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Category:   Application (E-mail Server)  >   Sendmail Vendors:   Sendmail Consortium
(FreeBSD Issues Fix) Sendmail Race Condition in Signal Handler May Let Remote Users Trigger a Buffer Overflow to Execute Arbitrary Code
SecurityTracker Alert ID:  1015803
SecurityTracker URL:  http://securitytracker.com/id/1015803
CVE Reference:   CVE-2006-0058   (Links to External Site)
Date:  Mar 22 2006
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 8.13.6
Description:   A vulnerability was reported in Sendmail. A remote user may be able to execute arbitrary code on the target system.

Under certain specific timing conditions, a remote user can send specially crafted e-mail data to the target system to exploit a race condition in a signal handler and trigger a buffer overflow. This may allow the remote user to execute arbitrary code on the target system with the privileges of the sendmail process.

ISS discovered this vulnerability.

The original advisory is available at:

http://xforce.iss.net/xforce/xfdb/24584

Impact:   A remote user can execute arbitrary code on the target system with the privileges of the sendmail process (typically root privileges).
Solution:   FreeBSD has issued a fix and has provided the following solution information [quoted]:

Perform one of the following:

1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or
RELENG_4_10 security branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 4.10,
4.11, 5.3, 5.4, and 6.0 systems.

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

[FreeBSD 4.10]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail410.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail410.patch.asc

[FreeBSD 4.11 and FreeBSD 5.3]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail411.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail411.patch.asc

[FreeBSD 5.4, and FreeBSD 6.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/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

The FreeBSD advisory is available at:

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:13.sendmail.asc

Vendor URL:  www.sendmail.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  4, 5, 6

Message History:   This archive entry is a follow-up to the message listed below.
Mar 22 2006 Sendmail Race Condition in Signal Handler May Let Remote Users Trigger a Buffer Overflow to Execute Arbitrary Code



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-06:13.sendmail


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=============================================================================
FreeBSD-SA-06:13.sendmail                                   Security Advisory
                                                          The FreeBSD Project

Topic:          Race condition in sendmail

Category:       contrib
Module:         contrib_sendmail
Announced:      2006-03-22
Affects:        All FreeBSD releases.
Corrected:      2006-03-22 16:01:08 UTC (RELENG_6, 6.1-STABLE)
                2006-03-22 16:01:38 UTC (RELENG_6_0, 6.0-RELEASE-p6)
                2006-03-22 16:01:56 UTC (RELENG_5, 5.5-STABLE)
                2006-03-22 16:02:17 UTC (RELENG_5_4, 5.4-RELEASE-p13)
                2006-03-22 16:02:35 UTC (RELENG_5_3, 5.3-RELEASE-p28)
                2006-03-22 16:02:49 UTC (RELENG_4, 4.11-STABLE)
                2006-03-22 16:03:05 UTC (RELENG_4_11, 4.11-RELEASE-p16)
                2006-03-22 16:03:25 UTC (RELENG_4_10, 4.10-RELEASE-p22)
CVE Name:       CVE-2006-0058

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
<URL:http://www.freebsd.org/security/>.

NOTE: The issue discussed in this advisory was reported to the FreeBSD
Security Team, and the patch which corrects it was supplied, by the
Sendmail Consortium via CERT.  Due to the limited information available
concerning the nature of the vulnerability, the FreeBSD Security Team
has not been able to evaluate the effectiveness of the fixes, nor the
possibility of other workarounds.

I.   Background

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

II.  Problem Description

A race condition has been reported to exist in the handling by sendmail
of asynchronous signals.

III. Impact

A remote attacker may be able to execute arbitrary code with the
privileges of the user running sendmail, typically root.

IV.  Workaround

There is no known workaround other than disabling sendmail.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or
RELENG_4_10 security branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 4.10,
4.11, 5.3, 5.4, and 6.0 systems.

