oss-security - CVE request Qemu: display: cirrus_vga: a divide by zero in cirrus_do

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Date: Thu, 8 Dec 2016 13:02:04 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: liq3ea@...il.com, psirt@...wei.com
Subject: CVE request Qemu: display: cirrus_vga: a divide by zero in
 cirrus_do_copy

   Hello,

Quick emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is 
vulnerable to a divide by zero issue. It could occur while copying VGA data 
when cirrus graphics mode was set to be VGA.

A privileged user inside guest could use this flaw to crash the Qemu process 
instance on the host, resulting in DoS.

Upstream patch
--------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2016-12/msg00442.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1334398

This issue was independently reported by Qinghao Tang, Li Qiang of Qihoo 
360.cn Inc. and PSIRTeam of Huawei Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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