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Ubuntu Security Notice USN-1571-1

Ubuntu Security Notice USN-1571-1
Posted Sep 19, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1571-1 - Glen Eustace discovered that the DHCP server incorrectly handled IPv6 expiration times. A remote attacker could use this issue to cause DHCP to crash, resulting in a denial of service. This issue only affected Ubuntu 11.04, Ubuntu 11.10 and Ubuntu 12.04 LTS. Dan Rosenberg discovered that the DHCP AppArmor profile could be escaped by using environment variables. This update mitigates the issue by sanitizing certain variables in the DHCP shell scripts. Various other issues were also addressed.

tags | advisory, remote, denial of service, shell
systems | linux, ubuntu
advisories | CVE-2012-3955, CVE-2012-3955
MD5 | 0e015a66b20705a9579a71499c6ea5ea

Ubuntu Security Notice USN-1571-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1571-1
September 18, 2012

dhcp3, isc-dhcp vulnerability
============================================================================

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

DHCP could be made to crash if it received specially crafted network
traffic.

Software Description:
- isc-dhcp: DHCP server and client
- dhcp3: DHCP server and client

Details:

Glen Eustace discovered that the DHCP server incorrectly handled IPv6
expiration times. A remote attacker could use this issue to cause DHCP to
crash, resulting in a denial of service. This issue only affected Ubuntu
11.04, Ubuntu 11.10 and Ubuntu 12.04 LTS. (CVE-2012-3955)

Dan Rosenberg discovered that the DHCP AppArmor profile could be escaped by
using environment variables. This update mitigates the issue by sanitizing
certain variables in the DHCP shell scripts.

Update instructions:

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

Ubuntu 12.04 LTS:
isc-dhcp-client 4.1.ESV-R4-0ubuntu5.5
isc-dhcp-server 4.1.ESV-R4-0ubuntu5.5

Ubuntu 11.10:
isc-dhcp-client 4.1.1-P1-17ubuntu10.5
isc-dhcp-server 4.1.1-P1-17ubuntu10.5

Ubuntu 11.04:
isc-dhcp-client 4.1.1-P1-15ubuntu9.6
isc-dhcp-server 4.1.1-P1-15ubuntu9.6

Ubuntu 10.04 LTS:
dhcp3-client 3.1.3-2ubuntu3.4
dhcp3-server 3.1.3-2ubuntu3.4

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

References:
http://www.ubuntu.com/usn/usn-1571-1
CVE-2012-3955, https://launchpad.net/bugs/1016643

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.ESV-R4-0ubuntu5.5
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-17ubuntu10.5
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-15ubuntu9.6
https://launchpad.net/ubuntu/+source/dhcp3/3.1.3-2ubuntu3.4

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