Directory traversal vulnerability in the pnModFunc function in pnMod.php for PostNuke 0.750 through 0.760rc4 allows remote attackers to read arbitrary files via a .. (dot dot) in the func parameter to index.php.
http://www.vupen.com/english/advisories/2005/0553
http://news.postnuke.com/modules.php?op=modload&name=News&file=article&sid=2691
http://news.postnuke.com/Article2690.html