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Home » Hacking News » Hewlett Packard HPSBUX0308-275: Shells improperly manage files during operations

Hewlett Packard HPSBUX0308-275: Shells improperly manage files during operations

by Nikola Strahija on August 26th, 2003 Many system modules create insecure temporary files with a name based on a process id, and write subsequent input to that file. Improper error checking of various sytem calls results in a vulnerability.


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Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0308-275
Originally issued: 26 August 2003
SSRT3618 Security Vulnerability in HP-UX shells
-----------------------------------------------------------------

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.

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PROBLEM: Shells improperly manage files during operations.

IMPACT: Possible increase of privilege, filesystem damage,
denial of service.

PLATFORM: HP9000 servers running HP-UX versions B.10.20, B.11.00,
B.11.11.

SOLUTION: Apply the appropriate patch from itrc.hp.com:

PHCO_27345 B.11.11 sh-posix
PHCO_27019 B.11.11 ksh
PHCO_26561 B.11.11 csh

PHCO_27344 B.11.00 sh-posix
PHCO_27418 B.11.00 ksh
PHCO_27763 B.11.00 csh

PHCO_27804 B.10.20 sh-posix
PHCO_27803 B.10.20 ksh
PHCO_27819 B.10.20 csh

MANUAL ACTIONS: No

AVAILABILITY: All patches are available now on itrc.hp.com
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A. Background
Many system modules create insecure temporary files with a
name based on a process id, and write subsequent input
to that file. Improper error checking of various sytem
calls results in a vulnerability.

Reference:
CERT-VN:VU#10277 URL:http://www.kb.cert.org/vuls/id/10277
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2000-1134

This problem also affects HP Tru64 UNIX
See SSRT1-41U, SSRT0742U, SSRT0759U

NOTE: This problem does not impact HP NonStop Servers

AFFECTED VERSIONS
The following is a list by HP-UX revision of
affected filesets and the fileset revision or
patch containing the fix. To determine if a
system has an affected version, search the
output of "swlist -a revision -l fileset"
for an affected fileset, then determine if
a fixed revision or the applicable patch is
installed.

HP-UX B.11.11
=============
OS-Core.UX-CORE
fix: install patches
PHCO_27345 B.11.11 sh-posix
PHCO_27019 B.11.11 ksh
PHCO_26561 B.11.11 csh

HP-UX B.11.00
=============
OS-Core.UX-CORE
fix: install patches
PHCO_27344 B.11.00 sh-posix
PHCO_27418 B.11.00 ksh
PHCO_27763 B.11.00 csh

HP-UX B.10.20
=============
OS-Core.UX-CORE
fix: install patches
PHCO_27804 B.10.20 sh-posix
PHCO_27803 B.10.20 ksh
PHCO_27819 B.10.20 csh


END AFFECTED VERSIONS

B. Recommended solution

Retrieve and install all three the patches for each release
from itrc.hp.com:
PHCO_27345 B.11.11 sh-posix
PHCO_27019 B.11.11 ksh
PHCO_26561 B.11.11 csh

PHCO_27344 B.11.00 sh-posix
PHCO_27418 B.11.00 ksh
PHCO_27763 B.11.00 csh

PHCO_27804 B.10.20 sh-posix
PHCO_27803 B.10.20 ksh
PHCO_27819 B.10.20 csh

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. Please note that installing the patches
listed in the Security Patch Matrix will completely
implement a security bulletin _only_ if the MANUAL ACTIONS
field specifies "No."

The Security Patch Check tool can verify that a security
bulletin has been implemented on HP-UX 11.XX systems providing
that the fix is completely implemented in a patch with no
manual actions required. The Security Patch Check tool cannot
verify fixes implemented via a product upgrade.

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".

The PGP key used to sign this bulletin is available from
several PGP Public Key servers. The key identification
information is:

2D2A7D59
HP Security Response Team (Security Bulletin signing only)

Fingerprint =
6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

If you have problems locating the key please write to
[email protected] Please note that this key is
for signing bulletins only and is not the key returned
by sending 'get key' to [email protected]


D. To report new security vulnerabilities, send email to

[email protected]

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 [email protected]

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(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.
________________________________________________________________

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