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Home » Hacking News » Hewlett Packard HPSBUX0304-253: sendmail buffer overflow

Hewlett Packard HPSBUX0304-253: sendmail buffer overflow

by Nikola Strahija on April 6th, 2003 A buffer overflow vulnerability has been found in sendmail versions 8.12.8 and below which, if exploited, can allow remote attackers to issue Denial of Service attacks or unathorized privileged access.


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**REVISED 01**
Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0304-253
Originally issued: 03 April 2003
Last revised: 04 April 2003
SSRT3531 Potential Security Vulnerability in sendmail (rev.1)
-----------------------------------------------------------------

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.

**REVISED 01**
AVAILABILITY: Fixes are available for 10.20, 11.00, 11.04(VVOS),
--> 11.11, and 11.22. This bulletin will be revised
--> when a fix is available for 10.10.

CHANGE SUMMARY: Rev.01 - Added fix for 11.22.
Added HPSecurityBul253.depot.

-----------------------------------------------------------------
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.
**REVISED 01**
--> 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

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:[email protected]/
or: ftp://sendmail:[email protected]/
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



==================================================
To fix the problem:

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.
**REVISED 01**
--> 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 10.20: 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 10.20

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/mail/sendmail.cf file delivered with
the new 8.11.1.
For 8.9.3 the change must be made in the
/usr/newconfig/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
--> 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 10.20: 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
**REVISED 01**
--> 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.

cksum:
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.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

**REVISED 01**

--> If you are runnimg 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:

http://itrc.hp.com

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)

Fingerprint =
6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

If you have problems locating the key please write to
[email protected] Please note that this key is
for signing bulletins only and is not the key returned
by sending 'get key' to [email protected]


D. To report new security vulnerabilities, send email to

[email protected]

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 [email protected]

-----------------------------------------------------------------

(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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