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Subject: FreeBSD Security Advisory FreeBSD-SA-02:40.kadmind
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-02:40.kadmind Security Advisory
The FreeBSD Project
Topic: Buffer overflow in kadmind daemon
Category: core, ports
Module: crypto_heimdal, crypto_kerberosIV, heimdal, krb5
Announced: 2002-11-12
Credits: Johan Danielsson <joda@pdc.kth.se>,
Sam Hartman <hartmans@mit.edu>,
Love Hoernquist-Astrand <lha@stacken.kth.se>,
Tom Yu <tlyu@mit.edu>
Affects: All releases prior to and including FreeBSD 4.7-RELEASE.
Corrected: 2002-10-23 13:07:44 UTC (RELENG_4)
2002-10-23 13:21:32 UTC (RELENG_4_7)
2002-10-23 13:21:02 UTC (RELENG_4_6)
2002-10-23 13:20:19 UTC (RELENG_4_5)
2002-10-23 13:19:46 UTC (RELENG_4_4)
2002-10-24 02:52:00 UTC (RELENG_3)
2002-10-23 22:30:39 UTC (krb5 port, krb5-1.2.6_1)
2002-10-24 15:01:11 UTC (heimdal port, heimdal-0.5.1)
FreeBSD only: NO
I. Background
The Kerberos 4 administrative server, kadmind, runs on the Kerberos
Key Distribution Center (KDC) and provides administrative access to
the Kerberos database. It is part of the KTH Kerberos 4
implementation. The Kerberos 5 administrative server, k5admind,
provides the same function in the Heimdal Kerberos 5 implementation,
and includes a Kerberos 4 compatibility feature.
The k5admind server is installed as part of the `krb5' distribution,
or when building from source with MAKE_KERBEROS5 set. The kadmind
server is installed as part of the `krb4' distribution, or when
building from source with MAKE_KERBEROS4 set. Neither is installed by
default.
The Heimdal Kerberos 5 administrative server is also available as part
of the heimdal port (ports/security/heimdal). The MIT Kerberos 5
implementation also includes a Kerberos 5 administrative server
(ports/security/krb5). The MIT Kerberos 5 administrative server is
named `kadmind'.
II. Problem Description
A stack buffer overflow is present in the Kerberos 4 administrative
server, kadmind, and in the Kerberos 4 compatibility layer of the
Kerberos 5 administrative server, k5admind.
III. Impact
A remote attacker may send a specially formatted request to k5admind
or kadmind, triggering the stack buffer overflow and potentially
causing the administrative server to execute arbitrary code as root on
the KDC. The attacker need not be authenticated in order to trigger
the bug. Compromise of the KDC has an especially large impact, as
theft of the Kerberos database could allow an attacker to impersonate
any Kerberos principal in the realm(s) present in the database.
IMPORTANT NOTE: According to the MIT security team, there is evidence
that this bug is being actively exploited.
IV. Workaround
Perform one of the following:
1) Disable kadmind and/or k5admind by performing the following:
Set kadmind_server_enable (for kadmind) and kadmind5_server_enable
(for k5admind) to "NO" in /etc/rc.conf.
Check /etc/inetd.conf to verify that kadmind and k5admind are
not being started from inetd.
Check that kadmind is not running as a service by executing the
following command:
# ps axlwww | egrep 'kadmind|k5admind'
If kadmind or k5admind are running, kill them by executing the
following command as root:
# kill <process id of kadmind or k5admind>
2) Deinstall the heimdal or krb5 port/packages if installed.
V. Solution
Do one of the following:
1) Upgrade your vulnerable system to 4.7-STABLE; or to the RELENG_4_7,
RELENG_4_6, RELENG_4_5, or RELENG_4_4 security branch dated after the
correction date.
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.4, FreeBSD
4.5, FreeBSD 4.6, and FreeBSD 4.7 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:40/kadmin.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:40/kadmin.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/kerberos5/libexec/k5admind
# make depend && make all install
# cd /usr/src/kerberosIV/usr.sbin/kadmind
# make depend && make all install
If you have the `heimdal' or `krb5' port/package installed, then do
one of the following:
1) Upgrade your entire ports collection and rebuild the port.
