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Bug 1334398 (CVE-2016-9921, CVE-2016-9922)

Summary:	CVE-2016-9921 CVE-2016-9922 Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abaron, ailan, alonbl, apevec, areis, chrisw, crobinso, cvsbot-xmlrpc, drjones, imammedo, jen, jjoyce, jschluet, kbasil, knoel, lhh, lpeer, markmc, mkenneth, mrezanin, mst, pbonzini, ppandit, rbryant, rkrcmar, sclewis, security-response-team, srevivo, tdecacqu, virt-maint, vkuznets, ykaul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:51:28 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1399054, 1399055, 1476049, 1476068, 1476069, 1476072, 1476074, 1476077
Bug Blocks:

Description Adam Mariš 2016-05-09 13:58:21 UTC

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/2016-10/msg03968.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2016/12/08/9

Comment 1 Adam Mariš 2016-05-09 13:58:37 UTC

Acknowledgments:

Name: Qinghao Tang (Qihoo 360), Li Qiang (Qihoo 360), Jiangxin (Huawei Inc.)

Comment 3 Prasad Pandit 2016-11-28 07:51:20 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1399055]

Comment 4 Prasad Pandit 2016-11-28 07:51:37 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1399054]

Comment 7 Cole Robinson 2017-01-16 18:39:20 UTC

commit 4299b90e9ba9ce5ca9024572804ba751aa1a7e70
Author: Prasad J Pandit <pjp>
Date:   Tue Oct 18 13:15:17 2016 +0530

    display: cirrus: check vga bits per pixel(bpp) value

Comment 9 errata-xmlrpc 2017-08-02 00:55:56 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 10.0 (Newton)
  Red Hat OpenStack Platform 11.0 (Ocata)
  Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7
  Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7
  Red Hat OpenStack Platform 8.0 (Liberty)
  Red Hat OpenStack Platform 9.0 (Mitaka)

Via RHSA-2017:2408 https://access.redhat.com/errata/RHSA-2017:2408

Comment 10 errata-xmlrpc 2017-08-02 04:44:32 UTC

This issue has been addressed in the following products:

  RHEV 4.X RHEV-H and Agents for RHEL-7

Via RHSA-2017:2392 https://access.redhat.com/errata/RHSA-2017:2392