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Date: Sat, 14 Jun 2014 22:37:25 +0400
From: Solar Designer <solar@...nwall.com>
To: musl@...ts.openwall.com
Subject: Re: Binaries compiled with musl (1.1.2) are vulnerable to an ancient ldd exploit
On Sat, Jun 14, 2014 at 02:29:42PM -0400, Rich Felker wrote:
> Stock glibc accepts all of the LD_* environment variables for
> suid/sgid, including dangerous ones, and only applies weak
> restrictions to them (for example it even allows LD_PRELOAD after
> imposing some insufficient conditions on the library to be preloaded).
Oh, I recall it allows LD_PRELOAD on libraries that are placed in system
directories and are themselves marked with the SUID bit. IIRC, libc5's
dynamic linker had that, too.
Alexander
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