Publications

Scraps of Notes on Exploiting Exim Vulnerabilities

08/10/2019 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

17/09/2019 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.

Exploiting a No-Name FreeBSD Kernel Vulnerability

24/07/2019 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.

Using your BMC as a DMA device: plugging PCILeech to HPE iLO 4

20/12/2018 This blogpost aims at describing a method to turn a vulnerable HP iLO 4 instance into a DMA-capable device with the associated connector for PCILeech, the reference tool for memory acquisition and manipulation through DMA accesses.

Code Check(mate) in SMM

18/12/2018 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.

Kinibi TEE: Trusted Application exploitation

10/12/2018 This blog post is dedicated to the Trustonic's TEE implementation and more particularly to the integration made by Samsung for its Exynos chipsets. Samsung recently patched a trivial vulnerability in a Trusted Application. After a brief explanation of TrustZone/Kinibi, this article details the exploitation of this vulnerability.

LightSpeed, a race for an iOS/MacOS sandbox escape!

29/10/2018 iOS 12 was released a few weeks ago and fixed a kernel vulnerability we discovered that can be used to escape the sandbox. This blogpost gives the technical write-up of the vulnerability.

iOS12 Kernelcache Laundering

01/10/2018 iOS 12 has been released for a few weeks now. New major iOS versions often mean new kernelcache and dyld_shared_cache file formats. iOS12 is no exception to the rule and comes with an other surprise: Pointer Authentication Code (PAC) for the new A12 chip. This blogpost shows you how to deal with both by enhancing IDA. IDA 7.2 beta future release might add PAC and iOS12 kernelcache support but it will only be released in a few weeks and we think it will always be interesting to illustrate how to do it by ourselves. ...

netdata apps.plugin security fixes

19/04/2018 Synacktiv met netdata in the wild in the last few months. This blog post aims at telling the story of a vulnerability which was first forgotten 1 year ago and then partially fixed. On a standard setup, the vulnerability can be exploited by gid netdata to read arbitrary files owned by root. On a weak setup (as seen in the wild by Synacktiv), the vulnerability can be exploited by all users.

HP iLO talk at Recon Brx 2018

07/02/2018 Since we presented our vulnerability in HP Integrated Lights-Out (iLO) 4 to Recon Brussels, we are now releasing the slides and tools that were developed during our study.