oss-security - CVE-2017-7718 Qemu: display: cirrus: OOB read access issue

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Date: Wed, 19 Apr 2017 15:15:24 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Jiangxin <jiangxin1@...wei.com>
Subject: CVE-2017-7718 Qemu: display: cirrus: OOB read access issue

   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 copying VGA 
data via bitblt functions cirrus_bitblt_rop_fwd_transp_ and/or 
cirrus_bitblt_rop_fwd_.

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

Upstream patch
--------------
   -> http://git.qemu-project.org/?p=qemu.git;a=commitdiff;h=215902d7b6fb50c6fc216fc74f770858278ed904

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1443441

This issue was reported by Jiangxin of PSIRT Huawei Inc.

'CVE-2017-7718' assigned via -> http://cveform.mitre.org/

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

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