Published:
08 January 1997
Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-97.006 -- Hewlett Packard Advisory on chsh and chfn
9 January 1997
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Hewlett-Packard has released the following Security Bulletin Digest
containing documents addressing a number of security vulnerabilities
under HP-UX. These vulnerabilities may allow local users to gain root
privileges.
The bulletin concerning the chfn executable (HPSBUX9701-049) addresses
the vulnerability earlier reported in AUSCERT advisory AA-96.18.
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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Digest Name: security_info
Description: Daily Security Bulletins Digest
Created: Thu Jan 09 03:00:01 1997 PST
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Summary of 'Daily Security Bulletins Digest' documents
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Document Id Description Page 1
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HPSBUX9701-050 Security Vulnerability in chsh executable
HPSBUX9701-049 Security Vulnerability in chfn executable
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Detailed list of 'Daily Security Bulletins Digest' documents
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Document Id: [HPSBUX9701-050]
Date Loaded: [01-09-97]
Description: Security Vulnerability in chsh executable
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HEWLETT-PACKARD SECURITY BULLETIN: #00050, 09 January 1997
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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.
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PROBLEM: Security vulnerability in the chsh 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_9600 for all platforms with HP-UX releases 9.X
PHCO_9601 for all platforms with HP-UX releases 10.00/10.01/10.10
PHCO_9602 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 chsh command (/usr/bin/chsh) 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.
NOTE: The patch fixes /usr/bin/chsh. Once installed, it is
necessary to also replace the file /bin/chsh file, which
placed there for backwards compatible.
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 support@us.external.hp.com (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.
NOTE: The patch fixes /usr/bin/chsh. Once installed, it is
necessary to also replace the file /bin/chsh file, which
placed there for backwards compatible.
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 chsh 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
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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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.
- -------------------------------------------------------------------------
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 support@us.external.hp.com (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
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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