2) Download a new port skeleton for the heimdal or krb5 port from:
http://www.freebsd.org/ports/
and use it to rebuild the port.
3) 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
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Path Revision
Branch
- -------------------------------------------------------------------------
src/crypto/heimdal/kadmin/version4.c
RELENG_4 1.1.1.1.2.4
RELENG_4_7 1.1.1.1.2.3.2.1
RELENG_4_6 1.1.1.1.2.1.8.1
RELENG_4_5 1.1.1.1.2.1.6.1
RELENG_4_4 1.1.1.1.2.1.4.1
src/crypto/kerberosIV/kadmin/kadm_ser_wrap.c
RELENG_4 1.1.1.3.2.1
RELENG_4_7 1.1.1.3.12.1
RELENG_4_6 1.1.1.3.10.1
RELENG_4_5 1.1.1.3.8.1
RELENG_4_4 1.1.1.3.6.1
src/kerberosIV/include/version.h
RELENG_4 1.3.2.1
RELENG_4_7 1.3.12.1
RELENG_4_6 1.3.10.1
RELENG_4_5 1.3.8.1
RELENG_4_4 1.3.6.1
src/kerberos5/include/version.h
RELENG_4 1.2.2.6
RELENG_4_7 1.2.2.5.2.1
RELENG_4_6 1.2.2.3.2.1
RELENG_4_5 1.2.2.2.4.1
RELENG_4_4 1.2.2.2.2.1
- -------------------------------------------------------------------------
For Heimdal Kerberos 5 and MIT Kerberos 5 found in the FreeBSD Ports
Collection, the first corrected versions are:
ports/security/heimdal heimdal-0.5.1
ports/security/krb5 krb5-1.2.6_1
VII. References
<URL:http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2002-002-kadm4.txt>
<URL:ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2002-026.txt.asc>
<URL:http://www.pdc.kth.se/heimdal/>
<URL:http://www.pdc.kth.se/kth-krb/>
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To: FreeBSD Security Advisories <security-advisories@freebsd.org>
Subject: FreeBSD Security Advisory FreeBSD-SA-02:41.smrsh
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-02:41.smrsh Security Advisory
The FreeBSD Project
Topic: smrsh restrictions can be bypassed
Category: core
Module: contrib_sendmail
Announced: 2002-11-12
Credits: zen-parse <zen-parse@gmx.net>,
Pedram Amini <pamini@idefense.com>,
iDEFENSE <URL:http://www.idefense.com/>
Affects: All releases prior to FreeBSD 4.7-RELEASE
Corrected: 2002-10-08 00:53:31 UTC (RELENG_4)
2002-10-08 00:57:20 UTC (RELENG_4_7)
2002-10-26 21:11:30 UTC (RELENG_4_6)
2002-10-26 21:10:59 UTC (RELENG_4_5)
2002-10-26 21:10:22 UTC (RELENG_4_4)
2002-10-26 21:08:42 UTC (RELENG_4_3)
FreeBSD only: NO
I. Background
The sendmail Restricted Shell command (smrsh) is intended as a
replacement for the system shell (/bin/sh) for use by sendmail. It
limits the set of programs that can be executed through sendmail to
those in a single directory, and limits shell built-in commands.
II. Problem Description
Errors in smrsh's handling of command arguments with "||" or spaces
may allow the execution of commands outside of those in its target
directory. Since command arguments may be specified in local users'
`.forward' files, the smrsh restrictions may be bypassed using such
files that are specially crafted.
III. Impact
Users with a local account and the ability to create or modify their
`.forward' files can circumvent the smrsh restrictions. This is
mostly of consequence to systems which have local users that are not
normally allowed access to a login shell, as such users may abuse this
bug in order to execute arbitrary commands with normal privileges.
