USN-983-1: Sudo vulnerability

7 September 2010

sudo vulnerability

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

  • Ubuntu 10.04 LTS
  • Ubuntu 9.10


Under non-default configurations, a local user could run programs with administrator privileges.

Software Description

  • sudo - Provide limited super user privileges to specific users


Markus Wuethrich discovered that sudo did not always verify the user when a group was specified in the Runas_Spec. A local attacker could exploit this to execute arbitrary code as root if sudo was configured to allow the attacker to use a program as a group when the attacker was not a part of that group.

Update instructions

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

Ubuntu 10.04 LTS
sudo - 1.7.2p1-1ubuntu5.2
sudo-ldap - 1.7.2p1-1ubuntu5.2
Ubuntu 9.10
sudo - 1.7.0-1ubuntu2.5
sudo-ldap - 1.7.0-1ubuntu2.5

To update your system, please follow these instructions:

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