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USN-1257-1: radvd vulnerabilities

10 November 2011

radvd could be made to crash or overwrite certain files if it received specially crafted network traffic.

Releases

Packages

  • radvd - Router Advertisement Daemon

Details

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.
(CVE-2011-3602)

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
service. (CVE-2011-3605)

Update instructions

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

Ubuntu 11.10
Ubuntu 11.04
Ubuntu 10.10
Ubuntu 10.04

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