SSRT3531 Potential Security Vulnerability in sendmail (rev.5)
From: Security Alert (secure_at_cup.hp.com)
Date: 05/21/03
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Date: 21 May 2003 07:39:19 -0700
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**REVISED 05**
Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0304-253
Originally issued: 03 April 2003
Last revised: 20 May 2003
SSRT3531 Potential Security Vulnerability in sendmail (rev.5)
-----------------------------------------------------------------
NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.
The information in the following Security Bulletin should be
acted upon as soon as possible. Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.
-----------------------------------------------------------------
PROBLEM: Potential security vulnerability in sendmail
IMPACT: Potential unauthorized Privileged Access,
Potential Denial of Service (DoS).
PLATFORM: HP 9000 Series 700/800 Servers running HP-UX 10.10,
10.20, 11.00, 11.04(VVOS), 11.11, and 11.22.
SOLUTION: Download and install the appropriate files or the
HPSecurityBul253.depot.
The sendmail files and HPSecurityBul253.depot
referenced in HPSBUX0304-253 also address the
issues documented in HPSBUX0302-246.
If the sendmail files or HPSecurityBul253.depot
from HPSBUX0304-253 are installed, it is not necessary
to install the sendmail files or HPSecurityBul246.depot
from HPSBUX0302-246.
If both sets of sendmail files, or both depots, are
installed, the sendmail files or HPSecurityBul253.depot
from HPSBUX0304-253 must be installed *AFTER* the
sendmail files or HPSecurityBul246.depot from HP
HPSBUX0302-246 in order to ensure all issues are
addressed.
MANUAL ACTIONS: Yes - NonUpdate
Download and install the appropriate
sendmail file, depot, or preliminary patch.
AVAILABILITY: Fixes are available for 10.10, 10.20, 11.00,
11.04(VVOS), 11.11, and 11.22.
CHANGE SUMMARY: Rev.01 - Added fix for 11.22.
Added HPSecurityBul253.depot.
CHANGE SUMMARY: Rev.02 - Corrected filename:
/usr/newconfig/etc/mail/sendmail.cf
Added sendmail.886.10.10.r1.
Rev.03 - New HPSecurityBul253.depot containing
sendmail.886.10.10.r1.
Rev.04 - Added early release patches for 11.00
and 11.11.
Rev.05 - Added pre-release sendmail-8.11.1 web
upgrades for 11.00 and 11.11.
-----------------------------------------------------------------
A. Background
A potential security vulnerability with sendmail has been
reported in HP-UX. This potential vulnerability may result
in unauthorized Privileged Access or a Denial of Service
(DoS). This potential vulnerability may be exploited
remotely.
This is the vulnerability reported in CERT/CC CA-2003-12.
Note: In order to provide fixes as soon as possible manually
installed files are being provided initially. A depot
and patches containing these files will be provided as
soon as they can be created.
A depot (HPSecurityBul253.depot) is now available.
Note: This problem also affects:
HP Tru64 UNIX/TruCluster Server V4.x and V5.x
HP Tru64 UNIX Engineering continues to work this
issue at the highest priority.
As solution information becomes available HP
will provide notice of the availability of any
necessary patches through standard security
bulletin announcements and be available from your
normal HP Services support channel.
The HP Tru64 bulletin will be posted to the customer
support website within 24 hours of release to -
http://thenew.hp.com/country/us/eng/support.html
or www.hp.com
Use the SEARCH IN feature box, enter SSRT in the
search window or use a specific SSRT #
(example: SSRT3531)
HP ProLiant Servers
If running Open Source Sendmail, refer to the following
Sendmail Consortium URL for patch details or upgrades:
http://www.sendmail.org
As more information becomes available HP
will provide notice of the availability of any
necessary patches through standard security
bulletin announcements and be available from your
normal HP Services support channel.
NOT VULNERABLE:
HP NonStop Servers
HP OpenVMS.
B. Recommended solution
**REVISED 05**
-> Currently there are several ways to install solutions
-> depending on the version of HP-UX and the version of
-> sendmail installed:
-> HP-UX 11.00 and 11.11 sendmail 8.11.1
-> A pre-release web upgrade is available from the ftp site.
-> Details are below.
