FreeBSD Security Advisory 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@xxxxxxxxxxxx>
Todd C. Miller <Todd.Miller@xxxxxxxxxxxxx>
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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