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FreeBSD-SA-00:49                                           Security Advisory

                                                                FreeBSD, Inc.



Topic:          eject port allows local root exploit



Category:       ports

Module:         eject

Announced:      2000-09-13

Affects:        Ports collection.

Corrected:      2000-08-21

Credits: Discovered during internal auditing

Vendor status:  Contacted

FreeBSD only:   NO



I.   Background



Eject is a utility for ejecting the media from a CD or optical disk

drive.



II.  Problem Description



The eject program is installed setuid root, and contains several

exploitable buffers which can be overflowed by local users, yielding

root privileges.



The eject port is not installed by default, nor is it "part of

FreeBSD" as such: it is part of the FreeBSD ports collection, which

contains over 3800 third-party applications in a ready-to-install

format. The ports collections shipped with FreeBSD 4.1 and 3.5.1

contain this problem since it was discovered after the releases.



FreeBSD makes no claim about the security of these third-party

applications, although an effort is underway to provide a security

audit of the most security-critical ports.



III. Impact



Unprivileged users can obtain root privileges on the local system.



If you have not chosen to install the eject port/package, then your

system is not vulnerable to this problem.



IV.  Workaround



Deinstall the eject port/package, if you have installed it, or limit

the file permissions on the /usr/local/sbin/eject file (e.g. remove

setuid permission, or limit it to a trusted group)



V.   Solution



One of the following:



1) Upgrade your entire ports collection and rebuild the eject port.



2) Deinstall the old package and install a new package dated after the

correction date, obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/sysutils/eject-1.4.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/sysutils/eject-1.4.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/sysutils/eject-1.4.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/sysutils/eject-1.4.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/sysutils/eject-1.4.tgz



NOTE: Be sure to check the file creation date on the package, because

the version number of the software has not changed.



3) download a new port skeleton for the eject port from:



http://www.freebsd.org/ports/



and use it to rebuild the port.



4) Use the portcheckout utility to automate option (3) above. The

portcheckout port is available in /usr/ports/devel/portcheckout or the

package can be obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz



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