U radu programskih paketa dhcp3 i isc-dhcp uočena su dva sigurnosna propusta. Zlonamjerni, lokalni korisnik ih može iskoristiti za izvođenje DoS napada.

==========================================================================
Ubuntu Security Notice USN-1190-1
August 15, 2011

dhcp3, isc-dhcp vulnerabilities
==========================================================================

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

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

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.

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.

References:
  http://www.ubuntu.com/usn/usn-1190-1
  CVE-2011-2748, CVE-2011-2749

Package Information:
  https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-15ubuntu9.1
  https://launchpad.net/ubuntu/+source/dhcp3/3.1.3-2ubuntu6.3
  https://launchpad.net/ubuntu/+source/dhcp3/3.1.3-2ubuntu3.3
  https://launchpad.net/ubuntu/+source/dhcp3/3.0.6.dfsg-1ubuntu9.3