Directory traversal vulnerability in the (1) rmdir or (2) mkdir commands in upload.php in YaPiG 0.92b, 0.93u and 0.94u allows remote attackers to create or delete arbitrary directories via a .. (dot dot) in the dir parameter.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1886
http://www.securityfocus.com/bid/13877
http://secwatch.org/advisories/secwatch/20050530_yapig.txt