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Bug 1334398 - (CVE-2016-9921, CVE-2016-9922) CVE-2016-9922 Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy
CVE-2016-9922 Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20161018,reported=2...
: Security
Depends On: 1399054 1399055 1476049 1476068 1476069 1476072 1476074 1476077
Blocks: 1327232 1476084
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Reported: 2016-05-09 09:58 EDT by Adam Mariš
Modified: 2018-07-18 10:53 EDT (History)
39 users (show)

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Doc Type: Bug Fix
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2392 normal SHIPPED_LIVE Important: qemu-kvm-rhev security, bug fix, and enhancement update 2017-08-01 16:04:36 EDT
Red Hat Product Errata RHSA-2017:2408 normal SHIPPED_LIVE Moderate: qemu-kvm-rhev security and bug fix update 2017-08-01 21:17:55 EDT

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Description Adam Mariš 2016-05-09 09:58:21 EDT 
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
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  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg03968.html

Reference:
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  -> http://www.openwall.com/lists/oss-security/2016/12/08/9
Comment 1 Adam Mariš 2016-05-09 09:58:37 EDT 
Acknowledgments:

Name: Qinghao Tang (Qihoo 360), Li Qiang (Qihoo 360), Jiangxin (Huawei Inc.)
Comment 3 Prasad J Pandit 2016-11-28 02:51:20 EST 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1399055]
Comment 4 Prasad J Pandit 2016-11-28 02:51:37 EST 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1399054]
Comment 7 Cole Robinson 2017-01-16 13:39:20 EST 
commit 4299b90e9ba9ce5ca9024572804ba751aa1a7e70
Author: Prasad J Pandit <pjp@fedoraproject.org>
Date:   Tue Oct 18 13:15:17 2016 +0530

    display: cirrus: check vga bits per pixel(bpp) value
Comment 9 errata-xmlrpc 2017-08-01 20:55:56 EDT 
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 00:44:32 EDT 
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
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