USN-1232-2: X.Org X server regression

Releases

• Ubuntu 10.04

Packages

• 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

• 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

• https://launchpad.net/bugs/877905