Re: Local root exploit on Mac OS X with Adobe Version Cue
From: Chet Ramey (chet_at_caleb.ins.cwru.edu)
Date: Tue, 7 Dec 2004 14:05:14 -0500 To: firstname.lastname@example.org
> Local root exploit on Mac OS X 10.3.6 with Adobe products installed
> Found by Jonathan Bringhurst <email@example.com.NOSPAM>
> It's possible to create a suid root shell with a non-privileged user
> on a Mac OS X 10.3.6 system with Adobe Version Cue installed. Adobe
> Version Cue is installed by default with virtually every recent Adobe
> product. This most likely affects many versions of Mac OS X and Adobe
> Version Cue.
> Scripts to start and stop Adobe Version Cue are suid root and do not
> make any checks to see if they are running from the correct path. By
> setting the current path to a controlled directory and creating
> scripts with specific names, a user can have a custom script run euid
This is the result of an Apple-introduced problem in bash-2.05b. Bash,
as distributed, gives up setuid privileges when invoked without the -p
option, if the kernel allows setuid scripts to run. Apple changed bash
to keep setuid if bash is invoked as `sh'.
You can solve this particular problem by removing the setuid bit from
the scripts and tightening up path checking, but it's going to be a
potential problem until Apple reconsiders their permitting setuid scripts.
-- ``The lyf so short, the craft so long to lerne.'' - Chaucer ( ``Discere est Dolere'' -- chet ) Live...Laugh...Love Chet Ramey, ITS, CWRU firstname.lastname@example.org http://tiswww.tis.cwru.edu/~chet/