IV. Workaround
There is no known workaround, short of disabling `.forward' files. To
do so, add the following line to the sendmail.mc file, regenerate the
sendmail.cf configuration file, and restart sendmail.
define(`confFORWARD_PATH', `')dnl
V. Solution
1) Upgrade your vulnerable system to 4.7-STABLE; or to the RELENG_4_7,
RELENG_4_6, RELENG_4_5, RELENG_4_4, or RELENG_4_3 security branch
dated after the correction date.
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.4, FreeBSD
4.5, and FreeBSD 4.6 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:41/smrsh.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:41/smrsh.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/sendmail
# make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Path Revision
Branch
- -------------------------------------------------------------------------
src/contrib/sendmail/smrsh/smrsh.c
RELENG_4 1.3.6.9
RELENG_4_7 1.3.6.8.2.1
RELENG_4_6 1.3.6.6.2.1
RELENG_4_5 1.3.6.5.4.1
RELENG_4_4 1.3.6.5.2.1
RELENG_4_3 1.3.6.4.2.1
- -------------------------------------------------------------------------
VII. References
<URL:http://www.idefense.com/advisory/10.01.02.txt>
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Subject: FreeBSD Security Advisory FreeBSD-SA-02:42.resolv
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-02:42.resolv Security Advisory
The FreeBSD Project
Topic: buffer overrun in resolver
Category: core
Module: libc
Announced: 2002-11-12
Credits: KOZUKA Masahiro <kozuka@masahiro.mbox.media.kyoto-u.ac.jp>,
Mark Andrews <mark.andrews@isc.org>
Affects: All releases prior to 4.7-RELEASE
Corrected: 2002-09-22 12:20:23 2002 UTC (RELENG_4)
2002-10-23 14:48:21 2002 UTC (RELENG_4_6)
2002-10-23 14:50:52 2002 UTC (RELENG_4_5)
FreeBSD only: NO
I. Background
The resolver implements functions for making, sending and interpreting
query and reply messages with Internet domain name servers.
Hostnames, IP addresses, and other information are queried using the
resolver.
II. Problem Description
Several libc functions --- including getaddrinfo(), gethostbyname(),
getnetbyname(), and others --- utilize the DNS resolver functions
res_search, res_query, and/or res_send. These resolver functions all
return the length of the query response received, which may be larger
than the buffer supplied to hold the response. When this is the case,
the resolver-calling function may attempt to read and parse data
beyond the bounds of the buffer it supplied.
III. Impact
A malicious attacker could spoof DNS queries with specially crafted
responses that will not fit in the supplied buffer. This might cause
some applications to fail (denial-of-service).
IV. Workaround
There is no known workaround.
V. Solution
Do one of the following:
1) Upgrade your vulnerable system to 4.7-RELEASE or 4.7-STABLE; or to
the RELENG_4_7, RELENG_4_6 (4.6-RELEASE-p4), or RELENG_4_5
(4.5-RELEASE-p22) security branch dated after the correction date.
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.5 and
FreeBSD 4.6 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:42/resolv.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:42/resolv.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system as described in
<URL:http://www.freebsd.org/doc/handbook/makeworld.html>.
Note that any statically linked applications that are not part of
the base system (i.e. from the Ports Collection or other 3rd-party
sources) must be recompiled.
All affected applications must be restarted for them to use the
corrected library. Though not required, rebooting may be the easiest
way to accomplish this.
