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USN-28-1: sudo vulnerability

18 November 2004

sudo vulnerability

Releases

Details

Liam Helmer discovered an input validation flaw in sudo. When the
standard shell "bash" starts up, it searches the environment for
variables with a value beginning with "()". For each of these
variables a function with the same name is created, with the function
body filled in from the environment variable's value.

A malicious user with sudo access to a shell script that uses bash can
use this feature to substitute arbitrary commands for any
non-fully-qualified programs called from the script. Therefore this
flaw can lead to privilege escalation.

Update instructions

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

Ubuntu 4.10
  • sudo -

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