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Bug 1157641 - (CVE-2014-7815) CVE-2014-7815 qemu: vnc: insufficient bits_per_pixel from the client sanitization
CVE-2014-7815 qemu: vnc: insufficient bits_per_pixel from the client sanitiza...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20141027,repor...
: Security
Depends On: 1157644 1157645 1157646 1157647
Blocks: 1156529
  Show dependency tree / graph
 
Reported: 2014-10-27 08:13 EDT by Petr Matousek
Modified: 2015-09-18 07:58 EDT (History)
23 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An uninitialized data structure use flaw was found in the way the set_pixel_format() function sanitized the value of bits_per_pixel. An attacker able to access a guest's VNC console could use this flaw to crash the guest.
Story Points: ---
Clone Of:
Environment:
Last Closed: 2015-09-18 07:58:30 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0349 normal SHIPPED_LIVE Important: qemu-kvm security, bug fix, and enhancement update 2015-03-05 07:27:34 EST
Red Hat Product Errata RHSA-2015:0624 normal SHIPPED_LIVE Important: qemu-kvm-rhev security, bug fix, and enhancement update 2015-03-05 09:37:36 EST

  None (edit)
Description Petr Matousek 2014-10-27 08:13:15 EDT 
bits_per_pixel that are less than 8 could result in accessing
non-initialized buffers later in the code due to the expectation
that bytes_per_pixel value that is used to initialize these buffers is
never zero.

An attacker having access to the guest's VNC console could use this
flaw to crash the guest.

Acknowledgements:

Red Hat would like to thank James Spadaro of Cisco for reporting this issue.
Comment 1 Petr Matousek 2014-10-27 08:15:21 EDT 
Upstream patch submission:

http://lists.gnu.org/archive/html/qemu-devel/2014-10/msg03210.html
Comment 2 Petr Matousek 2014-10-27 08:16:13 EDT 
Statement:

This issue did not affect the kvm package as shipped with Red Hat Enterprise
Linux 5. Future qemu-kvm updates for Red Hat Enterprise Linux 6 and 7 may address this issue.
Comment 5 Petr Matousek 2014-10-27 08:17:54 EDT 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1157647]
Comment 6 Gerd Hoffmann 2014-11-03 03:01:52 EST 
upstream commit e6908bfe8e07f2b452e78e677da1b45b1c0f6829
Comment 9 Fedora Update System 2014-11-10 01:22:17 EST 
qemu-2.1.2-6.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2014-11-10 01:48:02 EST 
qemu-1.6.2-10.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 11 errata-xmlrpc 2015-03-05 03:12:57 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0349 https://rhn.redhat.com/errata/RHSA-2015-0349.html
Comment 12 errata-xmlrpc 2015-03-05 04:56:58 EST 
This issue has been addressed in the following products:

  RHEV-H and Agents for RHEL-7

Via RHSA-2015:0624 https://rhn.redhat.com/errata/RHSA-2015-0624.html
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