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Date: Thu, 11 Apr 2024 09:06:13 +0200
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From: Donald Buczek <buczek@molgen.mpg.de>
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Subject: Re: [oss-security] New Linux LPE via GSMIOC_SETCONF_DLCI?

On 4/10/24 21:56, Dr. Christopher Kunz wrote:
> Hello all,
> 
> it seems that a new LPE (or two) in the Linux kernel has been dropped. The situation is a bit confusing and after discussing with Alexander off-list, I decided to post the various versions of the bug and the corresponding PoCs.
> 
> Maybe we can clear this up together.
> 
> 1. YuriiCrimson's version (April 6-ish)
> 
> It seems to use GSMIOC_SETCONF_DLCI, PoC supposedly works on current Ubuntu and Debians, but is stopped by LKRG.

Thanks!

For other distros or self-rolled kernels: Depends on CONFIG_N_GSM.

D.

> PoC and writeup are here: https://github.com/YuriiCrimson/ExploitGSM/tree/main
> 
> 2. jmpeaux' version (March 21)
> 
> This seems similar, also using GSMIOC_SETCONF_DLCI. In the screen shots, even the working dir for the PoC is identical to 1). Yurii claims jmpeaux stole his work.
> 
> Writeup: https://jmpeax.dev/The-tale-of-a-GSM-Kernel-LPE.html
> 
> PoC: https://github.com/jmpe4x/GSM_Linux_Kernel_LPE_Nday_Exploit/tree/main
> 
> And then there's
> 
> 3. ZDI-24-020 / CVE-2023-6546 (January)
> 
> This also exploits a race condition resulting UAF in the gsm_dlci struct. It's a little older.
> 
> Writeup and PoC: https://github.com/Nassim-Asrir/ZDI-24-020/
> 
> What do you make of this?
> 
> Best regards,
> 
> --cku
> 

-- 
Donald Buczek
buczek@molgen.mpg.de
Tel: +49 30 8413 1433