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

[FreeBSD 4.10]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail410.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail410.patch.asc

[FreeBSD 4.11 and FreeBSD 5.3]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail411.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail411.patch.asc

[FreeBSD 5.4, and FreeBSD 6.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/sendmail.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:13/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

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/libsm/fflush.c                         1.1.1.1.2.1
  src/contrib/sendmail/libsm/local.h                          1.1.1.1.2.6
  src/contrib/sendmail/libsm/refill.c                         1.1.1.1.2.4
  src/contrib/sendmail/src/collect.c                         1.1.1.4.2.17
  src/contrib/sendmail/src/conf.c                                1.5.2.20
  src/contrib/sendmail/src/deliver.c                         1.1.1.3.2.20
  src/contrib/sendmail/src/headers.c                             1.4.2.16
  src/contrib/sendmail/src/mime.c                            1.1.1.3.2.10
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.2.6.20
  src/contrib/sendmail/src/savemail.c                            1.4.2.13
  src/contrib/sendmail/src/sendmail.h                        1.1.1.4.2.22
  src/contrib/sendmail/src/sfsasl.c                          1.1.1.1.2.16
  src/contrib/sendmail/src/sfsasl.h                           1.1.1.1.2.3
  src/contrib/sendmail/src/srvrsmtp.c                        1.1.1.2.6.20
  src/contrib/sendmail/src/usersmtp.c                        1.1.1.3.2.17
  src/contrib/sendmail/src/util.c                            1.1.1.3.2.15
RELENG_4_11
  src/contrib/sendmail/libsm/fflush.c                    1.1.1.1.2.1.12.1
  src/contrib/sendmail/libsm/local.h                      1.1.1.1.2.5.2.1
  src/contrib/sendmail/libsm/refill.c                     1.1.1.1.2.3.2.1
  src/contrib/sendmail/src/collect.c                     1.1.1.4.2.14.2.1
  src/contrib/sendmail/src/conf.c                            1.5.2.17.2.1
  src/contrib/sendmail/src/deliver.c                     1.1.1.3.2.17.2.1
  src/contrib/sendmail/src/headers.c                         1.4.2.14.2.1
  src/contrib/sendmail/src/mime.c                         1.1.1.3.2.8.2.1
  src/contrib/sendmail/src/parseaddr.c                   1.1.1.2.6.17.2.1
  src/contrib/sendmail/src/savemail.c                        1.4.2.11.2.1
  src/contrib/sendmail/src/sendmail.h                    1.1.1.4.2.19.2.1
  src/contrib/sendmail/src/sfsasl.c                      1.1.1.1.2.14.2.1
  src/contrib/sendmail/src/sfsasl.h                      1.1.1.1.2.2.12.1
  src/contrib/sendmail/src/srvrsmtp.c                    1.1.1.2.6.17.2.1
  src/contrib/sendmail/src/usersmtp.c                    1.1.1.3.2.14.2.1
  src/contrib/sendmail/src/util.c                        1.1.1.3.2.13.2.1
  src/UPDATING                                             1.73.2.91.2.17
  src/sys/conf/newvers.sh                                  1.44.2.39.2.20
RELENG_4_10
  src/contrib/sendmail/libsm/fflush.c                    1.1.1.1.2.1.10.1
  src/contrib/sendmail/libsm/local.h                      1.1.1.1.2.4.2.1
  src/contrib/sendmail/libsm/refill.c                     1.1.1.1.2.2.6.1
  src/contrib/sendmail/src/collect.c                     1.1.1.4.2.13.2.1
  src/contrib/sendmail/src/conf.c                            1.5.2.16.2.1
  src/contrib/sendmail/src/deliver.c                     1.1.1.3.2.16.2.1
  src/contrib/sendmail/src/headers.c                         1.4.2.13.2.1
  src/contrib/sendmail/src/mime.c                         1.1.1.3.2.7.2.1