-> HP-UX 11.00 and 11.11 sendmail 8.9.3
-> A preliminary patch a available from a temporary
-> ftp site. Details are below.
-> All versions (including those mentioned above)
-> A depot is available from a temporary ftp
-> site. Details are below.
-> All versions (including those mentioned above)
-> Individual files are available from a temporary
-> ftp site. Details are below. The files are
-> included in the depot. We recommend using the
-> depot rather than manually installing individual
-> files.
-> Note: It is recommended that an available
-> preliminary patch or pre-release web upgrade be
-> installed rather than the depot.
-> However, the depot contains all the
-> available fixes and will automatically
-> install the correct version. If there
-> are a variety of HP-UX versions to be
-> fixed the depot may prove easier to
-> implement than the preliminary patches
-> or the pre-release web upgrades.
Note: The fixes mentioned here include the fix for
for HPSBUX0302-246. The files are named to be
consistent with the names used in HPSBUX0302-246.
For example, HPSBUX0302-246 provided
sendmail.811.11.11.r1. This bulletin provides
sendmail.811.11.11.r2.
All versions of sendmail provided by HP on HP-UX
10.X and 11.X are vulnerable unless one of the
fixes described below has been installed.
Note: All the files mentioned for download below are
available from the following ftp site:
System: hprc.external.hp.com (192.170.19.51)
Login: sendmail
Password: sendmail
FTP Access: ftp://sendmail:sendmail@hprc.external.hp.com/
or: ftp://sendmail:sendmail@192.170.19.51/
or: ftp hprc.external.hp.com
Note: There is an ftp defect in IE5 that may result in
a browser hang. To work around this:
- Select Tools -> Internet Options -> Advanced
- Un-check the option:
[ ] Enable folder view for FTP sites
**REVISED 05**
-> ==================================================
-> Note: A pre-release web upgrade is available for
-> sendmail 8.11.1 on 11.00 and 11.11.
-> ==================================================
-> To fix the problem on 11.00 or 11.11 for
-> sendmail 8.11.1 with a pre-release web upgrade:
-> 1. Determine the sendmail version.
-> Login in as root:
-> cd /usr/sbin
-> sendmail -d0.1 < /dev/null | grep -i version
-> The display will show Version #.#.#
-> 2. If the version is 8.11.1 on HP-UX 11.00 or HP-UX 11.11
-> you can install a pre-release web upgrade . If you
-> prefer to use the HPSecurityBul253.depot, please skip
-> to the "To fix the problem by installing files or a depot"
-> section below.
-> 3. Download the appropriate files:
-> 11.00
-> =====
-> sendmail-811_01.03.text
-> sendmail-811_01.03.depot.gz
-> 11.11
-> =====
-> sendmail-811_01.04.text
-> sendmail-811_01.04.depot.gz
-> 4. Unpack and verify the chsum or md4 sum:
-> cksum:
-> 1509599411 2795520 sendmail-811_01.03.depot
-> 3258266392 32919 sendmail-811_01.03.text
-> 2491735420 2856960 sendmail-811_01.04.depot
-> 1645106949 34290 sendmail-811_01.04.text
-> MD5 (sendmail-811_01.03.depot) =
-> 6c284f2efa81143edc7a82f3f6cad3dc
-> MD5 (sendmail-811_01.03.text) =
-> 7f843101dbacf917126a4ba26f7e3cc9
-> MD5 (sendmail-811_01.04.depot) =
-> 375895a4fd8153206749aa4f16321509
-> MD5 (sendmail-811_01.04.text) =
-> e5fd4ef3dd48e154c8f93f6424152c37
-> 5. Install the appropriate depot with swinstall.
==================================================
Note: Preliminary patches are available for
sendmail 8.9.3 on 11.00 and 11.11.
==================================================
To fix the problem on 11.00 or 11.11 for
sendmail 8.9.3 with a preliminary patch:
1. Determine the sendmail version.
Login in as root:
cd /usr/sbin
sendmail -d0.1 < /dev/null | grep -i version
The display will show Version #.#.#
2. If the version is 8.9.3 on HP-UX 11.00 or HP-UX 11.11
you can install a preliminary patch. If you prefer to
use the HPSecurityBul253.depot, please skip to the
"To fix the problem by installing files or a depot"
section below.
