Exploit on THALIUM

Don't judge an audiobook by its cover: taking over your Amazon account with a Kindle

Tue, 16 Dec 2025 08:00:00 +0000

Although Kindle e-readers are a prime target in modding and jailbreaking communities, there is little public work about vulnerability research in remote code execution scenarios.

In this post, we give technical details about a chain of vulnerabilities we identified that can be triggered by downloading a malicious Audible audiobook, allowing to take full control of the device and its registered Amazon account.

ECW 2023: Centralized Memory (write-up)

Tue, 07 Nov 2023 12:00:00 +0100

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.

ECW 2023: The Calculator in Shadow (write-up)

Tue, 07 Nov 2023 12:00:00 +0100

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.

ARM TrustZone: pivoting to the secure world

Fri, 24 Mar 2023 13:37:00 +0000

Discovery of two vulnerabilities in secure world components
Exploitation to get code execution in a trusted driver, while not having a debugger for this obscure environment
Leverage of aarch32 T32 instruction set to find nice stack pivots
Turning an arbitrary write into an arbitrary code execution

Remote Deserialization Bug in Microsoft's RDP Client through Smart Card Extension (CVE-2021-38666)

Fri, 10 Dec 2021 06:00:01 +0100

This is the third installment in my three-part series of articles on fuzzing Microsoft’s RDP client, where I explain a bug I found by fuzzing the smart card extension.

Remote ASLR Leak in Microsoft's RDP Client through Printer Cache Registry (CVE-2021-38665)

Fri, 10 Dec 2021 06:00:00 +0100

This is the second installment in my three-part series of articles on fuzzing Microsoft’s RDP client. I will explain a bug I found by fuzzing the printer sub-protocol, and how I exploited it.

ECW 2021 - WriteUp

Mon, 25 Oct 2021 12:00:01 +0100

For the European Cyber Week CTF 2021 Thalium created some challenges in our core competencies: reverse and exploitation. This blog post presents some of the write-ups:

Chest (36 solve) - reverse
FSB as a service (3 solve) - exploitation
WYSIWYG (3 solve) - reverse
Pipe Dream (1 solve) - reverse
- the author posted his solution on his personal blog

Thalium’s challenges have been less resolved than others. They were not that difficult, but probably a bit more unexpected. A few additional challenges designed by Thalium are: