encoder.php in eAccelerator allows remote attackers to execute arbitrary code by copying a local executable file to a location under the web root via the -o option, and then making a direct request to this file, related to upload of image files.
http://www.securityfocus.com/archive/1/504695/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDVSA-2009:188