星球 - USN-1108-2: DHCP vulnerability
Ubuntu Security Notice USN-1108-2
19th April, 2011
A security issue affects these releases of Ubuntu and its
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 9.10
An attacker's DHCP server could send crafted responses to your computer and
cause it to run programs as root.
- DHCP Client
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.
The problem can be corrected by updating your system to the following
- Ubuntu 10.10:
- Ubuntu 10.04 LTS:
- Ubuntu 9.10:
In general, a standard system update will make all the necessary changes.