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CERT(sm) Advisory CA-93:16a
Original issue date: January 7, 1994
Last revised: August 30, 1996
Information previously in the README was put into the advisory.
NOTE: SUPERSEDED BY CA-95:05 on February 22, 1995
Topic: Sendmail Vulnerability - supplementary advisory containing vendor
patch information
- -----------------------------------------------------------------------------
*** THIS ADVISORY IS SUPERSEDED BY CA-95:05. ***
The CERT Coordination Center is continuing to work with vendors on
eliminating a group of vulnerabilities in sendmail(8). These vulnerabilities
include those related to mailing to a program, mailing to a file, and a
few others.
This advisory provides information about new patches available from
some vendors. At the time that CA-93:16.sendmail.vulnerability was published
a set of workarounds were provided. These workarounds should still be used
until vendor patches are available. Once the vendor patches have been
installed, sites should continue to use smrsh.
CERT/CC has provided detailed information about all known vulnerabilities
in sendmail to all of our vendor contacts. If your vendor is unaware of
the problems, or if they have any questions, please have them contact us.
Information about available patches as well as information on
upcoming patches is provided in Appendix A below.
Note:
You should run smrsh with any UNIX system that is running sendmail,
regardless of vendor or version. Even with Eric Allman's sendmail version
8.6.12, it is necessary for security-conscious sites to use the smrsh program,
as this carries out preprocessing of mail headers and adds an extra layer of
defense by controlling what programs can be spawned by the incoming mail
message. Note that smrsh has now been included as part of the sendmail
distribution (effective with 8.7).
We also urge you to ensure that all patches are installed for the distribution
of sendmail you are using. Regardless of the vendor or version of your UNIX
systems and sendmail, the general advice to "run the smrsh tool in conjunction
with the most recently patched version of sendmail for your system" holds
true.
..............................................................................
Appendix A
The following is vendor-supplied information. Please notice that
some entries provide pointers to vendor advisories. For more up-to-date
information, contact your vendor.
- -------------
Eric Allman, 8.6.8.1
Version 8.6.8.1 is available for anonymous FTP from ftp.cs.berkeley.edu
in the "ucb/sendmail" directory.
Standard Unix Sum
sendmail.8.6.8.base.tar.Z: 05865 486
System V Sum
57100 972 sendmail.8.6.8.base.tar.Z
MD5 Checksum
MD5 (sendmail.8.6.8.base.tar.Z) = 5cacff3e069ae4885402991e1e270386
- -------------
Paul Pomes, IDA:
A new release is available for anonymous FTP from vixen.cso.uiuc.edu
as "pub/sendmail-5.67b+IDA-1.5.tar.gz".
Standard Unix Sum
sendmail-5.67b+IDA-1.5.tar.gz: 17272 1341
System V Sum
30425 2682 sendmail-5.67b+IDA-1.5.tar.gz
MD5 Checksum
MD5 (sendmail-5.67b+IDA-1.5.tar.gz) = a9b8e17fd6d3e52739d2195cead94300
- -------------
BSDI
BSDI can supply either an easy-to-install port of the smrsh patch from
CERT or a port of sendmail-8.6.4 (contact BSDI Customer Support for
information in obtaining either of these solutions). In future
releases, BSDI will ship the newer sendmail that is not affected
by these problems. Releases affected by this advisory: BSD/386 V1.0.
BSDI Contact Information:
BSDI Customer Support
Berkeley Software Design, Inc.
7759 Delmonico Drive
Colorado Springs, CO 80919
Toll Free: +1 800 ITS BSD8 (+1 800 486 2738)
Phone: +1 719 260 8114
Fax: +1 719 598 4238
Email: support@bsdi.com
- -------------
Data General Corporation
Patches are available from dg-rtp.rtp.dg.com (128.222.1.2) in
the directory "deliver/sendmail":
Rev Patch Number Sys V Checksum
------------ ------------------ --------
5.4.2 tcpip_5.4.2.p14 39298 512
MD5 (tcpip_5.4.2.p14) = c80428e3b791d4e40ebe703ba5bd249c
5.4R2.01 tcpip_5.4R2.01.p12 65430 512
MD5 (tcpip_5.4R2.01.p12) = 9c84cfdb4d79ee22224eeb713a414996
5.4R2.10 tcpip_5.4R2.10.p05 42625 512
MD5 (tcpip_5.4R2.10.p05) = 2d74586ff22e649354cc6a02f390a4be
These patches are loadable via the "syadm" utility and installation
instructions are included in the patch notes.
