Symantec LiveUpdate 1.5 and earlier in Norton Antivirus stores usernames and passwords for a local LiveUpdate server in cleartext in the registry, which may allow remote attackers to impersonate the LiveUpdate server.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-0341
http://www.securityfocus.com/bid/4170
http://www.iss.net/security_center/static/8282.php