Using AFL++ on bug bounty programs: an example with Gnome libsoup
Published on Wed 30 October 2024 by @sigabrt9
A case study in using AFL++, afl-cov and basic custom harnesses to find a bug in libsoup for a public bug bounty program.
CVE-2024-45844: Privilege escalation in F5 BIG-IP
Published on Thu 17 October 2024 by myst404 (@myst404_)
This article describes the F5 BIG-IP CVE-2024-45844 root cause.
Deep diving into F5 Secure Vault
Published on Tue 04 June 2024 by myst404 (@myst404_)
This article describes in details how the F5 Secure Vault works. Security weaknesses were found during this analysis.
Post-Exploiting an F5 Big-IP: root, and now what?
Published on Wed 29 May 2024 by @lowercase_drm, myst404 (@myst404_)
This article describes multiple post-exploitation techniques specific for F5 BIG-IP. It includes capabilities like intercepting/decrypting TLS traffic or decrypting secrets in the Secure Vault. Detection methods are provided for Blue Teams.
LDAP authentication in Active Directory environments
Published on Tue 31 October 2023 by @lowercase_drm
Understanding the different types of LDAP authentication methods is fundamental to apprehend subjects such as relay attacks or countermeasures. This post introduces them through the lens of Python libraries.
Windows Installer arbitrary content manipulation Elevation of Privilege (CVE-2020-0911)
Published on Thu 06 July 2023 by @clavoillotte
The Windows Installer accesses the MSI files in C:\Windows\Installer while impersonating the user (and using the impersonated user's device map), and trusts these files to perform elevated/privileged operations such as registry key creation. This can be abused by an unprivileged user to obtain SYSTEM privileges.
Shell in the Ghost: Ghostscript CVE-2023-28879 writeup
Published on Tue 11 April 2023 by @sigabrt9
This write-up details how CVE-2023-28879 - an RCE in Ghostscript - was found and exploited. Due to the prevalence of Ghostscript in PostScript processing, this vulnerability may be reachable in many applications that process images or PDF files (think ImageMagick, PIL, etc.), making this an important one to patch and look out for.
SANS Christmas Challenge 2022
Published on Fri 06 January 2023 by Yannick Méheut
Yannick's write-up for the 2022 SANS Christmas Challenge.
Authenticating with certificates when PKINIT is not supported
Published on Wed 04 May 2022 by Yannick Méheut
A certificate obtained through Active Directory Certificate Services is usually used to get a TGT or recover the NT hash using PKINIT. But what can we do when it's not possible?
Bypassing LDAP Channel Binding with StartTLS
Published on Thu 28 April 2022 by @lowercase_drm
While doing research on LDAP client certificate authentication, we realized that the LDAP implementation of Active Directory supports the StartTLS mechanism, which has interesting implications on relay attacks.
LDAP relays for initial foothold in dire situations
Published on Mon 28 March 2022 by @SAERXCIT
Implementing existing attacks & techniques necessitating a domain account as black box LDAP relays to facilitate gaining initial access to a hardened domain.
SANS Christmas Challenge 2021
Published on Tue 04 January 2022 by Yannick Méheut
Yannick's write-up for the 2021 SANS Christmas Challenge.
HowTo: intercept mutually-authenticated TLS communications of a Java thick client
Published on Wed 31 March 2021 by @SAERXCIT
A quick guide on how to intercept TLS communications of a hardened Java thick client implementing client certificate authentication and certificate pinning using jdb.
SANS Christmas Challenge 2020
Published on Mon 11 January 2021 by Yannick Méheut
Yannick's write-up for the 2020 SANS Christmas Challenge.
DisplayLink USB Graphics Software arbitrary file write Elevation of Privilege
Published on Wed 01 July 2020 by Yannick Méheut
Due to overpermissive access rights on a logging folder, the DisplayLink USB Graphics software can be abused to perform privileged file operations, such as arbitrary file creation. This can be exploited, e.g. via DLL hijacking on the privileged DisplayLink process, to obtain SYSTEM privileges on the local machine.
