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Category:   OS (UNIX)  >   Crontab Vendors:   HPE
HP/UX's Crontab Utility May Allow Local Users to Crash The System
SecurityTracker Alert ID:  1001113
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 19 2001
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): HP9000 Series 700 and 800 running HP-UX releases 11.00, 11.04, 10.20, 10.24, 10.10, and 10.01.
Description:   HP announced a vulnerability (Bulletin HPSBUX0103-146) in HP/UX's crontab that allows local users to potentially crash the server.

The vulnerability is due to a buffer overflow in crontab(1).

HP recommends that customers apply the appropriate HP patches.

Impact:   Local users could potentially crash the server.
Solution:   The vendor recommends applying the appropriate patches: 11.00: PHCO_22767,
11.04: PHCO_23429,
10.20: PHCO_22768,
10.24: PHCO_23455,
10.10: PHCO_22769,
10.01: PHCO_22770.

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (HP/UX)

Message History:   None.

 Source Message Contents

Subject:  security bulletins digest

                        HP Support Information Digests

o  IT Resource Center World Wide Web Service

   If you subscribed through the IT Resource Center and would
   like to be REMOVED from this mailing list, access the
   IT Resource Center on the World Wide Web at:

   Login using your IT Resource Center User ID and Password.
   Then select Support Information Digests (located under
   Maintenance and Support).  You may then unsubscribe from the
   appropriate digest.

Digest Name:  daily security bulletins digest
    Created:  Mon Mar 19  3:00:03 PST 2001

Table of Contents:

Document ID      Title
---------------  -----------
HPSBUX0103-146   Sec. Vulnerability in crontab(1)

The documents are listed below.

Document ID:  HPSBUX0103-146
Date Loaded:  20010318
      Title:  Sec. Vulnerability in crontab(1)

    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.
ISSUE:  crontab(1) contains a buffer overflow.

PLATFORM:  HP9000 Series 700 and 800 running HP-UX releases 11.00,
           11.04, 10.20, 10.24, 10.10, and 10.01.

POSSIBLE RESULT: Users could compromise system availability.

SOLUTION: Apply patches for HP-UX releases as follows:
                 for 11.00:           PHCO_22767,
                     11.04:           PHCO_23429,
                     10.20:           PHCO_22768,
                     10.24:           PHCO_23455,
                     10.10:           PHCO_22769,
                     10.01:           PHCO_22770.

AVAILABILITY: The patches are available now.
    A. Background
       Hewlett-Packard Company has become aware of a defect in the
       crontab(1) in various releases of the HP-UX OS.

    B. Fixing the problem The problem can be fully resolved by
       applying the appropriate patches to the system.
       For HP-UX releases
                     11.00:           PHCO_22767,
                     11.04:           PHCO_23429,
                     10.20:           PHCO_22768,
                     10.24:           PHCO_23455,
                     10.10:           PHCO_22769,
                     10.01:           PHCO_22770.

       NOTE: The VVOS 10.24 patch has dependencies.

       While a reboot is not required, shutting down cron (by executing
       as root /sbin/init.d/cron stop) will assure that new instances
       are running the correct, now patched, binary.

       Both of the VVOS patches (10.24 and 11.04) cannot automatically
       start cron(1M) during its installation.  Therefore, to get the
       functionality of the new cron(1M) one of the following *MUST*

         - the system must be rebooted during or after the
           installation of the patch, or

         - cron must be stopped and started manually using
           the commands:

               /sbin/init.d/cron stop
               /sbin/init.d/cron start

    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

       Under the Maintenance and Support Menu (Electronic Support
       Center):  click on the "more..." link.  Then -

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       using your ID and password.  Check with your system
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       your password.

       Under the Maintenance and Support Menu, click on the "more..."
       link.  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.


       To -review- bulletins already released, select the link
       (in the middle column) for the appropriate digest.

       To -gain access- to the Security Patch Matrix, select
       the link for "hp security bulletins archive" near the bottom.
       Once in the archive the top link is to our current Security
       Patch Matrix.  Updated daily, this matrix categorizes security
       patches by platform/OS release, and by bulletin topic.

       The security patch matrix is also available via anonymous ftp:

       On the "Support Information Digest Main" page:
       click on the "HP Security Bulletin Archive".

    D. To report new security vulnerabilities, send email to

       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

       Permission is granted for copying and circulating this Bulletin
       to Hewlett-Packard (HP) customers (or the Internet community)
       for the purpose of alerting them to problems, if and only if,
       the Bulletin is not edited or changed in any way, is attributed
       to HP, and provided such reproduction and/or distribution is
       performed for non-commercial purposes.

       Any other use of this information is prohibited. HP is not
       liable for any misuse of this information by any third party.
-----End of Document ID:  HPSBUX0103-146--------------------------------------


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