Untrusted search path vulnerability in DiskMountNotify for Symantec Norton AntiVirus 9.0.3 allows local users to gain privileges by modifying the PATH to reference a malicious (1) ps or (2) grep file.
http://www.securityfocus.com/bid/15143
http://www.securityfocus.com/bid/15142
http://www.idefense.com/application/poi/display?id=325&type=vulnerabilities