Trusted versions of DG/UX will use the same patches as
their base version of DG/UX.
Customers with any questions about these patches should contact
their local SEs or Sales Representatives.
- -------------
Digital Equipment Corporation
Systems affected: ULTRIX Versions 4.3 (VAX), ULTRIX V4.3 & V4.3A (RISC),
DEC OSF/1 V1.2 & V1.3, using sendmail. The following patches are
available from your normal Digital support channel:
ULTRIX V4.3 (VAX), V4.3 (RISC) or V4.3a (RISC): CSCPAT #: CSCPAT_4044
OSF/1 V1.2 and V1.3: CSCPAT #: CSCPAT_4045
*These fixes will be included in future releases of ULTRIX and DEC OSF/1
Digital Equipment Corporation strongly urges Customers to upgrade
to a minimum of ULTRIX V4.3 or DEC OSF/1 V1.2, then apply the
Security kit to prevent this potential vulnerability.
The full text of Digital's advisory can be found in
/pub/vendors/dec/advisories/sendmail on info.cert.org.
- -------------
Hewlett-Packard Company
For HP/UX, the following patches are available:
PHNE_3369 (series 300/400, HP-UX 8.x), or
PHNE_3370 (series 300/400, HP-UX 9.x), or
PHNE_3371 (series 700/800, HP-UX 8.x), or
PHNE_3372 (series 700/800, HP-UX 9.x), or
modify the sendmail configuration file (releases of HP-UX
prior to 8.0)
These patches may be obtained from HP via FTP (this is NOT
anonymous FTP) or the HP SupportLine. To obtain HP security
patches, you must first register with the HP SupportLine.
The registration instructions are available via
anonymous FTP at info.cert.org in the file
"pub/vendors/hp/supportline_and_patch_retrieval".
The full text of Hewlett-Packard's advisory can be found in
/pub/vendors/hp/advisories/sendmail on info.cert.org.
- -------------
IBM
Patches for these problems can be ordered as APAR# ix40304 and
APAR# ix41354. Ix40304 is available now and ix41354 will be
sent as soon as it is available.
- -------------
NeXT, Inc.
A patch is available via anonymous FTP from FTP.NEXT.COM in the
directory "/pub/NeXTanswers/Files/Patches/SendmailPatch.23950.1".
Filename Checksum
--------------------------------- ---------
1513_SendmailPatch.ReadMe.rtf 63963 4
MD5 checksum = 8f561a9bdeb11bc0e0201874dbb7c234
1514_SendmailPatch.pkg.compressed 02962 290
MD5 checksum = 8c33f32bb4e96f5a9938298ed15ef940
This patch is also available via electronic mail by sending a message
to NeXTanswers@NeXT.com with a subject line of "1513 1514". The two
files noted above will be returned as NeXTmail attachments.
This patch is for NEXTSTEP 3.1 and NEXTSTEP 3.2. Instructions for
installing this patch are included in the ReadMe file.
Questions about this patch should be directed to NeXT's Technical
Support Hotline (1-800-848-NeXT) or via email to ask_next@NeXT.com.
