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Category:   Application (E-mail Server)  >   Sendmail Vendors:   Sendmail Consortium
(HP Issues Fix for HP/UX) Sendmail Prescan Flaw May Let Remote Users Execute Arbitrary Code With Root Privileges
SecurityTracker Alert ID:  1007785
SecurityTracker URL:  http://securitytracker.com/id/1007785
CVE Reference:   CVE-2003-0694   (Links to External Site)
Date:  Sep 23 2003
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, Root access via local system, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.12.9 and prior versions
Description:   A vulnerability was reported in Sendmail. A local or remote user may be able to execute arbitrary code on the target system.

It is reported that the prescan() function in 'parseaddr.c' contains a flaw [that is different than previously reported prescan flaw]. The report states that various exploit methods are possible, but these exploit methods were not disclosed.

The report indicates that it is confirmed that a local user can exploit this flaw and it is believed that a remote user may also exploit this flaw.

Impact:   A local or remote user may be able to execute arbitrary code with the privileges of the sendmail process.
Solution:   HP has released a fix for HP/UX:

For HP-UX B.11.22:

InternetSrvcs.INETSVCS2-RUN
InternetSrvcs.INETSVCS-RUN
fix: install sendmail.11.22.r3 file

For HP-UX B.11.11:

SMAIL-811.INETSVCS-SMAIL
fix: install sendmail.811.11.11.r3 file

InternetSrvcs.INETSVCS-RUN
fix: install sendmail.893.11.11.r3 file

For HP-UX B.11.04:

InternetSrvcs.INETSVCS-RUN
fix: install sendmail.893.11.00.r3 file

For HP-UX B.11.00:

SMAIL-811.INETSVCS-SMAIL
fix: install sendmail.811.11.00.r3 file

InternetSrvcs.INETSVCS-RUN
fix: install sendmail.893.11.00.r3 file

Instructions for downloading and installing the patch are provided in the Source Message.

Vendor URL:  www.sendmail.org/8.12.10.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (HP/UX)
Underlying OS Comments:  11.00, 11.04 (VVOS), 11.11, and 11.22

Message History:   This archive entry is a follow-up to the message listed below.
Sep 17 2003 Sendmail Prescan Flaw May Let Remote Users Execute Arbitrary Code With Root Privileges



 Source Message Contents

Subject:  HP-UX security bulletins digest



Document ID:  HPSBUX0309-281
Date Loaded:  20030921
      Title:  SSRT3631 Potential Security Vulnerability in sendmail

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

 -----------------------------------------------------------------
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0309-281
 Originally issued: 21 September 2003
 SSRT3631 Potential Security Vulnerability in sendmail
 -----------------------------------------------------------------

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.

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.

 -----------------------------------------------------------------
 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>

     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.r3 file

     HP-UX B.11.11
     =============
     SMAIL-811.INETSVCS-SMAIL
     fix: install sendmail.811.11.11.r3 file

     InternetSrvcs.INETSVCS-RUN
     fix: install sendmail.893.11.11.r3 file

     HP-UX B.11.04
     =============
     InternetSrvcs.INETSVCS-RUN
     fix: install sendmail.893.11.00.r3 file

     HP-UX B.11.00
     =============
     SMAIL-811.INETSVCS-SMAIL
     fix: install sendmail.811.11.00.r3 file

     InternetSrvcs.INETSVCS-RUN
     fix: install sendmail.893.11.00.r3 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).

       For HP-UX 11.00: sendmail.811.11.00.r3.gz for 8.11.1
                        sendmail.893.11.00.r3.gz for 8.9.3
       For HP-UX 11.04: sendmail.893.11.00.r3.gz for 8.9.3
       For HP-UX 11.11: sendmail.811.11.11.r3.gz for 8.11.1
                        sendmail.893.11.11.r3.gz for 8.9.3
       For HP-UX 11.22: sendmail.11.22.r3.gz

       b. Unpack the file with gunzip(1)

       c. Verify the cksum or the md5 sum.

     cksum:
        366142532 2312468   sendmail.11.22.r3
        3113317626 1015808  sendmail_811.11.11.r3
        633770996 864256    sendmail_893.11.11.r3
        2600314720 970752   sendmail_811.11.00.r3
        1784851381 831488   sendmail_893.11.00.r3

  MD5 (sendmail.11.22.r3) = 8a15820a4ffef2273b69b1075f7bd108
  MD5 (sendmail_811.11.11.r3) = 063afcf96082f8695f3ce1bcf274f07f
  MD5 (sendmail_893.11.11.r3) = 79bfd640b9af0c6a444f9080557fe4ad
  MD5 (sendmail_811.11.00.r3) = 01efa5d5c57209f92cbcc04b6cc6ccff
  MD5 (sendmail_893.11.00.r3) = 7047205b94ea6c3916b00615a6cdd382


     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.r3 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
    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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-----End of Document ID:  HPSBUX0309-281--------------------------------------

 
 


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