Vulnerability CVE-2013-6425
Published: 2014-01-18   Modified: 2014-01-19

Description:
Integer underflow in the pixman_trapezoid_valid macro in pixman.h in Pixman before 0.32.0, as used in X.Org server and cairo, allows context-dependent attackers to cause a denial of service (crash) via a negative bottom value.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
pixman (X.org server) Integer Overflow
Ritesh Khadgaray...
19.01.2014

Type:

CWE-189

 (Numeric Errors)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
X -> X server 
Pixman -> Pixman 
Canonical -> Ubuntu linux 
Cairographics -> Cairo 

 References:
http://lists.freedesktop.org/archives/pixman/2013-November/003109.html
http://cgit.freedesktop.org/pixman/commit/?id=5e14da97f16e421d084a9e735be21b1025150f0c
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1197921
https://bugs.freedesktop.org/show_bug.cgi?id=67484
http://www.ubuntu.com/usn/USN-2047-1
http://www.openwall.com/lists/oss-security/2013/12/04/8
http://www.openwall.com/lists/oss-security/2013/12/03/8
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