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

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Message-ID: <00fe01d25129$88fc70c0$9af55240$@com>
Date: Thu, 8 Dec 2016 16:03:16 +0800
From: Huawei PSIRT <psirt@...wei.com>
To: <ppandit@...hat.com>, <oss-security@...ts.openwall.com>
CC: <liq3ea@...il.com>, <jiangxin1@...wei.com>,
        Huawei PSIRT
	<PSIRT@...wei.com>,
        "Wanglijun (PSIRT)" <wanglijun.wanglijun@...wei.com>
Subject: Re: CVE request Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy

Dear,

Could you please change the reporter information from PSIRTeam of Huawei Inc
to Jiangxin <jiangxin1@...wei.com> of Huawei Inc. Thank you.

Best regards,
Huawei PSIRT

-----邮件原件-----
发件人: P J P [mailto:ppandit@...hat.com] 
发送时间: 2016年12月8日 15:32
收件人: oss security list
抄送: liq3ea@...il.com; psirt@...wei.com
主题: 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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