3. To install the preliminary patch, download
11.00 - PHNE_26304.depot.gz and PHNE_26304.text.
11.11 - PHNE_28761.depot.gz and PHNE_28761.text.
from the hprc.external.hp.com ftp site (above).
4. Unpack PHNE_26304.depot.gz or PHNE_28761.depot.gz
and verify the cksum or md5 sum.
cksum:
949513726 2703360 PHNE_26304.depot
1059185552 62024 PHNE_26304.text
2495035056 1873920 PHNE_28761.depot
4120361607 14324 PHNE_28761.text
MD5 (PHNE_26304.depot) = 4d0231117ee1d336b0d6c2a3b552847f
MD5 (PHNE_26304.text) = 3f7f2b250cc135acac52cd1ebf18d826
MD5 (PHNE_28761.depot) = 1a4c4b8ed605205df503f6fce1e49099
MD5 (PHNE_28761.text) = 6b2d71e49fa674c9e75f4bf316257bb8
5. Install PHNE_26304.depot or PHNE_28761.depot.
The normal patch installation instructions are in
PHNE_26304.text or PHNE_28761.text.
6. Modify /etc/mail/sendmail.cf
Add "restrictqrun" to the PrivacyOptions.
After the change the line should read:
O PrivacyOptions=authwarnings,restrictqrun
7. Restart sendmail.
Execute the following commands
killsm
/sbin/init.d/sendmail start
Note: Do not execute the command above for VVOS 11.04
The command runs sendmail as a daemon, which is
not supported by VVOS (Virtual Vault Operating
System).
==================================================
To fix the problem by installing files or a depot:
1. Determine the sendmail version.
2. If necessary upgrade to a version of sendmail
for which a fix is available. Existing 8.11.1
versions MUST be updated to the versions listed
below or subsequent.
3. Modify sendmail.cf.
EITHER
4. Download and install HPSecurityBul253.depot.gz.
OR
5. Download and install the appropriate sendmail
and killsm files.
Details:
1. Determine the sendmail version.
Login in as root:
cd /usr/sbin
sendmail -d0.1 < /dev/null | grep -i version
The display will show Version #.#.#
2. If necessary upgrade to a version of sendmail
for which a fix is available.
Fixes are available for the following versions:
HP-UX 10.10: sendmail 8.8.6
HP-UX 10.20: sendmail 8.9.3
HP-UX 11.00: sendmail 8.11.1
HP-UX 11.00: sendmail 8.9.3
VVOS 11.04: sendmail 8.9.3
HP-UX 11.11: sendmail 8.11.1
HP-UX 11.11: sendmail 8.9.3
HP-UX 11.22: sendmail 8.11.1
Note: Existing sendmail 8.11.1 on 11.00 and 11.11
MUST be updated to the versions listed below.
If you are not running one the those versions,
you will need to upgrade as follows:
HP-UX 10.10
Upgrade to 8.8.6 by installing the web upgrade
available on:
http://www.software.hp.com/products/
Sendmail/index.html
This is a direct link to the 8.8.6 upgrade.
HP-UX 10.20
Upgrade to 8.9.3 by installing PHNE_25183.
HP-UX 11.00
Upgrade to 8.9.3 by by installing PHNE_24419.
OR
Upgrade to 8.11.1 by installing the web upgrade
available on http://www.software.hp.com
Sendmail 8.11.1 Version 2 (B.11.00.01.002) released in March 2003
VVOS 11.04 (Virtual Vault Operating System):
Upgrade to 8.9.3 by installing PHNE_25984.
Note: VVOS does not support the web upgrade version
of sendmail 8.11.1.
HP-UX 11.11
Upgrade to 8.11.1 by installing the web upgrade
available on http://www.software.hp.com
Sendmail 8.11.1 Version 3 (B.11.11.01.003) released in March 2003
3. Modify sendmail.cf
Add "restrictqrun" to the PrivacyOptions.
After the change the line should read:
O PrivacyOptions=authwarnings,restrictqrun
This change has already been made in the
/usr/newconfig/etc/mail/sendmail.cf file delivered with
the new 8.11.1.
For 8.9.3 the change must be made in the
/usr/newconfig/etc/mail/sendmail.cf file.
