SSRT3531 Potential Security Vulnerability in sendmail (rev.7)

SSRT3531 Potential Security Vulnerability in sendmail (rev.7)

Post by Security Ale » Thu, 24 Jul 2003 22:15:02



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**REVISED 07**
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0304-253
 Originally issued: 03 April 2003
 Last revised: 21 July 2003
 SSRT3531 Potential Security Vulnerability in sendmail (rev.7)
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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,
        Potential Denial of Service (DoS).

PLATFORM: HP 9000 Series 700/800 Servers running HP-UX B.10.10,
          B.10.20, B.11.00, B.11.04(VVOS), B.11.11, and B.11.22.

**REVISED 07**
SOLUTION: B.10.10 - Download and install the appropriate files
 -->      B.10.20 - install PHNE_28760
 -->      B.11.00 (sendmail-8.9.3) - install PHNE_28809
 -->      B.11.04 - Download and install the appropriate files
 -->      B.11.11 (sendmail-8.9.3) - install PHNE_28810
 -->      B.11.22 - install PHNE_28409

          The sendmail files also address the
          issues documented in HPSBUX0302-246.

          If the sendmail files from HPSBUX0304-253
          are installed, it is not necessary to install
          the sendmail files from HPSBUX0302-246.

          If both sets of sendmail files are installed,
          the sendmail files from HPSBUX0304-253 must be
          installed *AFTER* the sendmail files from
          HPSBUX0302-246 in order to ensure all issues are
          addressed.

MANUAL ACTIONS: Yes - NonUpdate
 -->            B.10.10 and B.11.04:
                Download and install the appropriate files.
 -->            All versions:
 -->            Modify /etc/mail/sendmail.cf

AVAILABILITY: Fixes are available for B.10.10, B.10.20, B.11.00,
              B.11.04(VVOS), B.11.11, and B.11.22.

CHANGE SUMMARY: Rev.01 - Added fix for B.11.22.
                         Added HPSecurityBul253.depot.
                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 B.11.00
                         and B.11.11.
                Rev.05 - Added pre-release sendmail-8.11.1 web
                         upgrades for B.11.00 and B.11.11.
                Rev.06 - Added pre-release sendmail-8.11.1 patch
                         for B.11.22.
                         Added pre-release sendmail-8.9.3 patch
                         for B.10.20.
                         PHNE_26304 and PHNE_28761 for sendmail
                         8.9.3 contain the wrong man pages.
                         Changed to uniform revision notation
                         (e.g. 11.00 -> B.11.00) to match the
                         "uname -a" output.
                Rev.07 - Added PHNE_28760
                         for  B.10.20 sendmail-8.9.3.
                         Added PHNE_28809
                         for B.11.00 sendmail-8.9.3.
                         Added web upgrades for
                         sendmail-8.11.1 B.11.00 and B.11.11.
                         Added PHNE_28409 for B.11.22
                         Added PHNE_28810 for B.11.11.
                         Added AFFECTED VERSIONS section.

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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 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: 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.

 --> 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: PHNE_28409
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> HP-UX B.11.11
 --> =============
 --> SMAIL-811.INETSVCS-SMAIL
 --> fix: web upgrade
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> InternetSrvcs.INETSVCS-RUN
 --> fix: PHNE_28810
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> HP-UX B.11.04
 --> =============
 --> InternetSrvcs.INETSVCS-RUN
 --> fix: Install sendmail.893.11.00.r1 and
 -->      killsm.893.11.00.
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> HP-UX B.11.00
 --> =============
 --> SMAIL-811.INETSVCS-SMAIL
 --> fix: web upgrade
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> InternetSrvcs.INETSVCS-RUN
 --> fix: PHNE_28809
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> HP-UX B.10.20
 --> =============
 --> InternetSrvcs.INETSVCS-RUN
 --> fix: PHNE_28760
 -->      Modify /etc/mail/sendmail.cf
 -->
 --> HP-UX B.10.10
 --> =============
 --> InternetSrvcs.INETSVCS-RUN
 --> fix: Upgrade to 8.8.6 then install the
 -->      sendmail.886.10.10.r1 file.
 -->      Modify /etc/mail/sendmail.cf

 B. Recommended solution

**REVISED 07**
 -->Modify /etc/mail/sendmail.cf as follows:

 -->   Add "restrictqrun" to the PrivacyOptions.
 -->   After the change the line should read:

 -->     O PrivacyOptions=authwarnings,restrictqrun

 -->Then install the patch, upgrade, or files.

 -->Determine the sendmail version:

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

 -->    The display will show Version #.#.#

 -->Install the fix for that version as described below.

    HP-UX B.11.22 sendmail 8.11.1
 -->    PHNE_28409 is now available.

    HP-UX B.11.00 and B.11.11 sendmail 8.11.1
 -->    A web upgrade is available from software.hp.com.

    HP-UX B.11.11 sendmail 8.9.3
 -->    PHNE_28810 is now available.

 -> HP-UX B.11.00 sendmail 8.9.3
 ->     PHNE_28809 is now available.

 -> HP-UX B.10.20 sendmail 8.9.3
 ->     PHNE_28760 is now available.

 -> For B.10.10 and B.11.04 individual files
 -> are available from a temporary ftp site.
 -> Details are below.

    Note: The fixes mentioned here include the fix for
          for HPSBUX0302-246.

    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:sendm...@hprc.external.hp.com/
                or: ftp://sendmail:sendm...@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 for B.10.10 and B.11.04

    1. Determine the sendmail version.
    2. If necessary upgrade to a version of sendmail
       for which a fix is available.
    3. 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 B.10.10: sendmail 8.8.6
           VVOS  B.11.04: sendmail 8.9.3

        If you are not running one the those versions,
        you will need to upgrade as follows:

        HP-UX B.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.

        VVOS B.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.

    3. Download and install the appropriate file(s).

        a. Download the appropriate file(s).

       For HP-UX B.10.10: sendmail.886.10.10.r1.gz for 8.8.6
       For HP-UX B.11.04: sendmail.893.11.00.r1.gz for 8.9.3
                        killsm.893.11.00 for 8.9.3

       b. Unpack the file with gunzip(1)

       c. Verify the cksum or the md5 sum.

      2985469994 401408 sendmail.886.10.10.r1
      2688504642 1052 killsm.893.11.00
      342459522 831488 sendmail.893.11.00.r1

     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.893.11.00.r1) = ae011668557a64d93d5b683380332b8d
    MD5 (killsm.893.11.00) = 4eb6f978de78540790487931b8f43eb1

       d. Install the appropriate file(s) 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.893.11.00 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 B.11.04:

          cp sendmail.893.11.00.r1 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 B.11.04
             The command runs sendmail as a daemon, which is
             not supported by VVOS (Virtual Vault Operating
             System).

     End of Step 3.
    ==================================================

    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)
       <security-al...@hp.com>
       Fingerprint =
         6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

    If you have problems locating the key please write to
    security-al...@hp.com.  Please note that this key is
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    by sending 'get key' to security-al...@hp.com.

 D. To report new security vulnerabilities, send email to

    security-al...@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-al...@hp.com.

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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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