USN-1442-1: Sudo vulnerability

16 May 2012

sudo vulnerability

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


Sudo could allow users to run arbitrary programs as the administrator.

Software Description

  • sudo - Provide limited super user privileges to specific users


It was discovered that sudo incorrectly handled network masks when using Host and Host_List. A local user who is listed in sudoers may be allowed to run commands on unintended hosts when IPv4 network masks are used to grant access. A local attacker could exploit this to bypass intended access restrictions. Host and Host_List are not used in the default installation of Ubuntu.

Update instructions

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

Ubuntu 12.04 LTS
sudo - 1.8.3p1-1ubuntu3.2
sudo-ldap - 1.8.3p1-1ubuntu3.2
Ubuntu 11.10
sudo - 1.7.4p6-1ubuntu2.1
sudo-ldap - 1.7.4p6-1ubuntu2.1
Ubuntu 11.04
sudo - 1.7.4p4-5ubuntu7.2
sudo-ldap - 1.7.4p4-5ubuntu7.2
Ubuntu 10.04 LTS
sudo - 1.7.2p1-1ubuntu5.4
sudo-ldap - 1.7.2p1-1ubuntu5.4
Ubuntu 8.04 LTS
sudo - 1.6.9p10-1ubuntu3.9
sudo-ldap - 1.6.9p10-1ubuntu3.9

To update your system, please follow these instructions:

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