  src/contrib/sendmail/src/parseaddr.c                   1.1.1.2.6.16.2.1
  src/contrib/sendmail/src/savemail.c                        1.4.2.10.6.1
  src/contrib/sendmail/src/sendmail.h                    1.1.1.4.2.18.2.1
  src/contrib/sendmail/src/sfsasl.c                      1.1.1.1.2.13.2.1
  src/contrib/sendmail/src/sfsasl.h                      1.1.1.1.2.2.10.1
  src/contrib/sendmail/src/srvrsmtp.c                    1.1.1.2.6.16.2.1
  src/contrib/sendmail/src/usersmtp.c                    1.1.1.3.2.13.2.1
  src/contrib/sendmail/src/util.c                        1.1.1.3.2.12.2.1
  src/UPDATING                                             1.73.2.90.2.23
  src/sys/conf/newvers.sh                                  1.33.2.34.2.24
RELENG_5
  src/contrib/sendmail/libsm/fflush.c                         1.1.1.3.8.1
  src/contrib/sendmail/libsm/local.h                          1.1.1.7.2.1
  src/contrib/sendmail/libsm/refill.c                         1.1.1.5.2.1
  src/contrib/sendmail/src/collect.c                         1.1.1.19.2.3
  src/contrib/sendmail/src/conf.c                                1.26.2.3
  src/contrib/sendmail/src/deliver.c                         1.1.1.21.2.3
  src/contrib/sendmail/src/headers.c                             1.20.2.2
  src/contrib/sendmail/src/mime.c                            1.1.1.12.2.2
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.20.2.3
  src/contrib/sendmail/src/savemail.c                            1.16.2.2
  src/contrib/sendmail/src/sendmail.h                        1.1.1.23.2.3
  src/contrib/sendmail/src/sfsasl.c                          1.1.1.14.2.2
  src/contrib/sendmail/src/sfsasl.h                           1.1.1.4.8.1
  src/contrib/sendmail/src/srvrsmtp.c                        1.1.1.20.2.3
  src/contrib/sendmail/src/usersmtp.c                        1.1.1.18.2.3
  src/contrib/sendmail/src/util.c                            1.1.1.17.2.2
RELENG_5_4
  src/contrib/sendmail/libsm/fflush.c                        1.1.1.3.12.1
  src/contrib/sendmail/libsm/local.h                          1.1.1.7.6.1
  src/contrib/sendmail/libsm/refill.c                         1.1.1.5.6.1
  src/contrib/sendmail/src/collect.c                     1.1.1.19.2.1.2.1
  src/contrib/sendmail/src/conf.c                            1.26.2.1.2.1
  src/contrib/sendmail/src/deliver.c                     1.1.1.21.2.1.2.1
  src/contrib/sendmail/src/headers.c                         1.20.2.1.2.1
  src/contrib/sendmail/src/mime.c                        1.1.1.12.2.1.2.1
  src/contrib/sendmail/src/parseaddr.c                   1.1.1.20.2.1.2.1
  src/contrib/sendmail/src/savemail.c                        1.16.2.1.2.1
  src/contrib/sendmail/src/sendmail.h                    1.1.1.23.2.1.2.1
  src/contrib/sendmail/src/sfsasl.c                      1.1.1.14.2.1.2.1
  src/contrib/sendmail/src/sfsasl.h                          1.1.1.4.12.1
  src/contrib/sendmail/src/srvrsmtp.c                    1.1.1.20.2.1.2.1
  src/contrib/sendmail/src/usersmtp.c                    1.1.1.18.2.1.2.1
  src/contrib/sendmail/src/util.c                        1.1.1.17.2.1.2.1
  src/UPDATING                                            1.342.2.24.2.22
  src/sys/conf/newvers.sh                                  1.62.2.18.2.18
RELENG_5_3
  src/contrib/sendmail/libsm/fflush.c                        1.1.1.3.10.1
  src/contrib/sendmail/libsm/local.h                          1.1.1.7.4.1
  src/contrib/sendmail/libsm/refill.c                         1.1.1.5.4.1
  src/contrib/sendmail/src/collect.c                         1.1.1.19.4.1
  src/contrib/sendmail/src/conf.c                                1.26.4.1
