Apache HTTP Server, when running on Linux with a document root on a Windows share mounted using smbfs, allows remote attackers to obtain unprocessed content such as source files for .php programs via a trailing "\" (backslash), which is not handled by the intended AddType directive.
https://exchange.xforce.ibmcloud.com/vulnerabilities/39158
http://www.securityfocus.com/bid/26939
http://www.securityfocus.com/archive/1/485316/100/0/threaded