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Path Revision
Branch
- -------------------------------------------------------------------------
src/lib/libc/net/getaddrinfo.c
RELENG_4 1.9.2.11
RELENG_4_6 1.9.2.9.2.1
RELENG_4_5 1.9.2.8.4.1
src/lib/libc/net/gethostbydns.c
RELENG_4 1.27.2.3
RELENG_4_6 1.27.10.2
RELENG_4_5 1.27.8.2
src/lib/libc/net/getnetbydns.c
RELENG_4 1.13.2.3
RELENG_4_6 1.13.2.1.8.2
RELENG_4_5 1.13.2.1.6.2
src/lib/libc/net/name6.c
RELENG_4 1.6.2.7
RELENG_4_6 1.6.2.5.8.2
RELENG_4_5 1.6.2.5.6.2
src/lib/libc/net/res_mkquery.c
RELENG_4 1.15.2.2
RELENG_4_6 1.15.2.1.6.1
RELENG_4_5 1.15.2.1.4.1
- -------------------------------------------------------------------------
VII. References
<URL:http://www.kb.cert.org/vuls/id/738331>
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Subject: FreeBSD Security Advisory FreeBSD-SA-02:43.bind
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-02:43.bind Security Advisory
The FreeBSD Project
Topic: multiple vulnerabilities in BIND
Category: core
Module: bind
Announced: 2002-11-14
Credits: ISS X-Force <xforce@iss.net>
Affects: All released versions of FreeBSD
Corrected: 2002-11-14 05:15:15 UTC (RELENG_4)
2002-11-14 02:05:57 UTC (RELENG_4_7)
2002-11-14 03:18:41 UTC (RELENG_4_6)
2002-11-14 04:05:12 UTC (RELENG_4_5)
2002-11-14 05:11:57 UTC (RELENG_4_4)
FreeBSD only: NO
I. Background
BIND 8 is an implementation of the Domain Name System (DNS) protocols.
II. Problem Description
ISS X-Force has disclosed several vulnerabilities affecting BIND 8.
The names which ISS has given each vulnerability are used in this
advisory. The first is a buffer overflow in the BIND 8 code
responsible for creating DNS responses which include SIG resource
records (RRs) from its internal cache (`BIND SIG Cached RR Overflow
Vulnerability'). The second is an error in the BIND 8 code which
constructs a response to an EDNS query (i.e. a query containing OPT
RRs) with a large packet size. A miscalculation triggers an assertion
failure (`BIND OPT DoS'). The third is a problem in the verification
of SIG RR expiry times, which can result in a null pointer dereference
(`BIND SIG Expiry Time DoS').
III. Impact
BIND SIG Cached RR Overflow Vulnerability: A remote attacker may be
able to cause a name server with recursion enabled to execute
arbitrary code with the privileges of the name server process.
BIND OPT DoS and BIND SIG Expiry Time DoS: A remote attacker may be
able to cause the name server process to crash.
IV. Workaround
BIND 9 is not affected by these vulnerabilities. For those who have
the option, upgrading to BIND 9 is recommended. BIND 9 is available
in the FreeBSD Ports Collection (ports/net/bind9). The bind9 port
includes migration notes in /usr/local/share/doc/bind9/misc/migration.
Name servers with recursion disabled are not vulnerable to the `BIND
SIG Cached RR Overflow Vulnerability' nor to the `BIND SIG Expiry Time
DoS'. To disable recursion, edit the BIND 8 configuration file
(default path /etc/namedb/named.conf) to add `recursion no;' and
`fetch-glue no;' to the options statement. e.g.,
options {
recursion no;
fetch-glue no;
/* ... other options ... */
};
Restart the name server after editing the configuration file.
Restricting recursion to only your own organization's clients (by
means of the `allow-recursion' directive) limits, but does not
eliminate, the impact of these vulnerabilities by making them harder
to exploit. Restricting recursion in this fashion is generally
recommended. To restrict recursion, edit the BIND 8 configuration
file to include an `allow-recursion' statement and an address list
appropriate for your organization. e.g.,
options {
allow-recursion { 10.0.0.0/8; };
/* ... other options ... */
};
Running BIND 8 as a non-privileged user (rather than as the superuser)
may reduce the impact should the name server be compromised via the
`BIND SIG Cached RR Overflow Vulnerability'. Running as a
non-privileged user is generally recommended. Likewise, running BIND
8 in a chroot environment may reduce the impact and is generally
recommended.
