oss-security - Re: CVE request: v86d: Failure to validate netlink message sender

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Message-ID: <1926483466.299316.1298926424618.JavaMail.root@zmail01.collab.prod.int.phx2.redhat.com>
Date: Mon, 28 Feb 2011 15:53:44 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley <coley@...re.org>
Subject: Re: CVE request: v86d: Failure to validate netlink
 message sender

Please use CVE-2011-1070

Thanks.

-- 
    JB


----- Original Message -----
> Versions of the v86d userspace helper for the Linux uvesafb driver
> before 0.1.10 did not verify that received netlink messages were sent
> by the kernel, allowing unprivileged users to manipulate the video
> mode and potentially other consequences.
> 
> v86d executes video BIOS code with access to /dev/mem in response to
> netlink messages, using either vm86 mode or an x86 emulator, depending
> on configuration. I an unclear on whether it is possible to e.g. crash
> the machine or escalate privileges by spoofing requests, or only to
> mess with the video card.
> 
> References:
> http://repo.or.cz/w/v86d.git/commit/f9abfd412639286c3143e93e8ba2c9598dfba640

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