Mandriva Linux Security Advisory – Charles Morris discovered a vulnerability in sudo versions prior to 1.6.8p12 where, when the perl taint flag is off, sudo does not clear the PERLLIB, PERL5LIB, and PERL5OPT environment variables, which could allow limited local users to cause a perl script to include and execute arbitrary library files that have the same name as library files that included by the script.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/42607/MDKSA-2005-234.txt
Source: https://packetstormsecurity.com/files/42607/Mandriva-Linux-Security-Advisory-2005.234.html