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CERT* Vendor-Initiated Bulletin VB-97.04
July 9, 1997
Topic: Security Vulnerability in chfn executable
Source: Hewlett-Packard Company
To aid in the wide distribution of essential security information, the CERT
Coordination Center is forwarding the following information from
Hewlett-Packard Company. Hewlett-Packard contact information is included in
the forwarded text below; please contact them if you have any questions or
need further information.
Note: Hewlett-Packard reminds customers to use the HP Supportline
to check the patch matrix for current patch IDs. Because patches are
cumulative, IDs change daily. The patch matrix is updated
automatically every 24 hours.
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Document Id: [HPSBUX9701-049]
Date Loaded: [01-09-97]
Description: Security Vulnerability in chfn executable
===============================================================================
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HEWLETT-PACKARD SECURITY BULLETIN: #00049, 09 January 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 the chfn executable
PLATFORM: HP 9000 Series 700/800s running versions of HP-UX 9.X & 10.X
DAMAGE: Vulnerabilities exists allowing local users to gain root
privileges.
SOLUTION: Apply patch:
PHCO_9595 for all platforms with HP-UX releases 9.X
PHCO_9596 for all platforms with HP-UX releases 10.00/10.01/10.10
PHCO_9597 for all platforms with HP-UX releases 10.20
AVAILABILITY: All patches are available now.
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I.
A. Background
A vulnerability with the chfn command (/usr/bin/chfn) has been
discovered.
B. Fixing the problem
The vulnerability can be eliminated from HP-UX releases 9.X and
10.X by applying the appropriate patch.
C. Recommended solution
1. Determine which patch are appropriate for your operating
system.
2. Hewlett-Packard's HP-UX patches are available via email
and the World Wide Web
To obtain a copy of the Hewlett-Packard SupportLine email
service user's guide, send the following in the TEXT PORTION
OF THE MESSAGE to This email address is being protected from spambots. You need JavaScript enabled to view it. (no Subject
is required):
send guide
The users guide explains the HP-UX patch downloading process
via email and other services available.
World Wide Web service for downloading of patches
is available via our URL:
(http://us.external.hp.com)
3. Apply the patch to your HP-UX system.
4. Examine /tmp/update.log (9.X), or /var/adm/sw/swinstall.log
(10.X), for any relevant WARNING's or ERROR's.
D. Impact of the patch
The patches for HP-UX releases 9.X and 10.X provide enhancements
to the chfn executable to avoid this vulnerability.
E. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP SupportLine Digest service via electronic
mail, do the following:
1) From your Web browser, access the URL:
http://us-support.external.hp.com (US,Canada,
Asia-Pacific, and Latin-America)
http://europe-support.external.hp.com (Europe)
2) On the HP Electronic Support Center main screen, select
the hyperlink "Support Information Digests".
3) On the "Welcome to HP's Support Information Digests" screen,
under the heading "Register Now", select the appropriate hyperlink
"Americas and Asia-Pacific", or "Europe".
4) On the "New User Registration" screen, fill in the fields for
the User Information and Password and then select the button labeled
"Submit New User".
5) On the "User ID Assigned" screen, select the hyperlink
"Support Information Digests".
** Note what your assigned user ID and password are for future
reference.
6) You should now be on the "HP Support Information Digests Main"
screen. You might want to verify that your email address is correct
as displayed on the screen. From this screen, you may also
view/subscribe to the digests, including the security bulletins
digest.
To get a patch matrix of current HP-UX and BLS security
patches referenced by either Security Bulletin or Platform/OS,
click on following screens in order:
Technical Knowledge Database
Browse Security Bulletins
Security Bulletins Archive
HP-UX Security Patch Matrix
F. To report new security vulnerabilities, send email to
This email address is being protected from spambots. You need JavaScript enabled to view it.
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
This email address is being protected from spambots. You need JavaScript enabled to view it. .
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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If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident Response
and Security Teams (FIRST). See http://www.first.org/team-info/.
We strongly urge you to encrypt any sensitive information you send by email.
The CERT Coordination Center can support a shared DES key and PGP. Contact
the CERT staff for more information.
Location of CERT PGP key
ftp://info.cert.org/pub/CERT_PGP.key
CERT Contact Information
- ------------------------
Email This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone +1 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30-5:00 p.m. EST
(GMT-5)/EDT(GMT-4), and are on call for
emergencies during other hours.
Fax +1 412-268-6989
Postal address
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
USA
CERT publications, information about FIRST representatives, and other
security-related information are available from
http://www.cert.org/
ftp://info.cert.org/pub/
CERT advisories and bulletins are also posted on the USENET newsgroup
comp.security.announce
To be added to our mailing list for CERT advisories and bulletins, send your
email address to
This email address is being protected from spambots. You need JavaScript enabled to view it.
In the subject line, type
SUBSCRIBE your-email-address
* Registered U.S. Patent and Trademark Office.
The CERT Coordination Center is part of the Software Engineering
Institute (SEI). The SEI is sponsored by the U. S. Department of Defense.
This file: ftp://info.cert.org/pub/cert_bulletins/VB-97.04.hp
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