Recently, a threat actor (TA) known as SpyBot posted a tool, on a Russian hacking forum, that can terminate any antivirus/Endpoint Detection & Response (EDR/XDR) software. IMHO, all the hype behind this announcement was utterly unjustified as it is just another instance of the well-known Bring Your Own Vulnerable Driver (BYOVD) attack technique: where a […]

The post Reverse Engineering Terminator aka Zemana AntiMalware/AntiLogger Driver appeared first on VoidSec.

With this blog post I’d like to sum up my year-long Windows Drivers research; share and detail my own methodology for reverse engineering (WDM) Windows drivers, finding some possible vulnerable code paths as well as understanding their exploitability. I’ve tried to make it as “noob-friendly” as possible, documenting all the steps I usually perform during […]

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This blog post serves as an advisory for a couple of MSI’s products that are affected by multiple high-severity vulnerabilities in the driver components they are shipped with. All the vulnerabilities are triggered by sending specific IOCTL requests and will allow to: Directly interact with physical memory via the MmMapIoSpace function call, mapping physical memory […]

The post Merry Hackmas: multiple vulnerabilities in MSI’s products appeared first on VoidSec.

As part of my continuous security research journey, during this year I’ve spent a good amount of time reverse-engineering Windows drivers and exploiting kernel-mode related vulnerabilities. While in the past there were (as far as I know), at least two good IDA plugins aiding in the reverse engineering process: DriverBuddy of NCC Group. win_driver_plugin of […]

The post Driver Buddy Reloaded appeared first on VoidSec.

The post Crucial’s MOD Utility LPE – CVE-2021-41285 appeared first on VoidSec.

Last week SentinelOne disclosed a “high severity” flaw in HP, Samsung, and Xerox printer’s drivers (CVE-2021-3438); the blog post highlighted a vulnerable strncpy operation with a user-controllable size parameter but it did not explain the reverse engineering nor the exploitation phase of the issue. With this blog post, I would like to analyse the vulnerability […]

The post Root Cause Analysis of a Printer’s Drivers Vulnerability CVE-2021-3438 appeared first on VoidSec.

At the beginning of the month, Sentinel One disclosed five high severity vulnerabilities in Dell’s firmware update driver. As the described vulnerability appeared not too complicated to exploit, a lot of fellow security researchers started weaponizing it. I was one of, if not the first tweeting about weaponizing it into a _SEP_TOKEN_PRIVILEGES overwrite exploit, and […]

The post Reverse Engineering & Exploiting Dell CVE-2021-21551 appeared first on VoidSec.

Last month we (last & VoidSec) took the amazing Windows Kernel Exploitation Advanced course from Ashfaq Ansari (@HackSysTeam) at NULLCON. The course was very interesting and covered core kernel space concepts as well as advanced mitigation bypasses and exploitation. There was also a nice CTF and its last exercise was: “Write an exploit for System […]

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