Directory traversal vulnerability in attachmentlibrary.php in the XStandard component for Joomla! 1.5.8 and earlier allows remote attackers to list arbitrary directories via a .. (dot dot) in the X_CMS_LIBRARY_PATH HTTP header.
https://www.exploit-db.com/exploits/7691
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-0122
http://www.securityfocus.com/bid/33143