New Linux LPE via GSMIOC_SETCONF_DLCI?

                							

                <!--X-Body-Begin-->
<!--X-User-Header-->

oss-sec
mailing list archives
<!--X-User-Header-End-->
<!--X-TopPNI-->

By Date

By Thread

</form>

<!--X-TopPNI-End-->
<!--X-MsgBody-->
<!--X-Subject-Header-Begin-->
New Linux LPE via GSMIOC_SETCONF_DLCI?

<!--X-Subject-Header-End-->
<!--X-Head-of-Message-->

From: "Dr. Christopher Kunz" &lt;info () christopher-kunz de&gt;

Date: Wed, 10 Apr 2024 21:56:33 +0200

<!--X-Head-of-Message-End-->
<!--X-Head-Body-Sep-Begin-->

<!--X-Head-Body-Sep-End-->
<!--X-Body-of-Message-->
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.

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

<!--X-Body-of-Message-End-->
<!--X-MsgBody-End-->
<!--X-Follow-Ups-->

<!--X-Follow-Ups-End-->
<!--X-References-->
<!--X-References-End-->
<!--X-BotPNI-->

By Date

By Thread

Current thread:

New Linux LPE via GSMIOC_SETCONF_DLCI? Dr. Christopher Kunz (Apr 10)

<!--X-BotPNI-End-->
<!--X-User-Footer-->
<!--X-User-Footer-End-->