full-disclosure - Re: Microsoft Windows Live Messenger Live Call Local Privilege Escalation Vulnerability

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Date: Sun, 19 Aug 2007 20:36:21 +0200
From: monikerd <monikerd@...il.com>
To: David Maciejak <david.maciejak@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Microsoft Windows Live Messenger Live Call
 Local	Privilege Escalation Vulnerability

David Maciejak wrote:
> Hi,
>
> Playing around with privilege escalation I found that WLM 8.0, 8.1 and
> probably newer (since live call feature in fact) are vulnerable to a local
> privilege escalation issue. It's not a critical flaw.
> The problem occurs when livecall.exe process is launch.
> The first time, the user need to click on phone icon after that each time
> it connect back on WLM the livecall.exe process is autolaunch.
> Quotes must be missing when this process is launch through svchost.exe
> because it tries first to launch Program.exe file at root default windows drive.
> Then, to exploit this issue the malicious user need to have enough write
> permission on default root path and wait for a more privilege user to
> connect to the local WLM.
>
>   
Wow, you might need to take the time to put that sequence of words into
sentences. Using punctuation, capital letters, and structure:-)

Basically what I analyze, is that if you have the rights to replace a file
with an *evil* exe it would get executed by somebody else.

The real issue is, if there is in fact a privilege mismatch?

> I have contacted Microsoft Security Team about that on July 11 2007,
> for them "this does not appear to be a security vulnerability". I
> don't think a patch will be addressed soon.
>
> cheers,
> David Maciejak
>
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