full-disclosure - Re: The GNU C library dynamic linker expands $ORIGIN in setuid library search path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <mpro.lal64j0l71kbk02af.taviso@cmpxchg8b.com>
Date: Wed, 20 Oct 2010 13:19:31 +0200
From: Tavis Ormandy <taviso@...xchg8b.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: The GNU C library dynamic linker expands
	$ORIGIN in setuid library search path

Louis Granboulan <louis.granboulan.security@...il.com> wrote:
> However, it is quite clear to me that the current behaviour is
> inconsistent and is the reason of this security flaw. We see $ ls -l
> /proc/self/fd/3 pretend that it is a symbolic link to a file that does not
> exist, and $ ls -lL /proc/self/fd/3 show a setuid file.
> 
> 

Louis, the commands specified in the advisory were intended to help
illustrate the problem, not be a replacement for any analysis. Your
questions were anticipated, and answered in the Notes section.

Next time I will put the Notes section at the top ;-)

Tavis.

-- 
-------------------------------------
taviso@...xchg8b.com | pgp encrypted mail preferred
-------------------------------------------------------

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/