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

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Date: Sun, 19 Aug 2007 22:45:21 +0200
From: "David Maciejak" <david.maciejak@...il.com>
To: monikerd <monikerd@...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:-)

Sorry I write it too quickly :)

> 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?

As you said any program can be execute just by writing it as Program.exe.

david maciejak

>
> > 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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>

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