Playing with GZIP: RCE in GLPI (CVE-2020-11060)
Published on Tue 12 May 2020 by myst404 (@myst404_)
GLPI is vulnerable to a Remote Code Execution (RCE) via the backup feature (CVE-2020-11060).
Multiple vulnerabilities in GLPI
Published on Tue 12 May 2020 by myst404 (@myst404_)
Multiple vulnerabilities affect GLPI (CVE-2020-5248, CVE-2020-11034, CVE-2020-11035, CVE-2020-11036 and CVE-2020-11062), including static key used to encrypt sensitive data, Open Redirect, and several XSS.
Testing the testers: solving a customer's private CTF
Published on Fri 08 May 2020 by Almond OffSec Team
Write-up for a private CTF, offered by customer for an RFP candidate selection, with web, crypto and binary exploitation challenges.
SANS Christmas Challenge 2019
Published on Tue 14 January 2020 by Yannick Méheut
Yannick's write-up for the 2019 SANS Christmas Challenge.
Windows Error Reporting Manager arbitrary file move Elevation of Privilege (CVE-2019-1315)
Published on Tue 08 October 2019 by @clavoillotte
The privileged file operations performed by the Windows Error Reporting service on user-writable files can be abused to rename/move arbitrary files with SYSTEM privileges. This can be used by an unprivileged user to obtain SYSTEM privileges.
(Super) Magic Hashes
Published on Mon 07 October 2019 by myst404 (@myst404_)
Magic hashes are well known specific hashes used to exploit Type Juggling attacks in PHP. Combined with bcrypt limitations, we propose the concept of Super Magic Hashes. These hashes can detect 3 different vulnerabilities: type juggling, weak password storage and incorrect Bcrypt usage. A Go PoC found some MD5, SHA1 and SHA224 super magic hashes.
Osquery for Windows access right misconfiguration Elevation of Privilege (CVE-2019-3567)
Published on Tue 04 June 2019 by @clavoillotte
An access right misconfiguration in Osquery for Windows can be abused to load run arbitrary programs or load arbitrary DLLs. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.
An introduction to privileged file operation abuse on Windows
Published on Wed 20 March 2019 by @clavoillotte
This is a (bit long) introduction on how to abuse file operations performed by privileged processes on Windows for local privilege escalation (user to admin/system), and a presentation of available techniques, tools and procedures to exploit these types of bugs.
F-Secure SAFE arbitrary file copy Elevation of Privilege
Published on Wed 20 March 2019 by @clavoillotte
A privileged file copy performed by SAFE when an infected file is detected can be abused to overwrite an arbitrary file. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.
McAfee Endpoint Security arbitrary file write Elevation of Privilege (CVE-2019-3582)
Published on Wed 20 March 2019 by @clavoillotte
The permissive access rights on logs and quarantine (files / folders and configuration), and the privileged file manipulation performed by McAfee Endpoint Security on these files can be abused to create or delete arbitrary files, or to create arbitrary registry keys. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.
Pulse Secure client arbitrary file write Elevation of Privilege (CVE-2018-11002)
Published on Wed 20 March 2019 by @clavoillotte
The permissive access rights on log folder, files and shared memory section, as set by the Pulse Secure client’s logging service, can be abused to create arbitrary files with write access. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.
SANS Christmas Challenge 2018
Published on Mon 14 January 2019 by Yannick Méheut
🎵 I'm dreaming of a pwned Christmaaaaas 🎵 As usual, here's my write-up for the 2018 SANS Christmas Challenge.
SANS Christmas Challenge 2017
Published on Wed 10 January 2018 by Yannick Méheut
'Tis the season to be pwning, falalalala lalalala. Each year, the SANS team publishes a Christmas Challenge against which anyone can test their skills. This year was no exception, and here's our write-up for the 2017 SANS Christmas Challenge.
UAC bypass via elevated .NET applications
Published on Fri 15 September 2017 by @clavoillotte
.NET Framework can be made to load a profiling DLL or a COM component DLL via user-defined environment variables and CLSID registry entries, even when the process is elevated. This behavior can be exploited to bypass UAC in default settings on Windows 7 to 10 (including the latest RS3 builds) by making an auto-elevate .NET process (such as MMC snap-ins) load an arbitrary DLL.