-----BEGIN PGP SIGNED MESSAGE-----

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                   ESB-2002.040 -- FreeBSD-SA-02:06.sudo
              sudo port may enable local privilege escalation
                              21 January 2002

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                sudo
Vendor:                 FreeBSD Ports Collection
Operating System:       FreeBSD
Impact:                 Root Compromise
Access Required:        Existing Account

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----

=============================================================================
FreeBSD-SA-02:06                                            Security Advisory
                                                                FreeBSD, Inc.

Topic:          sudo port may enable local privilege escalation

Category:       ports
Module:         sudo
Announced:      2002-01-16
Credits:        Sebastian Krahmer <krahmer@suse.de>
Affects:        Ports collection prior to the correction date
Corrected:      2002-01-15 02:56:33 UTC
FreeBSD only:   NO

I.   Background

Sudo is a program designed to allow a sysadmin to give limited root
privileges to users and log root activity.

II.  Problem Description

The sudo port, versions prior to sudo-1.6.4.1, contains a
vulnerability that may allow a local user to obtain superuser
privileges.

If a user who has not been authorized by the system administrator
(listed in the `sudoers' file) attempts to use sudo, sudo will send an
email alert.  When it does so, it invokes the system mailer with
superuser privileges, and with most of the user's environment intact.

The sudo 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 6000 third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.4 contains this
problem since it was discovered after the release.

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

If the system mailer's behavior can be influenced by the settings of
environmental variables, then an attacker may obtain superuser
privileges.  There is at least one mailer (postfix) that can be
influenced in this fashion.

IV.  Workaround

1) Deinstall the sudo port/package if you have it installed.

V.   Solution

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

2) Deinstall the old package and install a new package dated after the
correction date, obtained from the following directories:

[i386]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/security/sudo-1.6.4.1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/security/sudo-1.6.4.1.tgz

[alpha]
Packages are not automatically generated for the alpha architecture at
this time due to lack of build resources.

NOTE: It may be several days before updated packages are available.

3) Download a new port skeleton for the sudo 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-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in the FreeBSD ports collection.

Path                                                             Revision
- - -------------------------------------------------------------------------
ports/security/sudo/Makefile                                         1.43
ports/security/sudo/distinfo                                         1.26
- - -------------------------------------------------------------------------
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (FreeBSD)
Comment: For info see http://www.gnupg.org

iQCVAwUBPEYIq1UuHi5z0oilAQEgTAP/YXD+lSngGwbloUn09xvwgn8i5uGaEX5O
Rj1v7XM3HRT/Gmr1CJiK7LtMbj/iilHzC2YiTAUHyxYzdEU7k9SnLgxK6rcSYNql
5wkYL1asHQhFPYejEqQVPKejrr4L/+/bYmQbkLKc9EMdErnhYoNrw6QbN+XvmO6p
oAzSK07ixi4=
=rmb8
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key

iQCVAwUBPEwE1Ch9+71yA2DNAQEX6QP+LwlhCloujQFhH3wRieoOWNjTxmHs0/uo
SF4PTjmSKCs8fT3/xdjxMDNNDuBfAf4QFvqg8jEY0pvFfif5/DkYo969fqBYUbMk
Mje84n9t0qrJJ2g98J8ozZVzGMNi3jb6D5z6v8HjSAHcjl6/tQzxB5z7rE2J0bZG
CCgrC/G2bEw=
=+nNm
-----END PGP SIGNATURE-----