The scheduler in CUPS in Apple Mac OS X 10.5 before 10.5.3, when debug logging is enabled and a printer requires a password, allows attackers to obtain sensitive information (credentials) by reading the log data, related to "authentication environment variables."
https://exchange.xforce.ibmcloud.com/vulnerabilities/42713
http://www.vupen.com/english/advisories/2008/1697
http://www.us-cert.gov/cas/techalerts/TA08-150A.html
http://www.securityfocus.com/bid/29484
http://www.securityfocus.com/bid/29412
http://securitytracker.com/id?1020145
http://secunia.com/advisories/30430
http://lists.apple.com/archives/security-announce/2008//May/msg00001.html