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Ubuntu Security Notice USN-1232-2

Ubuntu Security Notice USN-1232-2
Posted Oct 19, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1232-2 - USN-1232-1 fixed vulnerabilities in the X.Org X server. A regression was found on Ubuntu 10.04 LTS that affected GLX support. This update temporarily disables the fix for CVE-2010-4818 that introduced the regression.

tags | advisory, vulnerability
systems | linux, ubuntu
SHA-256 | 5502fbdbb0fed96f08a70ba5f6600455a027ada81be5373f73f0064996e51f42

Ubuntu Security Notice USN-1232-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-1232-2
October 19, 2011

xorg-server regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.04 LTS

Summary:

USN-1232-1 caused a regression with GLX support.

Software Description:
- xorg-server: X.Org X server

Details:

USN-1232-1 fixed vulnerabilities in the X.Org X server. A regression was
found on Ubuntu 10.04 LTS that affected GLX support.

This update temporarily disables the fix for CVE-2010-4818 that introduced
the regression.

We apologize for the inconvenience.

Original advisory details:

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 10.04 LTS:
xserver-xorg-core 2:1.7.6-2ubuntu7.9

After a standard system update you need to restart your session to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1232-2
http://www.ubuntu.com/usn/usn-1232-1
https://launchpad.net/bugs/877905

Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.9


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