Date: Mon, 7 Mar 2011 19:32:59 -0500 From: Steve Grubb <sgrubb@...hat.com> To: oss-security@...ts.openwall.com Cc: "Dmitry V. Levin" <ldv@...linux.org> Subject: Re: ldd can execute an app unexpectedly On Monday, March 07, 2011 07:00:11 pm Dmitry V. Levin wrote: > On Mon, Mar 07, 2011 at 06:27:05PM -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. Or it could simply detect that another linker was requested > > and make you add a "--force" so that you are fully aware that you just > > let another linker run. (The suggested patch can certainly be improved. > > But its here just in case you want it.) > > In June of 2002, I suggested to change ldd to avoid invoking programs > directly, even when it seems like that would work, and invoke the dynamic > linker as a program instead. > This change was implemented at least in Owl and ALT Linux: > http://cvsweb.openwall.com/cgi/cvsweb.cgi/~checkout~/Owl/packages/glibc/gli > bc-2.3.6-owl-alt-ldd.diff > http://git.altlinux.org/gears/g/glibc.git?p=glibc.git;a=commitdiff;h=78857 > 7027d2950e9508a434475e04c3af864d169 To be clear, I in no way want credit for this. Its been known for a long time. But if requirements have been loosened for CVEs, this is something people want to know about and probably patch. I strongly believe that it should be fixed. Any other skeletons in the closet that never got a CVE? -Steve
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