Ubuntu 10.04 LTS / 10.10 : xorg-server vulnerability (USN-1232-3)

Ubuntu Security Notice (C) 2011-2013 Canonical, Inc. / NASL script (C) 2011-2013 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

USN-1232-1 fixed vulnerabilities in the X.Org X server. A regression
was found on Ubuntu 10.04 LTS that affected GLX support, and
USN-1232-2 was released to temporarily disable the problematic
security fix. This update includes a revised fix for CVE-2010-4818.

We apologize for the inconvenience.

It was discovered that the X server incorrectly handled certain
malformed input. An authorized attacker could exploit this to cause
the X server to crash, leading to a denial or service, or possibly
execute arbitrary code with root privileges. This issue only affected
Ubuntu 10.04 LTS and 10.10. (CVE-2010-4818)

It was discovered that the X server incorrectly handled
certain malformed input. An authorized attacker could
exploit this to cause the X server to crash, leading to a
denial or service, or possibly read arbitrary data from the
X server process. This issue only affected Ubuntu 10.04 LTS.
(CVE-2010-4819)

Vladz discovered that the X server incorrectly handled lock
files. A local attacker could use this flaw to determine if
a file existed or not. (CVE-2011-4028)

Vladz discovered that the X server incorrectly handled
setting lock file permissions. A local attacker could use
this flaw to gain read permissions on arbitrary files and
view sensitive information. (CVE-2011-4029).

Solution :

Update the affected xserver-xorg-core package.

Risk factor :

High / CVSS Base Score : 8.5
(CVSS2#AV:N/AC:M/Au:S/C:C/I:C/A:C)
CVSS Temporal Score : 6.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 56580 ()

Bugtraq ID: 50002

CVE ID: CVE-2010-4818
CVE-2010-4819
CVE-2011-4028
CVE-2011-4029