Published:
15 June 1997
Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-97.073 -- REVISED 01 Hewlett-Packard Security Bulletin #00023
Security Vulnerability in at and cron for HP-UX 8.X & 9.X
16 June 1997
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Hewlett-Packard has released the following advisory concerning a
vulnerability in the 'at' and 'cron' programs. This vulnerability may
allow local users to gain unauthorized privileges.
The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no
control over its content. As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
Contact information for Hewlett-Packard is included in the Security
Bulletin below. If you have any questions or need further information,
please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/information/advisories.html
If you believe that your system has been compromised, contact AUSCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 4477
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AUSCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
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Document ID: HPSBUX9502-023
Date Loaded: 970613
Title: Security vulnerability in `at' & `cron'
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**REVISED 01**HEWLETT-PACKARD SECURITY BULLETIN: #00023, 22 Feb 95
LAST CHANGE 12 June 1997
- -------------------------------------------------------------------------
The information in the following Security Bulletin should be acted upon as
soon as possible. Hewlett- Packard 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: Security vulnerability in `at' and `cron' commands in HP-UX
PLATFORM: HP 9000 series 300/400s and/or 700/800s
DAMAGE: Users can gain unauthorized privileges
SOLUTION: Apply patch:
PHCO_5203 (series 700 , HP-UX 8.X), or
PHCO_5204 (series 800 , HP-UX 8.X), or
PHCO_5199 (series 300/400, HP-UX 8.X), or
PHCO_5178 (series 700 , HP-UX 9.X), or
PHCO_5193 (series 800 , HP-UX 9.X), or
PHCO_5206 (series 300/400, HP-UX 9.0), or
PHCO_5206 (series 300/400, HP-UX 9.03),
**REVISED01** | PHCO_5442 and PHCO_5414 (series 800, HP-UX 9.08), or
| PHCO_5416 and PHCO_5295 (series 700, HP-UX 9.09), or
| PHCO_5415 and PHCO_5295 (series 700, HP-UX 9.09+).
AVAILABILITY: All patches are available now.
CHANGE SUMMARY: New patches for CMW/BLS releases are included.
_______________________________________________________________________
I. Update
A. It has been found that all HP-UX systems have this vulnerability.
B. Fixing the problem
The vulnerability can be eliminated from releases 8.X and 9.X of
HP-UX by applying a patch.
All customers concerned with the security of their HP-UX systems
should apply the appropriate patch described above as soon as
possible.
C. How to Install the Patch (for HP-UX 8.X and 9.X)
1. Determine which patch is appropriate for your hardware platform and
operating system:
PHCO_5203 (series 700 , HP-UX 8.X), or
PHCO_5204 (series 800 , HP-UX 8.X), or
PHCO_5199 (series 300/400, HP-UX 8.X), or
PHCO_5178 (series 700 , HP-UX 9.X), or
PHCO_5193 (series 800 , HP-UX 9.X), or
PHCO_5206 (series 300/400, HP-UX 9.0), or
PHCO_5206 (series 300/400, HP-UX 9.03),or
**REVISED01** | PHCO_5442 and PHCO_5414 (series 800, HP-UX 9.08), or
| PHCO_5416 and PHCO_5295 (series 700, HP-UX 9.09), or
| PHCO_5415 and PHCO_5295 (series 700, HP-UX 9.09+).
2. Apply the patch to your HP-UX system.
Examine /tmp/update.log for any relevant WARNINGs or ERRORs. This
can be done as follows:
a. At the shell prompt, type "tail -60 /tmp/update.log | more"
b. Page through the next three screens via the space bar, looking
for WARNING or ERROR messages.
3. Impact of the patch and workaround
The patch for HP-UX releases 8.X and 9.X provides a new version of
/etc/cron and /usr/bin/at which fixes the vulnerability.
E. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP Electronic Support Center via electronic
mail, do the following:
User your browser to get to the HP Electronic Support Center page
at: http://us-support.external.hp.com
(for US, Canada, Asia-Pacific, & Latin-America)
http://europe-support.external.hp.com
(for Europe)
Click on the Technical Knowledge Database, register as a user
(remember to save the User ID assigned to you, and your password),
and it will connect to a HP Search Technical Knowledge DB page.
Near the bottom is a hyperlink to our Security Bulletin archive.
Once in the archive there is another link to our current
security patch matrix. Updated daily, this matrix is categorized
by platform/OS release, and by bulletin topic.
F. 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.
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.
________________________________________________________________________
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