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Reverse Engineering & Exploiting Dell CVE-2021-21551

19 May 2021 at 14:56
By: 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 […]

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CVE‑2021‑1079 – NVIDIA GeForce Experience Command Execution

5 May 2021 at 07:11
By: voidsec

NVIDIA GeForce Experience (GFE) v.<= 3.21 is affected by an Arbitrary File Write vulnerability in the GameStream/ShadowPlay plugins, where log files are created using NT AUTHORITY\SYSTEM level permissions, which lead to Command Execution and Elevation of Privileges (EoP). NVIDIA Security Bulletin – April 2021 NVIDIA Acknowledgements Page This blog post is a re-post of the […]

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Exploiting System Mechanic Driver

14 April 2021 at 13:30
By: 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: β€œWrite an exploit for System […]

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Software Testing Methodologies & Approaches to Fuzzing

24 February 2021 at 08:35
By: voidsec

This blog post is part of a series and a re-posting of the original article β€œFuzzing 101” that I have written for Yarix on YLabs. Introduction In this article, I would like to introduce fuzz testing as part of a vast overview of software testing approaches used to discover bugs and vulnerabilities within applications, protocols, […]

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Announcing ECG v2.0

11 January 2021 at 13:39
By: voidsec

We are proud to announce that ECG got its first major update. ECG: is the first and single commercial solution (Static Source Code Scanner) able to analyze & detect real and complex security vulnerabilities inΒ TCL/ADPΒ source-code. ECG’s v2.0 New Features On-Premises Deploy: Scan your code repository on your secure and highly-scalable offline appliance with a local […]

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Tivoli Madness

18 November 2020 at 15:40
By: voidsec

TL; DR: this blog post serves as an advisory for both: CVE-2020-28054: An Authorization Bypass vulnerability affecting JamoDat – TSMManager Collector v. <= 6.5.0.21 A Stack Based Buffer Overflow affecting IBM Tivoli Storage Manager – ITSM Administrator Client Command Line Administrative Interface (dsmadmc.exe) Version 5, Release 2, Level 0.1. Unfortunately, after I had one of […]

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.NET Grey Box Approach: Source Code Review & Dynamic Analysis

7 October 2020 at 13:19
By: voidsec

Following a recent engagement, I had the opportunity to check and verify some possible vulnerabilities on an ASP .NET application. Despite not being the deepest technical nor innovative blog post you could find on the net, I have decided to post it anyway in order to explain the methodology I adopt to verify possible vulnerabilities. […]

The post .NET Grey Box Approach: Source Code Review & Dynamic Analysis appeared first on VoidSec.

CVE-2020-1337 – PrintDemon is dead, long live PrintDemon!

11 August 2020 at 12:52
By: voidsec

Banner Image by Sergio Kalisiak TL; DR: I will explain, in details, how to trigger PrintDemon exploit and dissect how I’ve discovered a new 0-day; Microsoft Windows EoP CVE-2020-1337, a bypass of PrintDemon’s recent patch via a Junction Directory (TOCTOU). Contents PrintDemon primer, how the exploit works? PrinterPort WritePrinter Shadow Job File Binary Diffing CVE-2020-1048 […]

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A tale of a kiosk escape: β€˜Sricam CMS’ Stack Buffer Overflow

13 May 2020 at 15:24
By: voidsec

TL;DR: Shenzhen Sricctv Technology Sricam CMS (SricamPC.exe) <= v.1.0.0.53(4) and DeviceViewer (DeviceViewer.exe) <= v.3.10.12.0 (CVE-2019-11563) are affected by a local Stack Buffer Overflow. By creating a specially crafted β€œUsername” and copying its value in the β€œUser/mail” login field, an attacker will be able to gain arbitrary code execution in the context of the currently logged-in […]

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Tabletopia: from XSS to RCE

8 April 2020 at 15:02
By: voidsec

During this period of social isolation, a friend of mine proposed to play some online β€œboard games”. He proposed β€œTabletopia”: a cool sandbox virtual table with more than 800 board games. Tabletopia is both accessible from its own website and from the Steam’s platform. While my friends decided to play from their browser, I’ve opted […]

The post Tabletopia: from XSS to RCE appeared first on VoidSec.

SLAE – Assignment #7: Custom Shellcode Crypter

2 April 2020 at 14:55
By: voidsec

Assignment #7: Custom Shellcode Crypter Seventh and last SLAE’s assignment requires to create a custom shellcode crypter. Since I had to implement an entire encryption schema both in python as an helper and in assembly as the main decryption routine, I’ve opted for something simple. I’ve chosen the Tiny Encryption Algorithm (TEA) as it does […]

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SLAE – Assignment #6: Polymorphic Shellcode

2 April 2020 at 14:39
By: voidsec

Assignment #6: Polymorphic Shellcode Sixth SLAE’s assignment requires to create three different (polymorphic) shellcodes version starting from published Shell Storm’s examples. I’ve decided to take this three in exam: http://shell-storm.org/shellcode/files/shellcode-752.php – linux/x86 execve (β€œ/bin/sh”) – 21 bytes http://shell-storm.org/shellcode/files/shellcode-624.php – linux/x86 setuid(0) + chmod(β€œ/etc/shadow”,0666) – 37 bytes http://shell-storm.org/shellcode/files/shellcode-231.php – linux/x86 open cd-rom loop (follows β€œ/dev/cdrom” symlink) […]

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SLAE – Assignment #5: Metasploit Shellcode Analysis

26 March 2020 at 13:52
By: voidsec

Assignment #5: Metasploit Shellcode Analysis Fifth SLAE’s assignment requires to dissect and analyse three different Linux x86 Metasploit Payload. Metasploit currently has 35 different payloads but almost half of it are Meterpreter version, thus meaning staged payloads. I’ve then decided to skip meterpreter payloads as they involve multiple stages and higher complexity that will break […]

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SLAE – Assignment #4: Custom shellcode encoder

17 March 2020 at 11:08
By: voidsec

Assignment #4: Custom Shellcode Encoder As the 4th SLAE’s assignment I was required to build a custom shellcode encoder for the execve payload, which I did, here how. Encoder Implementations I’ve decided to not relay on XORing functionalities as most antivirus solutions are now well aware of this encoding schema, the same reason for which […]

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Perform a Nessus scan via port forwarding rules only

13 March 2020 at 09:34
By: voidsec

This post will be a bit different from the usual technical stuff, mostly because I was not able to find any reliable solution on Internet and I would like to help other people having the same doubt/question, it’s nothing advanced, it’s just something useful that I didn’t see posted before. During a recent engagement I […]

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SLAE – Assignment #3: Egghunter

20 February 2020 at 15:25
By: voidsec

Assignment #3: Egghunter This time the assignment was very interesting, here the requirements: study an egg hunting shellcode and create a working demo, it should be configurable for different payloads. As many before me, I’ve started my research journey with Skape’s papers: β€œSearching Process Virtual Address Space”. I was honestly amazed by the paper content, […]

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