V. Solution
Do one of the following:
1) Upgrade your vulnerable system to 4.7-STABLE; or to the RELENG_4_7,
RELENG_4_6, RELENG_4_5, or RELENG_4_4 security branch dated after the
correction date (4.7-RELEASE-p2, 4.6.2-RELEASE-p5, 4.5-RELEASE-p23,
4.4-RELEASE-p30).
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.4, 4.5,
4.6, and 4.7 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:43/bind.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:43/bind.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/named
# make depend && make && make install
# cd /usr/src/libexec/named-xfer
# make depend && make && make install
After upgrading or patching your system, you must restart named.
Execute the following command as root:
# ndc restart
VI. Correction details
Path Revision
Branch
- -------------------------------------------------------------------------
src/contrib/bind/CHANGES
RELENG_4 1.1.1.7.2.8
RELENG_4_7 1.1.1.7.2.7.2.1
RELENG_4_6 1.1.1.7.2.6.2.2
RELENG_4_5 1.1.1.7.2.4.4.2
RELENG_4_4 1.1.1.7.2.4.2.2
src/contrib/bind/bin/named/db_defs.h
RELENG_4 1.1.1.2.2.6
RELENG_4_7 1.1.1.2.2.5.2.1
RELENG_4_6 1.1.1.2.2.4.2.2
RELENG_4_5 1.1.1.2.2.3.4.2
RELENG_4_4 1.1.1.2.2.3.2.2
src/contrib/bind/bin/named/db_sec.c
RELENG_4 1.1.1.1.4.4
RELENG_4_7 1.1.1.1.4.3.4.1
RELENG_4_6 1.1.1.1.4.3.2.1
RELENG_4_5 1.1.1.1.4.2.6.2
RELENG_4_4 1.1.1.1.4.2.4.2
src/contrib/bind/bin/named/ns_defs.h
RELENG_4 1.1.1.3.2.7
RELENG_4_7 1.1.1.3.2.6.2.1
RELENG_4_6 1.1.1.3.2.5.2.2
RELENG_4_5 1.1.1.3.2.3.4.2
RELENG_4_4 1.1.1.3.2.3.2.2
src/contrib/bind/bin/named/ns_ncache.c
RELENG_4 1.1.1.2.2.3
RELENG_4_7 1.1.1.2.2.2.4.1
RELENG_4_6 1.1.1.2.2.2.2.1
RELENG_4_5 1.1.1.2.2.1.6.2
RELENG_4_4 1.1.1.2.2.1.4.2
src/contrib/bind/bin/named/ns_req.c
RELENG_4 1.1.1.2.2.11
RELENG_4_7 1.1.1.2.2.10.2.1
RELENG_4_6 1.1.1.2.2.9.2.2
RELENG_4_5 1.1.1.2.2.7.4.2
RELENG_4_4 1.1.1.2.2.7.2.2
src/contrib/bind/bin/named/ns_resp.c
RELENG_4 1.1.1.2.2.8
RELENG_4_7 1.1.1.2.2.7.2.1
RELENG_4_6 1.1.1.2.2.6.2.2
RELENG_4_5 1.1.1.2.2.4.4.2
RELENG_4_4 1.1.1.2.2.4.2.2
src/contrib/bind/lib/nameser/ns_name.c
RELENG_4 1.1.1.2.2.4
RELENG_4_7 1.1.1.2.2.3.2.1
RELENG_4_6 1.1.1.2.2.2.2.2
RELENG_4_5 1.1.1.2.2.1.6.2
RELENG_4_4 1.1.1.2.2.1.4.2
src/contrib/bind/lib/nameser/ns_samedomain.c
RELENG_4 1.1.1.1.4.1
RELENG_4_7 1.1.1.1.14.1
RELENG_4_6 1.1.1.1.12.1
RELENG_4_5 1.1.1.1.10.1
RELENG_4_4 1.1.1.1.8.1
src/sys/conf/newvers.sh
RELENG_4_7 1.44.2.26.2.4
RELENG_4_6 1.44.2.23.2.22
RELENG_4_5 1.44.2.20.2.24
RELENG_4_4 1.44.2.17.2.29
- -------------------------------------------------------------------------
VII. References
<URL:http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21469>
<URL:http://www.isc.org/products/BIND/bind-security.html>
<URL:http://www.isc.org/products/BIND/patches/>
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Date: Fri, 15 Nov 2002 05:51:52 -0800 (PST)
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From: FreeBSD Security Advisories <security-advisories@freebsd.org>
To: FreeBSD Security Advisories <security-advisories@freebsd.org>
Subject: FreeBSD Security Advisory FreeBSD-SA-02:41.smrsh [REVISED]
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-02:41.smrsh Security Advisory
The FreeBSD Project
Topic: smrsh restrictions can be bypassed [REVISED]
Category: core
Module: contrib_sendmail
Announced: 2002-11-15
Credits: zen-parse <zen-parse@gmx.net>,
Pedram Amini <pamini@idefense.com>,
iDEFENSE <URL:http://www.idefense.com/>
Affects: All releases prior to FreeBSD 4.7-RELEASE
