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Category:   OS (UNIX)  >   Bastille Vendors:   HPE
HP-UX Bastille Configuration Error Lets Remote Users Query Sendmail With EXPN and VRFY Commands to Obtain Information About Operating System Users
SecurityTracker Alert ID:  1006126
SecurityTracker URL:  http://securitytracker.com/id/1006126
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Feb 18 2003
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): Bastille B.02.00.00; HP-UX 11.00 and HP-UX 11.11
Description:   A vulnerability was reported in the HP-UX Bastille security hardening software. Sendmail privacy options may be incorrectly configured.

A remote user may be able to query the sendmail daemon to verify the existence of operating system users and to expand sendmail aliases. This is due to the improper configuration of the novrfy and noexpn options in sendmail.cf.

HP reports that Bastille Linux is not affected.

Impact:   A remote user can obtain information about operating system users via the EXPN and VRFY SMTP commands.
Solution:   HP has released a fixed version (B.02.00.05), available at:

http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/displayProductInfo.pl?productNumber=B6849AA

HP has also released patch PHSS_28558 for systems with HP-UX Bastille B.02.00.00 installed.

Vendor URL:  www.hp.com/ (Links to External Site)
Cause:   Configuration error

Message History:   None.


 Source Message Contents

Subject:  HP-UX security bulletins digest



Document ID:  HPSBUX0302-245
Date Loaded:  20030217
      Title:  SSRT3450 HP-UX Bastille sendmail.cf problem

-----------------------------------------------------------------
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0203-245
 Originally issued: 13 February 2003
 SSRT3450 HP-UX Bastille sendmail.cf problem
 -----------------------------------------------------------------

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: HP has discovered a functional defect in Bastille
         B.02.00.00 which caused the sendmail privacy options not
         to be configured correctly if that option were chosen.

IMPACT: Not applying the recommended patch may result in
        unintended availability of usernames and aliases if the
        sendmail daemon is still running.  This is the same as the
        behavior if you did not choose to restrict the vrfy and
        expn commands with Bastille.

PLATFORM:  HP-UX 11.00 and HP-UX 11.11

SOLUTION: Install HP-UX Bastille B.02.00.05 or later or
          install PHSS_28558 on systems with HP-UX Bastille
          B.02.00.00 installed.  Either solution completely
          addresses this problem.

MANUAL ACTIONS: No.

AVAILABILITY: Both the patch and Bastille B.02.00.05 are available
              now.

 ------------------------------------------------------------------
 A. Background

    Bastille is a security hardening/lockdown tool which can be
    used to enhance the security of the HP-UX operating system. It
    provides customized lockdown on a system by system basis by
    encoding functionality similar to the Bastion Host whitepaper
    and other hardening/lockdown checklists.

    Bastille was originally developed by the open source community
    for use on Linux systems. HP is contributing by providing
    Bastille on HP-UX and helping to improve Bastille on both
    platforms.

    The functional defect in Bastille B.02.00.00 which caused
    sendmail to be improperly configured does not affect
    Bastille Linux.  If a sendmail daemon is running, the improper
    configuration may allow network users to verify the existence
    system users as well as expanding sendmail aliases if any are
    defined.

    Specifically, HP-UX Bastille B.02.00.00 incorrectly configured
    the novrfy and noexpn options in sendmail.cf.  PHSS_28558 will
    fix the problem.

    PHSS_28558 has two effects.  First, Bastille is modified to
    handle the novrfy and noexpn options correctly.  Second, if the
    novrfy and noexpn options in sendmail.cf had been configured
    incorrectly PHSS_28558 will modify sendmail.cf and cause sendmail
    to read the corrected configuration.

 B. Recommended solution

    If B.02.00.00 has been installed either download and install
    HP-UX Bastille B.02.00.05 (or later) or apply PHSS_28558.

    Bastille B.02.00.05
    ===================
    Download and install HP-UX Bastille B.02.00.05 or later from
    http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
    displayProductInfo.pl?productNumber=B6849AA

        ("Receive for free" link at the bottom of the page)

    Bastille B.02.00.00 and PHSS_28558
    ==================================
    If you have already used Bastille 2.0.0 to configure your
    system, only applying PHSS_28558 is necessary.  Applying this
    patch will fix the sendmail configuration (if applicable to
    your system) and the defect in Bastille for future runs.

 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".

 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.

 ________________________________________________________________
-----End of Document ID:  HPSBUX0302-245--------------------------------------

 
 


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