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AUSCERT External Security Bulletin Redistribution
ESB-2000.253 -- FreeBSD-SA-00:49
eject port allows local root exploit
14 September 2000
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AusCERT Security Bulletin Summary
---------------------------------
Product: eject
Vendor: FreeBSD Ports Collection
Operating System: FreeBSD
Linux
Unix
Platform: N/A
Impact: Root Compromise
Access Required: Local
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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:
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/sysutils/eject-1.4.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/sysutils/eject-1.4.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/sysutils/eject-1.4.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/sysutils/eject-1.4.tgz
ftp://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:
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz
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