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Ubuntu Security Notice USN-1990-1

Ubuntu Security Notice USN-1990-1
Posted Oct 17, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1990-1 - 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local, root
systems | linux, ubuntu
advisories | CVE-2013-4396, CVE-2013-1056, CVE-2013-1056, CVE-2013-4396
SHA-256 | 20ef9ae65651b3045515f2137dfaa94de9ff70a34ee665c2b80c0fb149236b52

Ubuntu Security Notice USN-1990-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1990-1
October 17, 2013

xorg-server, xorg-server-lts-quantal, xorg-server-lts-raring vulnerabilities
============================================================================

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

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

The X.Org X server could be made to crash or run programs as an
administrator if it received specially crafted input.

Software Description:
- xorg-server: X.Org X11 server
- xorg-server-lts-quantal: X.Org X11 server
- xorg-server-lts-raring: X.Org X11 server

Details:

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)

Update instructions:

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

Ubuntu 13.04:
xserver-xorg-core 2:1.13.3-0ubuntu6.2

Ubuntu 12.10:
xserver-xorg-core 2:1.13.0-0ubuntu6.4

Ubuntu 12.04 LTS:
xserver-xorg-core 2:1.11.4-0ubuntu10.14
xserver-xorg-core-lts-quantal 2:1.13.0-0ubuntu6.1~precise4
xserver-xorg-core-lts-raring 2:1.13.3-0ubuntu6~precise3

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1990-1
CVE-2013-1056, CVE-2013-4396

Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.13.3-0ubuntu6.2
https://launchpad.net/ubuntu/+source/xorg-server/2:1.13.0-0ubuntu6.4
https://launchpad.net/ubuntu/+source/xorg-server/2:1.11.4-0ubuntu10.14

https://launchpad.net/ubuntu/+source/xorg-server-lts-quantal/2:1.13.0-0ubuntu6.1~precise4

https://launchpad.net/ubuntu/+source/xorg-server-lts-raring/2:1.13.3-0ubuntu6~precise3
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