oss-security - CVE request Qemu: ide: divide by zero issue

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Date: Thu, 10 Sep 2015 12:15:32 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Qinghao Tang <luodalongde@...il.com>
Subject: CVE request Qemu: ide: divide by zero issue

   Hello,

Qemu emulator built with the IDE disk and CD/DVD-ROM emulation support is 
vulnerable to a divide by zero issue. It could occur while executing an IDE 
command WIN_READ_NATIVE_MAX to determine the maximum size of a drive.

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

Upstream fix:
-------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg02479.html

The fix disables undue IDE commands for CD-ROM drives.

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

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