Corrected: 2002-10-08 00:53:31 UTC (RELENG_4)
2002-10-08 00:57:20 UTC (RELENG_4_7)
2002-10-26 21:11:30 UTC (RELENG_4_6)
2002-10-26 21:10:59 UTC (RELENG_4_5)
2002-10-26 21:10:22 UTC (RELENG_4_4)
2002-10-26 21:08:42 UTC (RELENG_4_3)
FreeBSD only: NO
0. Revision History
v1.0 2002-11-12 Initial release.
v1.1 2002-11-15 Correct patch instructions. Update workaround.
Add CVE reference.
I. Background
The sendmail Restricted Shell command (smrsh) is intended as a
replacement for the system shell (/bin/sh) for use by sendmail. It
limits the set of programs that can be executed through sendmail to
those in a single directory, and limits shell built-in commands.
II. Problem Description
Errors in smrsh's handling of command arguments with "||" or spaces
may allow the execution of commands outside of those in its target
directory. Since command arguments may be specified in local users'
`.forward' files, the smrsh restrictions may be bypassed using such
files that are specially crafted.
III. Impact
Users with a local account and the ability to create or modify their
`.forward' files can circumvent the smrsh restrictions. This is
mostly of consequence to systems which have local users that are not
normally allowed access to a login shell, as such users may abuse this
bug in order to execute arbitrary commands with normal privileges.
IV. Workaround
[The workaround described in revision 1.0 of this advisory was
effective, but disabled more functionality than was necessary.]
Disable sendmail delivery to programs. To do so, add the following line
to the sendmail.mc file, regenerate the sendmail.cf configuration file,
and restart sendmail.
MODIFY_MAILER_FLAGS(`LOCAL', `-|')
V. Solution
1) Upgrade your vulnerable system to 4.7-STABLE; or to the RELENG_4_7,
RELENG_4_6, RELENG_4_5, RELENG_4_4, or RELENG_4_3 security branch
dated after the correction date.
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.4, FreeBSD
4.5, and FreeBSD 4.6 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:41/smrsh.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:41/smrsh.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libsm
# make depend && make
# cd /usr/src/lib/libsmutil
# make depend && make
# cd /usr/src/usr.sbin/sendmail
# make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Path Revision
Branch
- -------------------------------------------------------------------------
src/contrib/sendmail/smrsh/smrsh.c
RELENG_4 1.3.6.9
RELENG_4_7 1.3.6.8.2.1
RELENG_4_6 1.3.6.6.2.1
RELENG_4_5 1.3.6.5.4.1
RELENG_4_4 1.3.6.5.2.1
RELENG_4_3 1.3.6.4.2.1
- -------------------------------------------------------------------------
VII. References
<URL:http://www.idefense.com/advisory/10.01.02.txt>
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1165>
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Subject: FreeBSD Security Advisory FreeBSD-SA-02:43.bind [REVISED]
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-02:43.bind Security Advisory
The FreeBSD Project
Topic: multiple vulnerabilities in BIND [REVISED]
Category: core
Module: bind
Announced: 2002-11-15
Credits: ISS X-Force <xforce@iss.net>
Affects: All released versions of FreeBSD
Corrected: 2002-11-14 05:15:15 UTC (RELENG_4)
2002-11-14 02:05:57 UTC (RELENG_4_7)
2002-11-14 03:18:41 UTC (RELENG_4_6)
2002-11-14 04:05:12 UTC (RELENG_4_5)
2002-11-14 05:11:57 UTC (RELENG_4_4)
FreeBSD only: NO
0. Revision History
v1.0 2002-11-14 Initial release.
