Ubuntu 11.04 Security Advisory: USN-1190-1 High isc-dhcp DoS

ubuntu

August 15, 2011

An attacker could send crafted input to DHCP and cause it to crash.

Summary

An attacker could send crafted input to DHCP and cause it to crash.

Software Description:

- isc-dhcp: DHCP server and client

- dhcp3: DHCP server and client

Details:

David Zych discovered that DHCP incorrectly handled certain malformed

packets. A remote attacker could use this issue to cause DHCP to crash,

resulting in a denial of service.

Topics Covered

security advisory denial of service Ubuntu high isc-dhcp

Update Instructions

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

Ubuntu 11.04:
  isc-dhcp-server                 4.1.1-P1-15ubuntu9.1

Ubuntu 10.10:
  dhcp3-server                    3.1.3-2ubuntu6.3

Ubuntu 10.04 LTS:
  dhcp3-server                    3.1.3-2ubuntu3.3

Ubuntu 8.04 LTS:
  dhcp3-server                    3.0.6.dfsg-1ubuntu9.3

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