Ubuntu 12.04 LTS / 12.10 / 13.04 : xorg-server, xorg-server-lts-quantal, xorg-server-lts-raring vulnerabilities (USN-1990-1)

medium Nessus Plugin ID 70492
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VPR Score: 5.9


The remote Ubuntu host is missing one or more security-related patches.


Pedro Ribeiro discovered that the X.Org X server incorrectly handled memory operations when handling ImageText requests. An attacker could use this issue to cause X.Org to crash, or to possibly execute arbitrary code. (CVE-2013-4396)

It was discovered that non-root X.Org X servers such as Xephyr incorrectly used cached xkb files. A local attacker could use this flaw to cause a xkb cache file to be loaded by another user, resulting in a denial of service. (CVE-2013-1056).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected xserver-xorg-core, xserver-xorg-core-lts-quantal and / or xserver-xorg-core-lts-raring packages.

See Also


Plugin Details

Severity: Medium

ID: 70492

File Name: ubuntu_USN-1990-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 10/18/2013

Updated: 9/19/2019

Dependencies: ssh_get_info.nasl

Risk Information

Risk Factor: Medium

VPR Score: 5.9

CVSS v2.0

Base Score: 6.5

Temporal Score: 4.8

Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core, p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-lts-quantal, p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-lts-raring, cpe:/o:canonical:ubuntu_linux:12.04:-:lts, cpe:/o:canonical:ubuntu_linux:12.10, cpe:/o:canonical:ubuntu_linux:13.04

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 10/17/2013

Vulnerability Publication Date: 10/10/2013

Reference Information

CVE: CVE-2013-1056, CVE-2013-4396

BID: 62892

USN: 1990-1