full-disclosure - Re: OS X Local Root Exploit for Viscosity OpenVPN Client

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Message-ID: <CAHmME9qvD9durm7iRZUcGRu4xH0aBpyTktZNr9cezm_8uFWg6w@mail.gmail.com>
Date: Mon, 13 Aug 2012 17:55:31 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Richard Miles <richard.k.miles@...glemail.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: OS X Local Root Exploit for Viscosity OpenVPN
	Client

On Mon, Aug 13, 2012 at 5:41 PM, Richard Miles
<richard.k.miles@...glemail.com> wrote:
> - Calls a file with a suid file without full path?

No.

> - Allows to create a symbolic link inside
> /Applications/Viscosity.app/Contents/Resources/ with the name of
> ViscosityHelper?

No.

>
> BTW, this file
> /Applications/Viscosity.app/Contents/Resources/ViscosityHelper doesn't exist
> by default?

Yes, it does exist. When you run Viscosity for the first time, it
makes that file SUID.

> Also, are the permission at the folder
> /Applications/Viscosity.app/Contents/Resources/ week enough to allows anyone
> to write on it?

I don't know. It doesn't matter for this exploit.

> Sorry for dumb question, but what is the real issue here?

The SUID binary will execute python code from the directory of the
executable, linked, symlinked, or otherwise. Take a look at the
exploit.

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