Ubuntu Security Notice USN-1257-1
November 10, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
radvd could be made to crash or overwrite certain files if it received
specially crafted network traffic.
- radvd: Router Advertisement Daemon
Vasiliy Kulikov discovered that radvd incorrectly parsed the
ND_OPT_DNSSL_INFORMATION option. A remote attacker could exploit this with
a specially-crafted request and cause the radvd daemon to crash, or
possibly execute arbitrary code. The default compiler options for affected
releases should reduce the vulnerability to a denial of service. This issue
only affected Ubuntu 11.04 and 11.10. (CVE-2011-3601)
Vasiliy Kulikov discovered that radvd incorrectly filtered interface names
when creating certain files. A local attacker could exploit this to
overwrite certain files on the system, bypassing intended permissions.
Vasiliy Kulikov discovered that radvd incorrectly handled certain lengths.
A remote attacker could exploit this to cause the radvd daemon to crash,
resulting in a denial of service. (CVE-2011-3604)
Vasiliy Kulikov discovered that radvd incorrectly handled delays when used
in unicast mode, which is not the default in Ubuntu. If used in unicast
mode, a remote attacker could cause radvd outages, resulting in a denial of
The problem can be corrected by updating your system to the following
Ubuntu 10.04 LTS:
In general, a standard system update will make all the necessary changes.
CVE-2011-3601, CVE-2011-3602, CVE-2011-3604, CVE-2011-3605