Directory traversal vulnerability in unb_lib/abbc.conf.php in Unclassified NewsBoard (UNB) 1.6.1 patch 1 and earlier, when register_globals is enabled, allows remote attackers to include arbitrary files via .. (dot dot) sequences and a trailing null byte (%00) in the ABBC[Config][smileset] parameter to unb_lib/abbc.css.php.