oss-security - CVE-2017-18030 Qemu: Out-of-bounds access in cirrus_invalidate

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Message-ID: <nycvar.YSQ.7.76.1801152337380.28933@wniryva>
Date: Mon, 15 Jan 2018 23:40:26 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: jiangxin1@...wei.com
Subject: CVE-2017-18030 Qemu: Out-of-bounds access in cirrus_invalidate_region
 routine

   Hello,

Quick emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is 
vulnerable to an out-of-bounds access issue. It could occur while refreshing 
vnc surface area, in case the initial pitch was negative in 
cirrus_invalidate_region.

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

Upstream patch:
---------------
   -> https://git.qemu.org/?p=qemu.git;a=commitdiff;h=f153b563f8cf121aebf5a2fff5f0110faf58ccb3

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

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