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Message-ID: <CAOfWR+FbqxJL-PPAnOPoJ4i3eCBjZv87uhpqtnOha1MCE4orbQ@mail.gmail.com>
Date: Thu, 22 Oct 2015 22:40:29 -0400
From: Robert Watson <robertcwatson1@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request: BusyBox tar directory traversal
Apologies if I'm naive but... since /tmp is world writable, how is this a
vulnerability?
*Trust in truth keeps hope aliverobertcwatson1@...il.com
<robertcwatson1@...il.com>www.docsalvage.info
<http://www.docsalvage.info>www.CivicChorale.org
<http://www.CivicChorale.org>*
<http://www.wunderground.com/cgi-bin/findweather/getForecast?query=Tallahassee,%20FL>
<https://www.healthcare.gov/>
On Wed, Oct 21, 2015 at 11:36 AM, Tyler Hicks <tyhicks@...onical.com> wrote:
> Hello - The BusyBox implementation of tar will extract a symlink that
> points outside of the current working directory and then follow that
> symlink when extracting other files. This allows for a directory
> traversal attack when extracting untrusted tarballs.
>
> This behavior was documented in the BusyBox source with the following
> 2011 commit:
>
>
> http://git.busybox.net/busybox/commit/?id=a116552869db5e7793ae10968eb3c962c69b3d8c
>
> I've created an upstream bug report:
>
> https://bugs.busybox.net/8411
>
> Can we get a CVE assigned to track this? Thanks!
>
> Tyler
>
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