For both 8.9.3 and 8.11.1 the change must be made in
the /etc/mail/sendmail.cf file.
Note: Perform either step 4 or step 5.
4. Download and install HPSecurityBul253.depot.gz:
a. Download HPSecurityBul253.depot.gz
b. Unpack the file with gunzip(1)
c. Verify the cksum or the md5 sum.
cksum HPSecurityBul253.depot
2957204051 7260160 HPSecurityBul253.depot
md5 HPSecurityBul253.depot
MD5 (HPSecurityBul253.depot) =
2f27f01675c92b14e000fe2c59d5f684
Note: The previous version of HPSecurityBul253.depot
did not contain sendmail.886.10.10.r1.
If the 10.10 solution is not required the
previous version of HPSecurityBul253.depot
can be used. It is no longer available on
the ftp site. The previous version has the
following cksum and md5:
cksum HPSecurityBul253.depot
3387599586 6860800 HPSecurityBul253.depot
md5 HPSecurityBul253.depot
MD5 (HPSecurityBul253.depot) =
d5019256abfa93e034eeccc319df11ef
d. Extract the "readme" file for further information:
cd directory_containing_depot
swlist -d -l product -a readme
@ $PWD/HPSecurityBul253.depot
e. Install HPSecurityBul253.depot with swinstall(1).
5. Download and install the appropriate file.
a. Download the appropriate file(s).
For HP-UX 10.10: sendmail.886.10.10.r1.gz for 8.8.6
For HP-UX 10.20: sendmail.893.10.20.r1.gz for 8.9.3
killsm.893.10.20 for 8.9.3
For HP-UX 11.00: sendmail.811.11.00.r1.gz for 8.11.1
sendmail.893.11.00.r1.gz for 8.9.3
killsm.893.11.00 for 8.9.3
For HP-UX 11.04: sendmail.893.11.00.r1.gz for 8.9.3
killsm.893.11.00 for 8.9.3
For HP-UX 11.11: sendmail.811.11.11.r2.gz for 8.11.1
sendmail.893.11.11.r1.gz for 8.9.3
killsm.893.11.11 for 8.9.3
For HP-UX 11.22: sendmail.811.11.22.r1.gz for 8.11.1
killsm.811.11.22 for 8.11.1
Note: Because of changes to sendmail a new version of
killsm is required. The new version is included
in the latest web upgrade for 8.11.1 on 11.00 amd
11.11. Since there is no web upgrade for 8.11.1
on 11.22, the killsm.811.11.22 is needed.
b. Unpack the file with gunzip(1)
c. Verify the cksum or the md5 sum.
2985469994 401408 sendmail.886.10.10.r1
2336630777 811008 sendmail.893.10.20.r1
3989146179 1042 killsm.893.10.20
342459522 831488 sendmail.893.11.00.r1
2688504642 1052 killsm.893.11.00
3227626308 970752 sendmail.811.11.00.r1
3541980035 864256 sendmail.893.11.11.r1
651707972 1053 killsm.893.11.11
3137083796 1015808 sendmail.811.11.11.r2
23403750 2312460 sendmail.811.11.22.r1
3188566214 1191 killsm.811.11.22
Note: If you wish to verify the md5 sum and you do not
have a copy of md5, please refer to:
HPSBUX9408-016
Patch sums and the MD5 program
Note: Using your itrc account security bulletins can be
found here:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin
MD5 (sendmail.886.10.10.r1) = 484daf04bf70246459ce73317a8617b3
MD5 (sendmail.893.10.20.r1) = 6fdfd434b5a1c90907dc1149f8e7e5b2
MD5 (killsm.893.10.20) = 8aebbdb41ee527d8bae398a5feda82dd
MD5 (sendmail.893.11.00.r1) = ae011668557a64d93d5b683380332b8d
MD5 (killsm.893.11.00) = 4eb6f978de78540790487931b8f43eb1
MD5 (sendmail.811.11.00.r1) = 99b9c6f895fef1b923500df158f01678
MD5 (sendmail.893.11.11.r1) = 3be01a159408fa1090d1f7aafe822c88
MD5 (killsm.893.11.11) = a2c24f912bcf84ffb9dbb92620cac020
MD5 (sendmail.811.11.11.r2) = afe970b69d99a73faf7808917115f11f
MD5 (sendmail.811.11.22.r1) = dbae99173b44bc5b9698a009456345af
MD5 (killsm.811.11.22) = 3f456a09a76692fb0e77fe2cdb38e5f7
d. Install the appropriate file as follows:
Copy the appropriate sendmail file to a protected directory
such as /usr/sbin. If you are running sendmail 8.9.3 also
copy the appropriate killsm file to a protected directory
such as /usr/sbin.
