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Re: The GNU C library dynamic linker expands $ORIGIN in setuid library search path
From: Tavis Ormandy <taviso () cmpxchg8b com>
Date: Tue, 19 Oct 2010 21:52:54 +0200

Hanno Böck <hanno () hboeck de> wrote:

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.

Hi Hanno, I explained why this is insufficient in the Notes section of my
advisory, along with some example code to circumvent this.


taviso () cmpxchg8b com | pgp encrypted mail preferred

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