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[USN-1232-3] X.Org X server vulnerability

Posted on 21 October 2011
Ubuntu Security

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Ubuntu Security Notice USN-1232-3
October 20, 2011

xorg-server vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

The X server could be made to crash or run programs as an administrator.

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, 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.

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)
=20
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 fro=
m
the X server process. This issue only affected Ubuntu 10.04 LTS.
(CVE-2010-4819)
=20
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)
=20
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 10.10:
xserver-xorg-core 2:1.9.0-0ubuntu7.6

Ubuntu 10.04 LTS:
xserver-xorg-core 2:1.7.6-2ubuntu7.10

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

References:
http://www.ubuntu.com/usn/usn-1232-3
http://www.ubuntu.com/usn/usn-1232-1
CVE-2010-4818

Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.9.0-0ubuntu7.6
https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.10

 

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