v1.1 2002-11-15 Correct patch instructions. Clarify workaround.
Add CVE references.
I. Background
BIND 8 is an implementation of the Domain Name System (DNS) protocols.
II. Problem Description
ISS X-Force has disclosed several vulnerabilities affecting BIND 8.
The names which ISS has given each vulnerability are used in this
advisory. The first is a buffer overflow in the BIND 8 code
responsible for creating DNS responses which include SIG resource
records (RRs) from its internal cache (`BIND SIG Cached RR Overflow
Vulnerability'). The second is an error in the BIND 8 code which
constructs a response to an EDNS query (i.e. a query containing OPT
RRs) with a large packet size. A miscalculation triggers an assertion
failure (`BIND OPT DoS'). The third is a problem in the verification
of SIG RR expiry times, which can result in a null pointer dereference
(`BIND SIG Expiry Time DoS').
III. Impact
BIND SIG Cached RR Overflow Vulnerability: A remote attacker may be
able to cause a name server with recursion enabled to execute
arbitrary code with the privileges of the name server process.
BIND OPT DoS and BIND SIG Expiry Time DoS: A remote attacker may be
able to cause the name server process to crash.
IV. Workaround
BIND 9 is not affected by these vulnerabilities. For those who have
the option, upgrading to BIND 9 is recommended. BIND 9 is available
in the FreeBSD Ports Collection (ports/net/bind9). The bind9 port
includes migration notes in /usr/local/share/doc/bind9/misc/migration.
Name servers with recursion disabled are not vulnerable to the `BIND
SIG Cached RR Overflow Vulnerability' nor to the `BIND SIG Expiry Time
DoS'. To disable recursion, edit the BIND 8 configuration file
(default path /etc/namedb/named.conf) to add `recursion no;' and
`fetch-glue no;' to the options statement. e.g.,
options {
recursion no;
fetch-glue no;
/* ... other options ... */
};
Restart the name server after editing the configuration file.
NOTE: This workaround is only appropriate for name servers
which are authoritative only. Caching name servers will no longer
function correctly if recursion is disabled.
Restricting recursion to only your own organization's clients (by
means of the `allow-recursion' directive) limits, but does not
eliminate, the impact of these vulnerabilities by making them harder
to exploit. Restricting recursion in this fashion is generally
recommended. To restrict recursion, edit the BIND 8 configuration
file to include an `allow-recursion' statement and an address list
appropriate for your organization. e.g.,
options {
allow-recursion { 10.0.0.0/8; };
/* ... other options ... */
};
Running BIND 8 as a non-privileged user (rather than as the superuser)
may reduce the impact should the name server be compromised via the
`BIND SIG Cached RR Overflow Vulnerability'. Running as a
non-privileged user is generally recommended. Likewise, running BIND
8 in a chroot environment may reduce the impact and is generally
recommended.
V. Solution
Do one of the following:
1) Upgrade your vulnerable system to 4.7-STABLE; or to the RELENG_4_7,
RELENG_4_6, RELENG_4_5, or RELENG_4_4 security branch dated after the
correction date (4.7-RELEASE-p2, 4.6.2-RELEASE-p5, 4.5-RELEASE-p23,
4.4-RELEASE-p30).
