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FreeBSD Security Advisory - a third sendmail header parsing buffer overflow (FreeBSD-SA-03:13.sendmail)
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FreeBSD-SA-03:13.sendmail                                   Security Advisory
                                                          The FreeBSD Project

Topic:          a third sendmail header parsing buffer overflow

Category:       contrib
Module:         contrib_sendmail
Announced:      2003-09-17
Credits:        Michal Zalewski <lcamtuf@dione.ids.pl>
                Todd C. Miller <Todd.Miller@courtesan.com>
Affects:        All releases of FreeBSD
                FreeBSD 4-STABLE prior to the correction date
Corrected:      2003-09-17 15:18:20 UTC (RELENG_4, 4.9-PRERELEASE)
                2003-09-17 20:19:00 UTC (RELENG_5_1, 5.1-RELEASE-p5)
                2003-09-17 20:19:22 UTC (RELENG_5_0, 5.0-RELEASE-p14)
                2003-09-17 20:19:52 UTC (RELENG_4_8, 4.8-RELEASE-p7)
                2003-09-17 20:20:08 UTC (RELENG_4_7, 4.7-RELEASE-p17)
                2003-09-17 20:20:31 UTC (RELENG_4_6, 4.6-RELEASE-p20)
                2003-09-17 20:20:54 UTC (RELENG_4_5, 4.5-RELEASE-p32)
                2003-09-17 20:21:15 UTC (RELENG_4_4, 4.4-RELEASE-p42)
                2003-09-17 20:21:40 UTC (RELENG_4_3, 4.3-RELEASE-p38)
                2003-09-17 20:22:03 UTC (RELENG_3)
FreeBSD only:   NO

I.   Background

FreeBSD includes sendmail(8), a general purpose internetwork mail
routing facility, as the default Mail Transfer Agent (MTA).

II.  Problem Description

A buffer overflow that may occur during header parsing was identified.

NOTE WELL:  This issue is distinct from the issue described in
`FreeBSD-SA-03:04.sendmail' and `FreeBSD-SA-03:07.sendmail', although
the impact is very similar.

III. Impact

An attacker could create a specially crafted message that may cause
sendmail to execute arbitrary code with the privileges of the user
running sendmail, typically root.  The malicious message might be
handled (and the vulnerability triggered) by the initial sendmail MTA,
by any relaying sendmail MTA, or by the delivering sendmail process.

IV.  Workaround

Disable sendmail by executing the following commands as root:

  # sh /etc/rc.sendmail stop
  # chmod 0 /usr/libexec/sendmail/sendmail

Be sure that sendmail is not restarted when the system is restarted
by adding the following line to the end of /etc/rc.conf:

  sendmail_enable="NO"
  sendmail_submit_enable="NO"
  sendmail_outbound_enable="NO"

V.   Solution

Do one of the following:

1) Upgrade your vulnerable system to 4-STABLE; or to the RELENG_5_1,
RELENG_4_8, or RELENG_4_7 security branch dated after the correction
date.

2) To patch your present system:

The following patch has been verified to apply to FreeBSD 5.1, 4.8,
and 4.7 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:13/sendmail.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:13/sendmail.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libsm
# make obj && make depend && make
# cd /usr/src/lib/libsmutil
# make obj && make depend && make
# cd /usr/src/usr.sbin/sendmail
# make obj && make depend && make && make install

c) Restart sendmail.  Execute the following command as root.

# /bin/sh /etc/rc.sendmail restart

VI.  Correction details

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

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_4
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.2.6.14
RELENG_5_1
  src/UPDATING                                                  1.251.2.6
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.17.2.1
  src/contrib/sendmail/src/version.c                         1.1.1.19.2.1
  src/sys/conf/newvers.sh                                        1.50.2.7
RELENG_5_0
  src/UPDATING                                                 1.229.2.20
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.14.2.3
  src/contrib/sendmail/src/version.c                         1.1.1.16.2.2
  src/sys/conf/newvers.sh                                       1.48.2.15
RELENG_4_8
  src/UPDATING                                              1.73.2.80.2.9
  src/contrib/sendmail/src/parseaddr.c                   1.1.1.2.6.12.2.2
  src/contrib/sendmail/src/version.c                     1.1.1.3.2.14.2.2
  src/sys/conf/newvers.sh                                   1.44.2.29.2.8
RELENG_4_7
  src/UPDATING                                             1.73.2.74.2.20
  src/contrib/sendmail/src/parseaddr.c                   1.1.1.2.6.10.2.3
  src/contrib/sendmail/src/version.c                     1.1.1.3.2.12.2.2
  src/sys/conf/newvers.sh                                  1.44.2.26.2.19
RELENG_4_6
  src/UPDATING                                             1.73.2.68.2.48
  src/contrib/sendmail/src/parseaddr.c                    1.1.1.2.6.8.2.3
  src/contrib/sendmail/src/version.c                      1.1.1.3.2.9.2.2
  src/sys/conf/newvers.sh                                  1.44.2.23.2.37
RELENG_4_5
  src/UPDATING                                             1.73.2.50.2.49
  src/contrib/sendmail/src/parseaddr.c                    1.1.1.2.6.6.4.3
  src/contrib/sendmail/src/version.c                      1.1.1.3.2.7.4.2
  src/sys/conf/newvers.sh                                  1.44.2.20.2.33
RELENG_4_4
  src/UPDATING                                             1.73.2.43.2.50
  src/contrib/sendmail/src/parseaddr.c                    1.1.1.2.6.6.2.3
  src/contrib/sendmail/src/version.c                      1.1.1.3.2.7.2.2
  src/sys/conf/newvers.sh                                  1.44.2.17.2.41
RELENG_4_3
  src/UPDATING                                             1.73.2.28.2.37
  src/contrib/sendmail/src/parseaddr.c                    1.1.1.2.6.4.2.3
  src/contrib/sendmail/src/version.c                      1.1.1.3.2.4.2.2
  src/sys/conf/newvers.sh                                  1.44.2.14.2.27
RELENG_3
  src/contrib/sendmail/src/parseaddr.c                        1.1.1.2.2.3
  src/contrib/sendmail/src/version.c                          1.1.1.2.2.3
- -------------------------------------------------------------------------

VII. References

<URL:
http://lists.netsys.com/pipermail/full-disclosure/2003-September/010287.html >
<URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0694 >
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