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Ubuntu Security Notice USN-1257-1
November 10, 2011

radvd vulnerabilities
==========================================================================

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

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

Software Description:
- 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:
  radvd                           1:1.8-1ubuntu0.1

Ubuntu 11.04:
  radvd                           1:1.7-1ubuntu0.1

Ubuntu 10.10:
  radvd                           1:1.6-1ubuntu0.1

Ubuntu 10.04 LTS:
  radvd                           1:1.3-1.1ubuntu0.1

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

References:
  http://www.ubuntu.com/usn/usn-1257-1
  CVE-2011-3601, CVE-2011-3602, CVE-2011-3604, CVE-2011-3605

Package Information:
  https://launchpad.net/ubuntu/+source/radvd/1:1.8-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/radvd/1:1.7-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/radvd/1:1.6-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/radvd/1:1.3-1.1ubuntu0.1