oss-security - Re: Re: lockdown bypass on mainline kernel for loading unsigned modules

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Message-ID: <20200720163302.GB3712@suse.de>
Date: Mon, 20 Jul 2020 18:33:03 +0200
From: Marcus Meissner <meissner@...e.de>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: Re: Re: lockdown bypass on mainline kernel for
 loading unsigned modules

Hi,

CVE-2020-15780 was assigned to this.

Ciao, Marcus.
On Mon, Jun 15, 2020 at 05:03:12PM -0600, Jason A. Donenfeld wrote:
> Hi Mitre,
> 
> People are requesting a CVE to track this and are poking me to poke
> you to assign one. Note that this would be for a *different* CVE than
> the one I requested for the Ubuntu vulnerability a minute ago. This
> vulnerability here affects a different set of kernels and uses a
> different vector.
> 
> Jason
> 
> On Mon, Jun 15, 2020 at 4:26 AM Jason A. Donenfeld <Jason@...c4.com> wrote:
> >
> > Hi everyone,
> >
> > Yesterday, I found a lockdown bypass in Ubuntu 18.04's kernel using
> > ACPI table tricks via the efi ssdt variable [1]. Today I found another
> > one that's a bit easier to exploit and appears to be unpatched on
> > mainline, using acpi_configfs to inject an ACPI table. The tricks are
> > basically the same as the first one, but this one appears to be
> > unpatched, at least on my test machine. Explanation is in the header
> > of the PoC:
> >
> > https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language-2.sh
> >
> > I need to get some sleep, but if nobody posts a patch in the
> > meanwhile, I'll try to post a fix tomorrow.
> >
> > Jason
> >
> > [1] https://www.openwall.com/lists/oss-security/2020/06/14/1
> 

-- 
Marcus Meissner,SUSE LINUX GmbH; Maxfeldstrasse 5; D-90409 Nuernberg; Zi. 3.1-33,+49-911-740 53-432,,serv=loki,mail=wotan,type=real <meissner@...e.de>

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