Untrusted search path vulnerability in Nullsoft Winamp 5.581, and probably other versions, allows local users, and possibly remote attackers, to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse wnaspi32.dll that is located in the same folder as a .669, .aac, .aiff, .amf, .au, .avr, .b4s, .caf or .cda file.