full-disclosure - Re: Symlink vulnerabilities

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Message-ID: <18852.1319724319@turing-police.cc.vt.edu>
Date: Thu, 27 Oct 2011 10:05:19 -0400
From: Valdis.Kletnieks@...edu
To: secn3t@...il.com
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Symlink vulnerabilities

On Fri, 28 Oct 2011 00:56:35 +1100, xD 0x41 said:

> morning but, i trust you, itcannot be exploited, in any way, it will
> only cause corruption of tar and compression utils, at most.

Umm. Maybe in *that step* it's "at most". But what can you leverage
that into?

If you can screw with the code execution of the tar command
enough to get root to untar a file of your choosing, you then have your
entire rootkit installed with no further effort on your part. ;)

(For a wonderful read on leveraging, find the tech writeup from a few years
ago on how a 1-byte overlay in ntpd got leveraged into a total root pwn.)

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