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[USN-1309-1] DHCP vulnerability

Posted on 15 December 2011
Ubuntu Security

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Ubuntu Security Notice USN-1309-1
December 15, 2011

isc-dhcp vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04

Summary:

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

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

Details:

It was discovered that the DHCP server incorrectly handled certain
malformed packets when configured to evaluate regular expressions. A remote
attacker could use this issue to cause DHCP to crash, resulting in a denial
of service.

Update instructions:

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

Ubuntu 11.10:
isc-dhcp-server 4.1.1-P1-17ubuntu10.1

Ubuntu 11.04:
isc-dhcp-server 4.1.1-P1-15ubuntu9.3

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

References:
http://www.ubuntu.com/usn/usn-1309-1
CVE-2011-4539

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-17ubuntu10.1
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-15ubuntu9.3

 

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