#VU33855 Input validation error in Pixman - CVE-2013-6425

Vulnerability identifier: #VU33855

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-6425

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Pixman
Universal components / Libraries / Libraries used by multiple products

Vendor: Pixman

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Pixman: 0.9.6 - 0.30.2

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External links
https://cgit.freedesktop.org/pixman/commit/?id=5e14da97f16e421d084a9e735be21b1025150f0c
https://lists.freedesktop.org/archives/pixman/2013-November/003109.html
https://lists.opensuse.org/opensuse-updates/2014-01/msg00001.html
https://lists.opensuse.org/opensuse-updates/2014-01/msg00005.html
https://lists.opensuse.org/opensuse-updates/2014-01/msg00008.html
https://lists.opensuse.org/opensuse-updates/2014-01/msg00097.html
https://rhn.redhat.com/errata/RHSA-2013-1869.html
https://www.debian.org/security/2013/dsa-2823
https://www.openwall.com/lists/oss-security/2013/12/03/8
https://www.openwall.com/lists/oss-security/2013/12/04/8
https://www.ubuntu.com/usn/USN-2047-1
https://bugs.freedesktop.org/show_bug.cgi?id=67484
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1197921

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.