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Date: Tue, 8 Mar 2011 10:14:39 +0100
From: Tomas Hoger <thoger@...hat.com>
To: oss-security@...ts.openwall.com
Cc: sgrubb@...hat.com
Subject: Re: ldd can execute an app unexpectedly

On Mon, 7 Mar 2011 18:27:05 -0500 Steve Grubb wrote:

>  http://reverse.lostrealm.com/protect/ldd.html
>  http://www.catonmat.net/blog/ldd-arbitrary-code-execution/
> 
> Besides telling everyone don't do that. ldd could take the PoV that
> it should only call runtime linkers in trusted directories like /sbin
> or /usr/sbin.

Upstream does not seem to consider this to be an issue:
  https://bugzilla.redhat.com/show_bug.cgi?id=531160#c1

Debian also uses the patch similar to what ldv pointed out - it changes
ldd to always do:

  LD_TRACE_LOADED_OBJECTS=1 /lib/ld-linux.so.2 /path/to/ELF-lib-or-binary

rather than:

  LD_TRACE_LOADED_OBJECTS=1 /path/to/ELF-lib-or-binary

-- 
Tomas Hoger / Red Hat Security Response Team

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