USN-1155-1: NBD vulnerability

21 June 2011

nbd vulnerability

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


An attacker could send crafted input to NBD and cause it to crash or to run arbitrary programs.

Software Description

  • nbd - Network Block Device protocol


It was discovered that NBD incorrectly handled certain long requests. A remote attacker could use this flaw to cause NBD to crash, resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 10.10
nbd-server - 1:2.9.14-2ubuntu1.10.10.1
Ubuntu 10.04 LTS
nbd-server - 1:2.9.14-2ubuntu1.10.04.1
Ubuntu 8.04 LTS
nbd-server - 1:2.9.9-1ubuntu1.1

To update your system, please follow these instructions:

After a standard system update you need to restart NBD to make all the necessary changes.