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Date: Thu, 11 Apr 2024 12:52:58 -0700
From: Kyle Zeng <zengyhkyle@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: New Linux LPE via GSMIOC_SETCONF_DLCI?
Notice that my previous analysis on YuriiCrimson's exploits is their
ExploitGSM_6_5 version.
I cannot make the ExploitGSM_5_15_to_6_1 version work in the latest
kernel in my test environment. However, this does not rule out the
possibility that it still works.
And the splash of the ExploitGSM_6_5 exploit is attached to the email.
Thanks,
Kyle Zeng
On Thu, Apr 11, 2024 at 12:25 PM Kyle Zeng <zengyhkyle@...il.com> wrote:
>
> Hi there,
>
> I just did some preliminary analysis on this.
> There are in fact three exploits involved in this.
> CVE-2023-6546: https://github.com/Nassim-Asrir/ZDI-24-020/
> jmpe4x's GSM exploit:
> https://github.com/jmpe4x/GSM_Linux_Kernel_LPE_Nday_Exploit
> YuriiCrimson's GSM exploit: https://github.com/YuriiCrimson/ExploitGSM
>
> I tested all of them. All of them targeted the same subsystem (GSM),
> used the same KASLR leak method ("/sys/kernel/notes"). But there are
> two vulnerabilities involved here.
> In short. jmpe4x's and YuriiCrimson's exploits are the same, but the
> vulnerability is not CVE-2023-6546.
> !!!!!!!!!!!!
> It is a 0day that is not patched in the main tree yet.
> Not a patch gap.
> !!!!!!!!!!!!
>
> My analysis is performed on the latest commit of Linus's tree:
> ```
> commit e8c39d0f57f358950356a8e44ee5159f57f86ec5 (HEAD -> master,
> origin/master, origin/HEAD)
> Merge: 03a55b63919 325f3fb551f
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date: Wed Apr 10 19:48:05 2024 -0700
> ```
>
> And jmpe4x's and YuriiCrimson's are exactly the same. The difference
> is mostly spaces. The diff is attached to this email.
>
> Thanks,
> Kyle Zeng
>
>
> On Thu, Apr 11, 2024 at 8:07 AM Dr. Christopher Kunz
> <info@...istopher-kunz.de> wrote:
> >
> > Hi,
> >
> > > There are two exploits in Yurii's repo above, according to Yurii for two
> > > different bugs. The above is one of them. Perhaps also try the other?
> > The two exploit versions are for different kernels. The 6.5 exploit
> > doesn't compile on the Debian 12 6.1 kernel, and no Debian version
> > currently distributes a 6.5 kernel, AFAICT. I used
> > ExploitGSM_5_15_to_6_1/ExploitGSM and it worked.
> > > I don't know, and apparently it'd need to be two CVEs for two bugs that
> > > Yurii exploits.
> > Possibly. I'm definitely out of my depth trying to analyze which bugs
> > are being exploited.
> > > CVE-2023-52564: Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"
> > > https://lists.openwall.net/linux-cve-announce/2024/03/02/54
> > >
> > > Maybe CVE-2023-52564 is one of the bugs Yurii exploits, or maybe not.
> > > I didn't look into this closely enough to tell.
> >
> > Apparently not. Debian 12 "Bookworm" currently runs this kernel:
> >
> > Linux debianexploitgsm 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian
> > 6.1.76-1 (2024-02-01) x86_64 GNU/Linux
> >
> > According to the changelog, this kernel has the fix for CVE-2023-52564
> > included:
> > - Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"
> > (from
> > https://metadata.ftp-master.debian.org/changelogs//main/l/linux-signed-amd64/linux-signed-amd64_6.1.76+1_changelog)
> >
> > Still, the exploit works, so it must exploit a different issue.
> >
> > Just my two cents,
> >
> > --cku
> >
View attachment "splash.txt" of type "text/plain" (7100 bytes)
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