vulnerabilities (known as mean-time-to-remediate, or MTTR). 

CyCognito found that among Global 2000 companies, M&A activity is growing or shrinking an organization’s attack surface by 5.5% each month (PDF). Organizations were initially unaware of 10-to-30% of their subsidiaries, according to separate CyCognito research published in June.

(See related CyCognito June report: “Anybody Got a Map?”)

The global consultancy Bain & Company reports that M&A activity in 2022 is likely to reach US$4.7 trillion in deal value, making it the second-largest year on record. That kind of business change combined with emergent risks and poor IT ecosystem visibility make it extremely difficult for security and IT managers to have a 360-degree view of their entire external attack surface. This increases the odds of security gaps in their attack surface going unseen, opening them up to dangerous and preventable risks such as Log4j.  

Why a Focus on Risk, Versus Vulnerability, is Paramount to Log4j Exposures  

Trends in the growth of external attack surface sprawl are making it harder for security teams to reduce the mean time to remediate vulnerabilities – including Log4j.

In June 2021, the average time to fix a high-risk application vulnerability was estimated at 246 days (8.2 months), soaring from 194 days (6.5 months) at the start of that year, according to a study from Synopsys.

A CyCognito-sponsored research report by Informa Tech found security teams are suffering from cybersecurity debt issues. That’s when new cybersecurity issues outpace a security teams’ ability to mitigate existing ones.

Compounding the problem is inadequate and incomplete security scanning of external attack surfaces for vulnerabilities and other risks. CyCognito found competing discovery tools can leave between 10-to-50% of digital assets undiscovered and therefore untested and ignored.  

Informa Tech found the majority of security teams only have the bandwidth to remediate about 50 vulnerabilities in an average month. Considering the deluge of new vulnerabilities discovered each month, current remediation rates are insufficient to keep pace with high and critical risk vulnerabilities such as Log4j issues. 

That’s why CyCognito advocates a business-risk-first management approach to cybersecurity that focuses on identifying and addressing the most urgent risks (such as Log4j) immediately within an attack surface.  

If you want to have info on how CyCognito can help organizations find and remediate Log4j business risks with its unmatched ability to continuously discover the external attack surfaces of its customers give a look at the original analysis of the company:  

https://www.cycognito.com/blog/log4j_risky-business?hs_preview=SXnnXKfC-81448195746

About the author: TOM SPRING, MEDIA MANAGER

Tom Spring, Media Manager, is a seasoned technology reporter and editor who has helped bring stories to life for over three decades.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, Log4j flaw)

The post Risky Business: Enterprises Can’t Shake Log4j flaw appeared first on Security Affairs.

Experts found 10 malicious packages on PyPI used to steal developers’ data

10 August 2022 at 15:14

10 packages have been removed from the Python Package Index (PyPI) because they were found harvesting data.

Check Point researchers have discovered ten malicious packages on the Python Package Index (PyPI). The packages install info-stealers that allow threat actors to steal the private data and personal credentials of the developers.

The researchers provide details about the malicious packages:

  • Ascii2text is a malicious package that mimics the popular art package by name and description. The code on the __init__.py file downloads and executes a malicious script that searches for local passwords and uploads them using a discord web hook.
  • Pyg-utilsPymocks and PyProto2 are malicious packages to that allows attackers to steal users’ AWS credentials.
  • Free-net-vpn and Free-net-vpn2 are malicious packages developed to target environment variables.
  • Test-async downloads and executes malicious payloads.
  • Zlibsrc downloads and executes malicious payloads.
  • Free-net-vpn and Free-net-vpn2 are malicious packages that target environment variables.
  • WINRPCexploit a malicious package that steals users’ credentials as part of its setup.py installation script.
  • Browserdiv is able to steal the installers credentials by collecting and sending them to a predefined discord webhook.
PyPI 2
Ascii2Text The malicious snippet inside the __init__.py

Unfortunately, in recent months, many other malicious packages have been found on the official PyPI repository.

