Publications

Scraps of Notes on Exploiting Exim Vulnerabilities

mar 08/10/2019 - 16:40
Exploit
Recently, Qualys published an advisory about a severe vulnerability impacting Exim MTA: CVE-2019-15846. In their report, they even claim that they do have a PoC granting a remote attacker root privileges. The report was followed by instant alarmist articles: "Millions of Exim servers vulnerable to ..."

BFS 2019 Exploitation Challenge

mar 17/09/2019 - 16:35
Challenges
Exploit
On September 7th, 2019, BFS published an exploitation challenge on Windows 10 x64 to win an entry for the BFS-IOACTIVE party during the Ekoparty conference. This blogpost aims at describing a successful resolution of the challenge.

"No grave but the SIP": Reversing a VoIP phone firmware

ven 30/08/2019 - 14:00
Reverse-engineering
When conducting internal intrusion tests, one can find interesting to access the phones used by a client, as they are often connected to an internal network and can provide some kind of persistent access. This article presents the research done for getting a good grasp on the firmware of Yealink VoIP phones, which enables us to analyze further the underlying system.

2019 summer challenge writeup

mar 30/07/2019 - 10:39
Challenges
The 2019 summer challenge is now closed! This was a bit of a departure from the usual hardened binaries, as it showcased a programming model that is not a distant relative of the Turing machine. This article will give a high level overview of the challenge's solution, and some behind-the scenes comments.

Exploiting a No-Name FreeBSD Kernel Vulnerability

mer 24/07/2019 - 16:29
Exploit
A new patch has been recently shipped in FreeBSD kernels to fix a vulnerability (cve-2019-5602) present in the cdrom device. In this post, we will introduce the bug and discuss its exploitation on pre/post-SMEP FreeBSD revisions.

icmp-reachable

mar 19/03/2019 - 15:33
Système
A strange behavior was observed by Synacktiv experts during the security assessment of a stateful firewall implementation... After few coffees & RFCs it was understood that it could be a generic issue that might affect multiple IP stacks. So... What is a strange firewall behavior ? This article presents an implicit behavior of Linux nftables and OpenBSD PacketFilter? regarding the filtering of ICMP and ICMPv6 packets we considered as a security issue. It allows an attacker to bypass filtering rules in some cases an...

Code Check(mate) in SMM

mar 18/12/2018 - 16:17
Exploit
In this article, a bypass of the SMM_CODE_CHK_EN, the equivalent of the SMEP protection for the System Management Mode (SMM), protection is explained. This article first explain the protection and the bug class it impacts, then the idea of the bypass is detailed and a leak is explained for being able to make it work.