full-disclosure - Re: GNU tar directory traversal

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Message-ID: <456419F7.9010204@p6drad-teel.net>
Date: Wed, 22 Nov 2006 11:35:51 +0200
From: Siim Põder <windo@...rad-teel.net>
To: Jeb Osama <mkmaxx@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: GNU tar directory traversal

Yo!

Jeb Osama wrote:
> LOLOLOLOLOLOLOLOLOL Thats pretty much the purpose of symlinks.. Whats
> your point in posting this fact in FD?

And is tar supposed to overwrite arbitrary files on the filesystem when
untaring an archieve?

If I understand Teemu right, then he's found a way to create a tar file
that would create a symlink when untared; and create further files to
wherever the symlink points to (If this is not the case, then
LOLOLOLOLOLOL might be in order).

So, for example, I make a tar archieve that contains a symlink to
'bla'->'/etc' and 'bla/passwd', that - if opened by root - would
overwrite the passwd file.

Discussing wether root should ever run tar is irrelevant.

Siim Põder

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