- -------------
The Santa Cruz Operation
Support level Supplement (SLS) net379A, is available
for the following platforms:
SCO TCP/IP Release 1.2.0 for SCO UNIX or SCO XENIX
SCO TCP/IP Release 1.2.1 for SCO UNIX
SCO Open Desktop Release 2.0, 3.0
SCO Open Desktop Lite Release 3.0
SCO Open Server Network System, Release 3.0
SCO Open Server Enterprise System, Release 3.0
This SLS is currently available for anonymous ftp download from
ftp.sco.COM, (132.147.106.6). The files to download are:
file name sum -r
======================================
/SLS/net379a.Z 59954 562 <- Supplement file
/SLS/net379a.ltr.Z 19608 6 <- cover letter
/SLS/README <- general info on how to copy Supplement
file to diskette before installing
Standard Unix Sum
/SLS/net379a.Z: 59954 281
/SLS/net379a.ltr.Z: 19608 3
MD5 Checksum
MD5 (/SLS/net379a.Z) = 280c989029f0c8cecefa1f7a397971ff
MD5 (/SLS/net379a.ltr.Z) = 71d764c68263cb4d0b94ccaf1c4818ab
This SLS is also available for UUCP download from the machines
listed below. The file names are:
/usr/spool/uucppublic/SLS/net379a.Z
/usr/spool/uucppublic/SLS/net379a.ltr.Z
/usr/spool/uucppublic/SLS/info (same as README file above)
USA, Canadian, Pacific Rim, Asia, and Latin American customers:
---------------------------------------------------------------
Machine name: sosco
UUCP user: uusls (no password)
Modem Phone numbers:
Telebit Trailblazer Plus 408-429-1786 9600 baud
Telebit 1500 V.32, 2@ 408-425-3502 2400, 9600 baud
Hayes V Series 9600, 2@ 408-427-4470 9600 baud
for Europe, the Middle East, and Africa:
----------------------------------------
Machine name: scolon
UUCP user: uusls
Password: bbsuucp
Modem Phone numbers:
Dowty Trailblazer +44 (0)923 210911
Hardcopy versions of SLS net379A should also be available from your
Support provider, or SCO. If you need to contact SCO to order this
SLS, please do so as follows:
Electronic mail: support@sco.COM
The Americas, Pacific Rim, Asia, and Latin America:
6am-5pm Pacific Standard Time (PST)
---------------------------------------------------
1-408-425-4726 (voice)
1-408-427-5443 (fax)
Europe, Middle East, Africa: 9am-5:30pm British Standard Time (BST)
----------------------------
+44 (0)923 816344 (voice)
+44 (0)923 817781 (fax)
- -------------
Sequent Computer Systems
Versions 3.0.17 and greater of Dynix are vulnerable
as are versions 2.2 and 2.3 of the TCP package for PTX.
Sequent customers should call the Sequent Hotline at
(800) 854-9969 and ask for the Sendmail Maintenance Release Tape.
Alternatively, ptx customers can upgrade to PTX/TCP/IP
version 2.2.3 or 2.3.1 as appropriate.
- -------------
Silicon Graphics, Inc.
The sendmail vulnerabilities are fixed in IRIX 5.1.1.3 and later
systems. Patches for IRIX 4.* and IRIX 5.* systems are available
via anonymous FTP from ftp.sgi.com (192.48.153.1) in the directory
"sgi/IRIX4.0/sendmail" or "sgi/IRIX5.0/sendmail", respectively.
In each directory are four files:
README - describes the other files
sendmail.latest - replacement sendmail binary
sendmail.cf.latest - sample configuration file
sendmail.cf.auto.latest - sample auto configuration file
The sendmail.cf.* files are provided for completeness.
Sites should be able to continue to use their locally modified
sendmail.cf files.
Customers without Internet access should contact the support
center for their country using the procedures outlined in
their maintenance agreement for a new sendmail binary.
A. IRIX4.0/sendmail/
Filename BSD SVR4
Checksum Checksum
--------------- --------- ---------
README 10278 2 63012 4
MD5 (IRIX4.0/README) = 13a8ae43cb0d63a165fd48dccf2f45a5
sendmail.cf.auto.latest 35252 34 52100 67
MD5 (IRIX4.0/sendmail.cf.auto.latest) = acec5e81cc6c2119a553dea6bdd9a937
sendmail.cf.latest 38770 32 20186 6
MD5 (IRIX4.0/sendmail.cf.latest) = 59a60c6602633688dd4bf6af51d63894
sendmail.latest 19044 580 50838 1160
MD5 (IRIX4.0/sendmail.latest) = 358d6930187ba2750e59c66204a9a9c9
B. IRIX5.0/sendmail/
Filename BSD SVR4
Checksum Checksum
--------------- --------- ---------
README 05005 2 30863 3
MD5 (IRIX5.0/README) = b5166089628b8da019c04d33141840a3
sendmail.cf.auto.latest 42039 34 58171 67
MD5 (IRIX5.0/sendmail.cf.auto.latest) = f11fc9739e67315a218217835bb6328e
sendmail.cf.latest 47744 32 26263 64
MD5 (IRIX5.0/sendmail.cf.latest) = 75d09eeffc3980e43c6f3764d227e6d6
sendmail.latest 47861 918 48212 1836
MD5 (IRIX5.0/sendmail.latest) = e64fb2296a93d49511c1bb5da994a4fb
- -------------
Solbourne Computer, Inc.
