App Store in Apple Mac OS X before 10.6.8 creates a log entry containing a user's AppleID password, which might allow local users to obtain sensitive information by reading a log file, as demonstrated by a log file that has non-default permissions.
http://www.securityfocus.com/bid/48443
http://support.apple.com/kb/HT4723
http://lists.apple.com/archives/security-announce/2011//Jun/msg00000.html