  src/contrib/sendmail/src/deliver.c                         1.1.1.21.4.1
  src/contrib/sendmail/src/headers.c                             1.20.4.1
  src/contrib/sendmail/src/mime.c                            1.1.1.12.4.1
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.20.4.1
  src/contrib/sendmail/src/savemail.c                            1.16.4.1
  src/contrib/sendmail/src/sendmail.h                        1.1.1.23.4.1
  src/contrib/sendmail/src/sfsasl.c                          1.1.1.14.4.1
  src/contrib/sendmail/src/sfsasl.h                          1.1.1.4.10.1
  src/contrib/sendmail/src/srvrsmtp.c                        1.1.1.20.4.1
  src/contrib/sendmail/src/usersmtp.c                        1.1.1.18.4.1
  src/contrib/sendmail/src/util.c                            1.1.1.17.4.1
  src/UPDATING                                            1.342.2.13.2.31
  src/sys/conf/newvers.sh                                  1.62.2.15.2.33
RELENG_6
  src/contrib/sendmail/libsm/fflush.c                        1.1.1.3.14.1
  src/contrib/sendmail/libsm/local.h                          1.1.1.7.8.1
  src/contrib/sendmail/libsm/refill.c                         1.1.1.5.8.1
  src/contrib/sendmail/src/collect.c                         1.1.1.21.2.1
  src/contrib/sendmail/src/conf.c                                1.28.2.1
  src/contrib/sendmail/src/deliver.c                         1.1.1.23.2.1
  src/contrib/sendmail/src/headers.c                             1.21.2.1
  src/contrib/sendmail/src/mime.c                            1.1.1.13.2.1
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.22.2.1
  src/contrib/sendmail/src/savemail.c                            1.17.2.1
  src/contrib/sendmail/src/sendmail.h                        1.1.1.26.2.1
  src/contrib/sendmail/src/sfsasl.c                          1.1.1.15.2.1
  src/contrib/sendmail/src/sfsasl.h                          1.1.1.4.14.1
  src/contrib/sendmail/src/srvrsmtp.c                        1.1.1.22.2.1
  src/contrib/sendmail/src/usersmtp.c                        1.1.1.21.2.1
  src/contrib/sendmail/src/util.c                            1.1.1.18.2.1
RELENG_6_0
  src/contrib/sendmail/libsm/fflush.c                        1.1.1.3.16.1
  src/contrib/sendmail/libsm/local.h                         1.1.1.7.10.1
  src/contrib/sendmail/libsm/refill.c                        1.1.1.5.10.1
  src/contrib/sendmail/src/collect.c                         1.1.1.21.4.1
  src/contrib/sendmail/src/conf.c                                1.28.4.1
  src/contrib/sendmail/src/deliver.c                         1.1.1.23.4.1
  src/contrib/sendmail/src/headers.c                             1.21.4.1
  src/contrib/sendmail/src/mime.c                            1.1.1.13.4.1
  src/contrib/sendmail/src/parseaddr.c                       1.1.1.22.4.1
  src/contrib/sendmail/src/savemail.c                            1.17.4.1
  src/contrib/sendmail/src/sendmail.h                        1.1.1.26.4.1
  src/contrib/sendmail/src/sfsasl.c                          1.1.1.15.4.1
  src/contrib/sendmail/src/sfsasl.h                          1.1.1.4.16.1
  src/contrib/sendmail/src/srvrsmtp.c                        1.1.1.22.4.1
  src/contrib/sendmail/src/usersmtp.c                        1.1.1.21.4.1
  src/contrib/sendmail/src/util.c                            1.1.1.18.4.1
  src/UPDATING                                             1.416.2.3.2.11
  src/sys/conf/newvers.sh                                    1.69.2.8.2.7
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0058

The latest revision of this advisory is available at
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:13.sendmail.asc
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