In June 2022, Sonatype researchers discovered multiple Python packages in the official PyPI repository that have been developed to steal secrets (i.e. AWS credentials and environment variables) and also upload these to a publicly exposed endpoint.

In November 2021, JFrog researchers discovered 11 malicious Python packages in the Python Package Index (PyPI) repository that can steal Discord access tokens, passwords, and even carry out dependency confusion attacks.

Supply chain attacks are designed to exploit trust relationships between an organization and external parties. These relationships could include partnerships, vendor relationships, or the use of third-party software. Cyber threat actors will compromise one organization and then move up the supply chain, taking advantage of these trusted relationships to gain access to other organizations’ environments.” concludes the report. “Such attacks became more frequent and grew in impact in recent years, therefore it is essential developers make sure are keeping their actions safe, double checking every software ingredient in use and especially such that are being downloaded from different repositories, especially ones which were not self-created.”

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, PyPI)

The post Experts found 10 malicious packages on PyPI used to steal developers’ data appeared first on Security Affairs.

Hackers behind Twilio data breach also targeted Cloudflare employees

10 August 2022 at 13:48

Cloudflare revealed that at least 76 employees and their family members were targeted by smishing attacks similar to the one that hit Twilio.

The content delivery network and DDoS mitigation company Cloudflare revealed this week that at least 76 employees and their family members received text messages on their personal and work phones.

According to the company, the attack is very similar to the one that recently targeted the Communications company Twilio.

“Yesterday, August 8, 2022, Twilio shared that they’d been compromised by a targeted phishing attack. Around the same time as Twilio was attacked, we saw an attack with very similar characteristics also targeting Cloudflare’s employees.” reads the announcement published by Cloudflare. While individual employees did fall for the phishing messages, we were able to thwart the attack through our own use of Cloudflare One products, and physical security keys issued to every employee that are required to access all our applications.”

cloudflare smishing

Cloudflare pointed out that its systems were not compromised, it also added that its Cloudforce One threat intelligence team was able to perform additional analysis of the attack.

The experts believe that this is a sophisticated attack targeting employees and systems of multiple organizations,

On July 20, 2022, the company received reports of employees receiving text messages containing links to what appeared to be a Cloudflare Okta login page. The company uses Okta as its identity provider and messages include a link to a phishing page that was designed to look identical to a legitimate Okta login page.  The attackers sent the messages to at least 76 employees in less than 1 minute, but the company security team was not able to determine how the threat actors obtained the list of employees’ phone numbers.

“They came from four phone numbers associated with T-Mobile-issued SIM cards: (754) 268-9387, (205) 946-7573, (754) 364-6683 and (561) 524-5989. They pointed to an official-looking domain: cloudflare-okta.com.” continues the report. “That domain had been registered via Porkbun, a domain registrar, at 2022-07-20 22:13:04 UTC — less than 40 minutes before the phishing campaign began.”

Once the recipient of the message has provided his credentials through the phishing page, the credentials were immediately sent to the attacker via the messaging service Telegram. Experts states that the real-time relay was crucial for the attackers because the phishing page would also prompt for a Time-based One Time Password (TOTP) code. Once obtained this info the attackers can access the victim company’s actual login page.

According to Cloudflare, only three employees fell for the phishing message and entered their credentials. However, the company does not use TOTP codes, instead, its employees use a FIDO2-compliant security YubiKey key. This means that without the hardware key, attackers cannot access the company systems even knowing the credentials.

Researchers also discovered that in some cases the phishing page was used to deliver the malicious payloads, including AnyDesk’s remote access software. The software would allow an attacker to control the victim’s machine remotely.

“We confirmed that none of our team members got to this step. If they had, however, our endpoint security would have stopped the installation of the remote access software.” concludes Cloudflare.

Follow me on Twitter: @securityaffairs and Facebook

Pierluigi Paganini

(SecurityAffairs – hacking, smishing)

The post Hackers behind Twilio data breach also targeted Cloudflare employees appeared first on Security Affairs.

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