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USN-1046-1: Sudo vulnerability

20 January 2011

Under certain circumstances, sudo could be made to run programs without a password.



  • sudo - Provide limited super user privileges to specific users


Alexander Kurtz discovered that sudo would not prompt for a password when
a group was specified in the Runas_Spec. A local attacker could exploit
this to execute arbitrary code as the specified group if sudo was
configured to allow the attacker to use a program as this group. The group
Runas_Spec is 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 9.10
Ubuntu 10.10
Ubuntu 10.04

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