Publications

Your vulnerability is in another OEM!

jeu 02/09/2021 - 12:00
Exploit
Reverse-engineering
Among targets for the Pwn2own Tokyo 2020 was 2 NAS, the Synology DiskStation DS418play and Western Digital My Cloud Pro PR4100. We took a look at both, and quickly found out Western Digital PR4100 was vulnerable via its webserver. However, exploitation was not THAT easy (it was not that hard either) and ultimately it did not even mattered since the vulnerability was wiped by a major OS update pushed mere days before the contest. In the end, the vulnerable code we audited might not have even been written by Western D...

RM -RF IS THE ROOT OF ALL EVIL

jeu 27/05/2021 - 16:00
Challenges
Reverse-engineering
There are some days where things do not go your way. And there are some other days where they go catastrophically wrong. Several months ago, I had the unfortunate experience of wiping 2 years of my work. This blogpost explains why this tragedy happened and what I did to recover some critical data from the ashes of my SSD.

Investigating IDA Lumina feature

mar 15/12/2020 - 13:25
Tools
Reverse-engineering
Lumina is a built-in function recognition feature of the well-known IDA pro disassembler that relies on an online signature database. Unfortunately, the database server is not available for local private use. Have you ever raged at a misstyped hotkey that sent your database content to the Lumina servers, wondered how it works, what kind of data is sent, and wished for a local server under your control? This blog post might answer some of your questions.

iOS 1-day hunting: uncovering and exploiting CVE-2020-27950 kernel memory leak

mar 01/12/2020 - 10:09
Exploit
Reverse-engineering
Back in the beginning of November, Project Zero announced that Apple has patched a full chain of vulnerabilities that were actively exploited in the wild. This chain consists in 3 vulnerabilities: a userland RCE in FontParser as well as a memory leak and a type confusion in the kernel. In this blogpost, we will describe how we identified and exploited the kernel memory leak.

DJI Pilot Android Application Security Analysis

mar 04/08/2020 - 12:35
Systems
Reverse-engineering
On 23/07/2020, we published a study of the DJI GO4 application. This application, allowing to control a drone, is dedicated to the consumer grade aircraft segment. We also studied DJI Pilot, the application dedicated to professionals and companies, in order to assess its security and look at the difference between the two apps. We found similar issues to those listed in our previous blogpost in this application, such as a forced update mechanism.

DJI Android GO 4 application security analysis

jeu 23/07/2020 - 16:41
Systems
Reverse-engineering
Drones are currently one of the most dynamic products, with multiple use cases across sectors such as personal and commercial videography, farming and land surveying, law enforcement and national security, and more. One of the market leaders, China-based Daijiang Innovations (DJI), is often in the news for suspected cybersecurity and data privacy issues. While there are technical reports sponsored by DJI stating that their associated mobile application, DJI GO 4, is harmless and does not send any personal information b...

A journey in reversing UEFI Lenovo Passwords Management

lun 08/06/2020 - 09:39
Reverse-engineering
In this blog post the goal is to explain how I started looking at the Lenovo password. We will start by looking at how the reverse was started and the different kinds of passwords in the firmware, before having a more in depth look at two of them: the Power-On Password and the Bios Passwords. No vulnerability has been identified (yet) in the management of those passwords, but without further ado let get started.

I'm SMBGhost, daba dee daba da

jeu 12/03/2020 - 17:19
Exploit
Reverse-engineering
This blogpost was created due to a mistake from Microsoft, releasing publicly an advance warning for CVE-2020-0796. CVE-2020-0796, also nicknamed "SMBGhost" or "Coronablue" is a vulnerability impacting SMBv3.1.1 servers and clients and currently has no fix (12/03/2020).