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source: http://www.securityfocus.com/bid/11433/info Yak! Chat Client FTP server is reported prone to a remote directory traversal vulnerability. This issue presents itself due to insufficient sanitization of user-supplied data. This issue can ultimately allow an attacker to compromise a computer by placing malicious files on the system and executing these files through other means. Yak! 2.1.2 and prior versions are reported vulnerable to this issue. dir / dir ../../windows/ put evil.exe ../../windows/calc.exe