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

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

                   ESB-2002.069 -- FreeBSD-SA-02:11.snmp
          ucd-snmp/net-snmp remotely exploitable vulnerabilities
                             13 February 2002

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

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

Product:                Net-SNMP (previously known as UCD-SNMP) package
Vendor:                 FreeBSD Ports Collection
Impact:                 Root Compromise
Access Required:        Remote

Ref:                    AL-2002.02
                        ESB-2002.065

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

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

=============================================================================
FreeBSD-SA-02:11                                            Security Advisory
                                                                FreeBSD, Inc.

Topic:          ucd-snmp/net-snmp remotely exploitable vulnerabilities

Category:       ports
Module:         net-snmp
Announced:      2002-02-12
Credits:        OUSPG: Oulu University Secure Programming Group
                http://www.ee.oulu.fi/research/ouspg/
Affects:        Ports collection prior to the correction date
Corrected:      2002-01-21 16:54:50 UTC
FreeBSD only:   NO
CERT:           CA-2002-03

I.   Background

The Net-SNMP (previously known as UCD-SNMP) package is a set of Simple
Network Management Protocol tools, including an agent, library, and
applications for generating and handling requests and traps.

NOTE: The Net-SNMP port directory is ports/net/net-snmp, but the
package name is still ucd-snmp.

II.  Problem Description

The Net-SNMP port, versions prior to 4.2.3, contains several remotely
exploitable vulnerabilities.  The OUSPG has discovered vulnerabilities
in many SNMPv1 implementations through their `PROTOS - Security
Testing of Protocol Implementations' project.  The vulnerabilities are
numerous and affect SNMPv1 request and trap handling in both managers
and agents.  Please refer to the References section for complete
details.

The Net-SNMP 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 4.5 does not
contains this problem.

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

Although no exploits are known to exist at this time, the
vulnerabilities may be exploited by a remote attacker in order to
cause the SNMP agent to execute arbitrary code with superuser
privileges.  Malicious agents may respond to requests with specially
constructed replies that cause arbitrary code to be executed by the
client.  Knowledge of the SNMP community name is unnecessary for such
exploits to be effective.


IV.  Workaround

1) Deinstall the ucd-snmp port/package if you have it installed.

V.   Solution

Do one of the following:

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/net/ucd-snmp-4.2.3.tgz

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

3) Download a new port skeleton for the net-snmp 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/Latest/portcheckout.tgz

NOTE: Many other applications utilize the Net-SNMP libraries.  These
applications may also be vulnerable.  It is recommended that such
applications be rebuilt after upgrading Net-SNMP.  The following
command will display applications installed by the FreeBSD ports
collection that utilize Net-SNMP:

  pkg_info -R ucd-snmp-*

VI.  Correction details

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

Path                                                             Revision
- - -------------------------------------------------------------------------
ports/net/net-snmp/Makefile                                          1.59
ports/net/net-snmp/distinfo                                          1.15
ports/net/net-snmp/pkg-plist                                         1.18
ports/net/net-snmp/files/freebsd4.h                             (removed)
ports/net/net-snmp/files/patch-aclocal.m4                             1.1
- - -------------------------------------------------------------------------

VII. References

<URL:http://www.cert.org/advisories/CA-2002-03.html>
<URL:http://www.ee.oulu.fi/research/ouspg/protos/>
<URL:http://www.kb.cert.org/vuls/id/107186>
<URL:http://www.kb.cert.org/vuls/id/854306>
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (FreeBSD)
Comment: For info see http://www.gnupg.org

iQCUAwUBPGmij1UuHi5z0oilAQGFQgP4ku0xC5v8hKJBXYbiSXmwVDpHpV6WHIWP
zuTSiyvKbUX7nKm6c9IMB+5ep2/SGdJXxWos+YZcncv8VgR5i47K1M1dYXwwniRg
dZMY/a2lL3B8902bHQq4zpR0TrgE7Wp1IhRNAeS8SZw1pnW86pgLsQzIr6WYhpzM
rgiaaaG+AQ==
=VdS0
- -----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

iQCVAwUBPGpPQih9+71yA2DNAQFM6wQAg7MpTtdCbKEYuWDnayZ4Qyc/7VBafX22
XNeGzqxzlwFBbrXlhFOM439ZGPf4W3f1ykNsMooejfaXFbVSmWZ6psjYHHWve+Af
4FnnVVouP1VUbo968r777+omd1zZ2FPovXBmZPS5qOuDoKPuJ8wDcerJg3KcWNlX
kCCGTRCzV4k=
=NkCO
-----END PGP SIGNATURE-----