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Date: Tue,  8 Dec 2015 13:36:37 -0500 (EST)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, lianyihan@....cn
Subject: Re: CVE request: Qemu: ui: vnc: avoid floating point exception

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> Qemu emulator built with the VNC display driver support is vulnerable to an
> arithmetic exception flaw. It occurs on the VNC server side while processing
> the 'SetPixleFormat' messages from a client.

We think SetPixleFormat is a typo of SetPixelFormat.

> A privileged remote client could use this flaw to crash the guest resulting in
> DoS.

> http://git.qemu.org/?p=qemu.git;a=commit;h=4c65fed8bdf96780735dbdb92a8bd0d6b6526cc3
> 
> ui: vnc: avoid floating point exception
> 
> While sending 'SetPixelFormat' messages to a VNC server,
> the client could set the 'red-max', 'green-max' and 'blue-max'
> values to be zero. This leads to a floating point exception in
> write_png_palette while doing frame buffer updates.
> 
> ui/vnc.c
> set_pixel_format

Use CVE-2015-8504.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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