full-disclosure - Re: Symlink vulnerabilities

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Date: Wed, 26 Oct 2011 10:46:19 +1100
From: xD 0x41 <secn3t@...il.com>
To: vladz <vladz@...zero.fr>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Symlink vulnerabilities

Even if bzexe is not used that much, I found similar configurations
(compressed binaries launched via crond) on embedded systems (I think
this is why bzexe was made for).

This is true, your correct , but then, you dont have to even use a
compression agent.. there is still many other holes not even being
discussed.. that will 100% give you root I guess thts why theyre not being
discussed tho eh ;)

You dont even have to go *this* far to gain root...i mean, using some
compression agent, etc etc, and rely on a bug in the binary of a compression
agent, although i have said that there has been MANY bugs in this softwares
for many years now.. in some earlier post, so i am really wondering why this
one is even gone to seclists about it, where there is no proof it gains root
atall.

just a friendly blackhat tip of the hit to you.
cheers.
xd

On 26 October 2011 05:54, vladz <vladz@...zero.fr> wrote:

>
> Hi,
>
> On Tue, Oct 25, 2011 at 12:06:25PM +0200, Tavis Ormandy wrote:
> > xD 0x41 <secn3t@...il.com> wrote:
> > >     Your 'race condition possibly leading to root'is a myth...
> > > Yes thats maybe because race condition or not, it is ASLR wich will
> > > prevent from ANY rootshell,and Yes, it has bveen tried... You can do
> > > better, go right ahed ;-) I am betting you thats why it aint being
> ptached
> > > in any hurry, because obv if you read some notes about it in the
> committs,
> > > you will see they must have reproduced the said bugs, in and with, more
> > > than JUST bzexe even... but anyhow, your PoC is bs.
> >
> > I think you misunderstood, he's not talking about memory corruption, his
> > attack sounds like a legitimate filesystem race. I'll try to explain, the
> > bzexe utility compresses executables and then decompresses them at
> runtime
> > by prepending a decompression stub.
>
> Thank you for explaining him, I thought he was not replying to the good
> thread.
>
> > I think it's quite a nice example, and a nice simple solution. Imagine a
> > system where crond executes a bzexe utility at regular intervals, Vladz'
> > attack will eventually succeed.
>
> Even if bzexe is not used that much, I found similar configurations
> (compressed binaries launched via crond) on embedded systems (I think
> this is why bzexe was made for).
>
> vladz.
>
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