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.4, 4.5,
4.6, and 4.7 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:43/bind.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:43/bind.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libbind
# make depend && make
# cd /usr/src/lib/libisc
# make depend && make
# cd /usr/src/usr.sbin/named
# make depend && make && make install
# cd /usr/src/libexec/named-xfer
# make depend && make && make install
After upgrading or patching your system, you must restart named.
Execute the following command as root:
# ndc restart
VI. Correction details
Path Revision
Branch
- -------------------------------------------------------------------------
src/contrib/bind/CHANGES
RELENG_4 1.1.1.7.2.8
RELENG_4_7 1.1.1.7.2.7.2.1
RELENG_4_6 1.1.1.7.2.6.2.2
RELENG_4_5 1.1.1.7.2.4.4.2
RELENG_4_4 1.1.1.7.2.4.2.2
src/contrib/bind/bin/named/db_defs.h
RELENG_4 1.1.1.2.2.6
RELENG_4_7 1.1.1.2.2.5.2.1
RELENG_4_6 1.1.1.2.2.4.2.2
RELENG_4_5 1.1.1.2.2.3.4.2
RELENG_4_4 1.1.1.2.2.3.2.2
src/contrib/bind/bin/named/db_sec.c
RELENG_4 1.1.1.1.4.4
RELENG_4_7 1.1.1.1.4.3.4.1
RELENG_4_6 1.1.1.1.4.3.2.1
RELENG_4_5 1.1.1.1.4.2.6.2
RELENG_4_4 1.1.1.1.4.2.4.2
src/contrib/bind/bin/named/ns_defs.h
RELENG_4 1.1.1.3.2.7
RELENG_4_7 1.1.1.3.2.6.2.1
RELENG_4_6 1.1.1.3.2.5.2.2
RELENG_4_5 1.1.1.3.2.3.4.2
RELENG_4_4 1.1.1.3.2.3.2.2
src/contrib/bind/bin/named/ns_ncache.c
RELENG_4 1.1.1.2.2.3
RELENG_4_7 1.1.1.2.2.2.4.1
RELENG_4_6 1.1.1.2.2.2.2.1
RELENG_4_5 1.1.1.2.2.1.6.2
RELENG_4_4 1.1.1.2.2.1.4.2
src/contrib/bind/bin/named/ns_req.c
RELENG_4 1.1.1.2.2.11
RELENG_4_7 1.1.1.2.2.10.2.1
RELENG_4_6 1.1.1.2.2.9.2.2
RELENG_4_5 1.1.1.2.2.7.4.2
RELENG_4_4 1.1.1.2.2.7.2.2
src/contrib/bind/bin/named/ns_resp.c
RELENG_4 1.1.1.2.2.8
RELENG_4_7 1.1.1.2.2.7.2.1
RELENG_4_6 1.1.1.2.2.6.2.2
RELENG_4_5 1.1.1.2.2.4.4.2
RELENG_4_4 1.1.1.2.2.4.2.2
src/contrib/bind/lib/nameser/ns_name.c
RELENG_4 1.1.1.2.2.4
RELENG_4_7 1.1.1.2.2.3.2.1
RELENG_4_6 1.1.1.2.2.2.2.2
RELENG_4_5 1.1.1.2.2.1.6.2
RELENG_4_4 1.1.1.2.2.1.4.2
src/contrib/bind/lib/nameser/ns_samedomain.c
RELENG_4 1.1.1.1.4.1
RELENG_4_7 1.1.1.1.14.1
RELENG_4_6 1.1.1.1.12.1
RELENG_4_5 1.1.1.1.10.1
RELENG_4_4 1.1.1.1.8.1
src/sys/conf/newvers.sh
RELENG_4_7 1.44.2.26.2.4
RELENG_4_6 1.44.2.23.2.22
RELENG_4_5 1.44.2.20.2.24
RELENG_4_4 1.44.2.17.2.29
- -------------------------------------------------------------------------
VII. References
<URL:http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21469>
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1219>
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1220>
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1221>
<URL:http://www.isc.org/products/BIND/bind-security.html>
<URL:http://www.isc.org/products/BIND/patches/>
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