The Nullsoft Modern Skins Support module (gen_ff.dll) in Nullsoft Winamp before 5.552 allows remote attackers to execute arbitrary code via a crafted MAKI file, which triggers an incorrect sign extension, and integer overflow, and a stack-based buffer overflow.

More... (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-1831)