oss-sec mailing list archives
Re: ldd can execute an app unexpectedly
From: "Dmitry V. Levin" <ldv () altlinux org>
Date: Tue, 8 Mar 2011 03:00:11 +0300
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/glibc-2.3.6-owl-alt-ldd.diff http://git.altlinux.org/gears/g/glibc.git?p=glibc.git;a=commitdiff;h=788577027d2950e9508a434475e04c3af864d169 -- ldv
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Current thread:
- ldd can execute an app unexpectedly Steve Grubb (Mar 07)
- Re: ldd can execute an app unexpectedly Dmitry V. Levin (Mar 07)
- Re: ldd can execute an app unexpectedly Steve Grubb (Mar 07)
- Re: ldd can execute an app unexpectedly Tim Brown (Mar 07)
- Re: ldd can execute an app unexpectedly Tomas Hoger (Mar 08)
- Re: ldd can execute an app unexpectedly Steve Grubb (Mar 08)
- Re: ldd can execute an app unexpectedly Dmitry V. Levin (Mar 07)