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Ubuntu Security Notice USN-1108-2

Ubuntu Security Notice USN-1108-2
Posted Apr 19, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1108-2 - USN-1108-1 fixed vulnerabilities in DHCP. Due to an error, the patch to fix the vulnerability was not properly applied on Ubuntu 9.10 and higher. This update fixes the problem. Sebastian Krahmer discovered that the dhclient utility incorrectly filtered crafted responses. An attacker could use this flaw with a malicious DHCP server to execute arbitrary code, resulting in root privilege escalation.

tags | advisory, arbitrary, root, vulnerability
systems | linux, ubuntu
advisories | CVE-2011-0997
SHA-256 | 5304a29b072afd7b22861f6a5bec448d166a9a19548bb7b5f72b687ba16b1705

Ubuntu Security Notice USN-1108-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-1108-2
April 19, 2011

dhcp3 vulnerability
==========================================================================

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

- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 9.10

Summary:

An attacker's DHCP server could send crafted responses to your computer and
cause it to run programs as root.

Software Description:
- dhcp3: DHCP Client

Details:

USN-1108-1 fixed vulnerabilities in DHCP. Due to an error, the patch to fix
the vulnerability was not properly applied on Ubuntu 9.10 and higher. This
update fixes the problem.

Original advisory details:

Sebastian Krahmer discovered that the dhclient utility incorrectly filtered
crafted responses. An attacker could use this flaw with a malicious DHCP
server to execute arbitrary code, resulting in root privilege escalation.

Update instructions:

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

Ubuntu 10.10:
dhcp3-client 3.1.3-2ubuntu6.2

Ubuntu 10.04 LTS:
dhcp3-client 3.1.3-2ubuntu3.2

Ubuntu 9.10:
dhcp3-client 3.1.2-1ubuntu7.3

In general, a standard system update will make all the necessary changes.

References:
CVE-2011-0997

Package Information:
https://launchpad.net/ubuntu/+source/dhcp3/3.1.3-2ubuntu6.2
https://launchpad.net/ubuntu/+source/dhcp3/3.1.3-2ubuntu3.2
https://launchpad.net/ubuntu/+source/dhcp3/3.1.2-1ubuntu7.3


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