SSRT3631 Potential Security Vulnerability in sendmail (rev.1)

From: Security Alert (secure_at_cup.hp.com)
Date: 09/30/03 

Date: 30 Sep 2003 13:36:40 -0600

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**REVISED 01**
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0309-281
 Originally issued: 21 September 2003
 Last revised: 29 September 2003
 SSRT3631 Potential Security Vulnerability in sendmail
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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.

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PROBLEM: Potential security vulnerability in sendmail

IMPACT: Potential unauthorized Privileged Access.

PLATFORM: HP-UX releases B.11.00, B.11.04 (VVOS), B.11.11, B.11.22

SOLUTION: Download and install the appropriate sendmail file.

MANUAL ACTIONS: Yes - NonUpdate
                Download and install the appropriate
                sendmail file.

AVAILABILITY: The files are available from the ftp site described
              below.

CHANGE SUMMARY: Rev.01 - Added fix for CAN-2003-0681.
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 A. Background
    A potential security vulnerability with sendmail has been
    reported in HP-UX. This potential vulnerability may result
    in unauthorized Privileged Access.

    This is the vulnerability reported in CERT/CC CA-2003-2:

     <http://www.cert.org/advisories/CA-2003-25.html>

**REVISED 01**

 -->New versions are available which also contain the fix for
 -->the problem reported here:

 --><http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0681>

     AFFECTED VERSIONS

     The following is a list by HP-UX revision of
     affected filesets and the fileset revision or
     patch containing the fix. To determine if a
     system has an affected version, search the
     output of "swlist -a revision -l fileset"
     for an affected fileset, then determine if
     a fixed revision or the applicable patch is
     installed.

     HP-UX B.11.22
     =============
     InternetSrvcs.INETSVCS2-RUN
     InternetSrvcs.INETSVCS-RUN
 --> fix: install sendmail.11.22.r4 file

     HP-UX B.11.11
     =============
     SMAIL-811.INETSVCS-SMAIL
 --> fix: install sendmail.811.11.11.r4 file

     InternetSrvcs.INETSVCS-RUN
 --> fix: install sendmail.893.11.11.r4 file

     HP-UX B.11.04
     =============
     InternetSrvcs.INETSVCS-RUN
 --> fix: install sendmail.893.11.00.r4 file

     HP-UX B.11.00
     =============
     SMAIL-811.INETSVCS-SMAIL
 --> fix: install sendmail.811.11.00.r4 file

     InternetSrvcs.INETSVCS-RUN
 --> fix: install sendmail.893.11.00.r4 file

     END AFFECTED VERSIONS

 B. Recommended solution

        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

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

    1. Install the patches recommended in HPSBUX0304-253.
    2. Determine the sendmail version.
    3. Download and install the appropriate sendmail file.

    Details:

    1. HPSBUX0304-253 must be implemented before proceeding.

    2. Determine the sendmail version.

        Login in as root:
          cd /usr/sbin
          sendmail -d0.1 < /dev/null | grep -i version

        The display will show Version #.#.#

    3. Download and install the appropriate file.

        a. Download the appropriate file(s).

**REVISED 01**
 --> For HP-UX 11.00: sendmail.811.11.00.r4.gz for 8.11.1
 --> sendmail.893.11.00.r4.gz for 8.9.3
 --> For HP-UX 11.04: sendmail.893.11.00.r4.gz for 8.9.3
 --> For HP-UX 11.11: sendmail.811.11.11.r4.gz for 8.11.1
 --> sendmail.893.11.11.r4.gz for 8.9.3
 --> For HP-UX 11.22: sendmail.811.11.22.r4.gz fot 8.11.1

       b. Unpack the file with gunzip(1)

       c. Verify the cksum or the md5 sum.

     cksum:
 --> 496737019 831488 sendmail.893.11.00.r4
 --> 772697028 974848 sendmail.811.11.00.r4
 --> 2187106120 864256 sendmail_893.11.11.r4
 --> 3209418086 1019904 sendmail.811.11.11.r4
 --> 1462405939 2312500 sendmail.811.11.22.r4

 --> MD5 (sendmail.893.11.00.r4) =
 --> cb5dd8680d77ecd8b26050582de0f45d
 --> MD5 (sendmail.811.11.00.r4) =
 --> 01d738201b0735f77b1c9888e99a2df1
 --> MD5 (sendmail_893.11.11.r4) =
 --> 4f2f0530f8a2b0316d02de75d6e569d1
 --> MD5 (sendmail.811.11.11.r4) =
 --> 35570fcd2c60e2a208ac633840ac9fc2
 --> MD5 (sendmail.811.11.22.r4) =
 --> c214dd0eb95f03ef7c9a77675d252f93

     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

       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

       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.r4 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).
    ==================================================

    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
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    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".

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(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
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