Login as root and run killsm:
killsm
Verify the sendmail daemon is not running:
ps -ef | grep sendmail
If you are running the 8.9.3 version of sendmail
replace killsm as follows:
cd /usr/sbin
cp killsm killsm.orig
cp killrm.893.10.20 killsm
OR
cp killrm.893.11.00 killsm
OR
cp killrm.893.11.11 killsm
If you are running 11.22:
cd /usr/sbin
cp killsm killsm.orig
cp killrm.811.11.22 killsm
For all versions of sendmail,
make a backup copy of the existing sendmail:
cd /usr/sbin
cp sendmail sendmail.original
Note the permissions for reference:
ls -lia /usr/sbin/sendmail
Install the new sendmail:
cp sendmail.xxx.yy.zz.rn sendmail
For example, on 11.11:
cp sendmail.811.11.11.r2 sendmail
Restart sendmail.
If you were running sendmail before the killsm
command above, you can now restart it with the
following command (for HP-UX, not VVOS):
/sbin/init.d/sendmail start
Note: Do not execute the command above for VVOS 11.04
The command runs sendmail as a daemon, which is
not supported by VVOS (Virtual Vault Operating
System).
End of Step 5.
==================================================
Note: If you receive either of the following messages after
applying the fix, please follow the recommended action.
warning: /etc/mail/aliases has world read or
write permission. This is unsafe.
warning: /etc/mail/aliases.db has world read or
write permission. This is unsafe.
Recommended action
Execute the following commands.
chmod 640 /etc/mail/aliases
chmod 640 /etc/mail/aliases.db
sendmail -bi
C. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic
mail, do the following:
Use your browser to get to the HP IT Resource Center page
at:
Use the 'Login' tab at the left side of the screen to login
using your ID and password. Use your existing login or the
"Register" button at the left to create a login, in order to
gain access to many areas of the ITRC. Remember to save the
User ID assigned to you, and your password.
In the left most frame select "Maintenance and Support".
Under the "Notifications" section (near the bottom of
the page), select "Support Information Digests".
To -subscribe- to future HP Security Bulletins or other
Technical Digests, click the check box (in the left column)
for the appropriate digest and then click the "Update
Subscriptions" button at the bottom of the page.
or
To -review- bulletins already released, select the link
(in the middle column) for the appropriate digest.
NOTE: Using your itrc account security bulletins can be
found here:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin
To -gain access- to the Security Patch Matrix, select
the link for "The Security Bulletins Archive". (near the
bottom of the page) Once in the archive the third link is
to the current Security Patch Matrix. Updated daily, this
matrix categorizes security patches by platform/OS release,
and by bulletin topic. Security Patch Check completely
automates the process of reviewing the patch matrix for
11.XX systems.
For information on the Security Patch Check tool, see:
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
displayProductInfo.pl?productNumber=B6834AA
The security patch matrix is also available via anonymous
ftp:
ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/
On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".
The PGP key used to sign this bulletin is available from
several PGP Public Key servers. The key identification
information is:
2D2A7D59
HP Security Response Team (Security Bulletin signing only)
<security-alert@hp.com>
Fingerprint =
6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59
If you have problems locating the key please write to
security-alert@hp.com. Please note that this key is
for signing bulletins only and is not the key returned
by sending 'get key' to security-alert@hp.com.
D. To report new security vulnerabilities, send email to
security-alert@hp.com
Please encrypt any exploit information using the
security-alert PGP key, available from your local key
server, or by sending a message with a -subject- (not body)
of 'get key' (no quotes) to security-alert@hp.com.
-----------------------------------------------------------------
(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company. Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.
_________________________________________________________________
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-- Yours truly, HP S/W Security Team WTEC Cupertino, California Return-Path: secure@cup.hp.com Reply-to: security-alert@hp.com
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