USN-1257-1: radvd vulnerabilities

Ubuntu Security Notice USN-1257-1

10th November, 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 version:

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2011-3601, CVE-2011-3602, CVE-2011-3604, CVE-2011-3605