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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