3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
128 lines
4.8 KiB
Text
128 lines
4.8 KiB
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-----
|