Remote Play Together, developed by Valve, allows sharing local multi-player games with friends over the network through streaming. The associated protocol is elaborate enough to shelter a valuable attack surface that has scarcely been ventured into in the past.
This post covers the reverse engineering of the protocol and client/server implementations inside Steam, before presenting a dedicated fuzzer that unveiled a few critical vulnerabilities.
Centralized Memory was a hard Linux pwn challenge created for the European Cyber Week CTF 2023 qualifiers. This write-up covers the intended method of exploitation through a race condition, an AES padding bug and a stack overflow.
kaleidoscope was a hard reverse engineering challenge created for the European Cyber Week CTF 2023 qualifiers, with a focus on Windows-specific mechanisms and VM-based obfuscation.
The Calculator in Shadow was a hard pwn challenge created for the European Cyber Week CTF 2023 qualifiers. It included exploiting a RISC-V calculator running on top of a customized QEMU that featured a poorly implemented shadow stack.
In this article, we discuss our research approach for investigating Xiaomi routers. We discovered multiple vulnerabilities allowing Remote Code Execution (RCE) on several models, through both LAN and WAN interfaces. This work led to the publication of four CVEs specifically targeting Xiaomi routers.
The Android permission management system has already suffered from several vulnerabilities in the past. Such weaknesses can grant dangerous permissions to a malevolent application, an example being CALL_LOG, which gives access to all incoming and outgoing calls.
This post dives into the Android permission system and how a solver was leveraged to find new vulnerabilities. With this approach, a privilege escalation was identified, which was fixed and assigned CVE-2023-20947 by Google.
In this blogpost, we introduce the analysis of one SMB implementation: kSMBd. It will be followed up by a talk at OffensiveCon 2023 named “Abusing Linux in-kernel SMB server to gain kernel remote code execution”.
Although the Android base is open source, many different constructors customize it with their own UIs and APIs. All these additions represent an extra attack surface that can change from one phone model to another. We tried to automatically fuzz the closed-source system services powering these modifications, discovering CVE-2022-39907 and CVE-2022-39908 along the way.
Microsoft’s Remote Desktop Protocol (RDP) client was fuzzed by various teams in the past few years, it thus seemed like a good target to try a recent snapshot fuzzer:
what the fuzz (wtf) (of which we are only users). In this companion post to our
Hexacon 2022 talk (
slides,
video) we’ll show how we took advantage of wtf flexibility in order to efficiently fuzz the RDPEGFX channel of Microsoft RDP client and uncover
CVE-2022-30221.