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

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Message-Id: <201010192017.58449.hanno@hboeck.de>
Date: Tue, 19 Oct 2010 20:17:57 +0200
From: Hanno Böck <hanno@...eck.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: The GNU C library dynamic linker expands
	$ORIGIN in setuid library search path

Am Monday 18 October 2010 schrieb Tavis Ormandy:
> # Open a file descriptor to the target binary (note: some users are
> surprised # to learn exec can be used to manipulate the redirections of
> the current # shell if a command is not specified. This is what is
> happening below). 
> $ exec 3< /tmp/exploit/target

I tried to reproduce this on Gentoo and it fails at this point. It seems the 
reason is that suid-binaries are not world-readable on Gentoo (on Debian they 
are) - this seems to be a useful security measure.

-- 
Hanno Böck		Blog:		http://www.hboeck.de/
GPG: 3DBD3B20		Jabber/Mail:	hanno@...eck.de

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