Patch p93122301 is available from Solbourne to fix the sendmail
problems. This patch is equivalent to Sun patch 100377-08.
Customers may retrieve it via anonymous FTP from
solbourne.solbourne.com in the pub/support/OS4.1B directory:
Filename BSD SVR4
Checksum Checksum
--------------- --------- ---------
p93122301.tar.Z 63749 211 53951 421
MD5 (p93122301.tar.Z) = f7300f3ecfbbbfaa11a6695f42f14615
It is also available by sending email to solis@solbourne.com
and specifying "get patches/4.1b p93122301" in the body of the
mail message.
Earlier versions (4.1A.*) are no longer supported. The 4.1B
patch may well work on 4.1A.* systems but this has not been tested.
If you have any questions please call the SOURCE at 1-800-447-2861 or
send email to support@solbourne.com.
The full text of Solbourne's advisory can be found in
/pub/vendors/solbourne/advisories/sendmail on info.cert.org.
- ---------------
Sony Corporation
These vulnerabilities have been fixed in NEWS-OS 6.0.1.
A patch is available for NEWS-OS 4.x. Customers should
contact their dealers for any additional information.
- ---------------
Sun Microsystems, Inc.
Sun has made patches for sendmail available as described in
their SUN MICROSYSTEMS SECURITY BULLETIN: #00125, 12/23/93.
These patches can be found in the
/systems/sun/sun-dist directory on ftp.uu.net:
System Patch ID Filename BSD SVR4
Checksum Checksum
------ -------- --------------- --------- ---------
SunOS 4.1.x 100377-08 100377-08.tar.Z 05320 755 58761 1510
Solaris 2.1 100840-06 100840-06.tar.Z 59489 195 61100 390
Solaris 2.2 101077-06 101077-06.tar.Z 63001 179 28185 358
Solaris 2.3 101371-03 101371-03.tar.Z 27539 189 51272 377
MD5 checksums are:
MD5 (100377-08.tar.Z) = 8e8a14c0a46b6c707d283cacd85da4f1
MD5 (100840-06.tar.Z) = 7d8d2c7ec983a58b4c6a608bf1ff53ec
MD5 (101077-06.tar.Z) = 78e165dec0b8260ca6a5d5d9bdc366b8
MD5 (101371-03.tar.Z) = 687d0f3287197dee35941b9163812b56
A patch for x86 based systems will be forthcoming as patch 101352-02.
4.1 sites installing these patches may require sites to modify
their configuration files slightly. Full details are given in
the Sun advisory.
The full text of Sun Microsystems's advisory can be found in
/pub/vendors/sun/advisories/sendmail on info.cert.org.
- -----------------------------------------------------------------------------
The CERT Coordination Center wishes to thank all the vendors for
recognizing the importance of these vulnerabilities and responding
to them.
- ---------------------------------------------------------------------------
If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in Forum of Incident
Response and Security Teams (FIRST).
Internet E-mail: cert@cert.org
Telephone: 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4),
and are on call for emergencies during other hours.
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories, information about FIRST representatives, and other
information related to computer security are available for anonymous
FTP from info.cert.org.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Revision history
Aug. 30, 1996 Information previously in the README was inserted
into the advisory. A summary list of vendor names was
removed from the body of the advisory.
July 25, 1996 Introduction - changed statement about using smrsh to say that
sites should continue to use it after installing vendor patches.
Feb. 22, 1995 This advisory was further superseded by CA-95:05.
July 14, 1994 This advisory was superseded by CA-94:12.
Nov. 07, 1994 Immediately before the appendix - added a note about smrsh.
-- Appendix - updated vendor information as it was received.
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