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Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0312-304
Originally issued: 01 Dec 2003
SSRT3630 Security Vulnerability in shar(1)
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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: shar(1) creates tmp files insecurely.

IMPACT: Possible filesystem damage, execution of arbitrary
code, or Denial of Service.

PLATFORM: HP9000 servers running HP-UX versions B.11.00, B.11.04,
and B.11.11.

SOLUTION: Apply the appropriate patch from itrc.hp.com:
PHCO_29010 B.11.11
PHCO_29697 B.11.04
PHCO_28954 B.11.00

MANUAL ACTIONS: Yes
If the /tmp directory is not trusted
specify a trusted directory in the
TMPDIR environment variable. Shar archives
which do not use TMPDIR should be modified
as discussed below.

AVAILABILITY: All patches are available now on <itrc.hp.com>
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A. Background
The shar(1) utility, which among other things is used to
package HP-UX patches, creates temporary files with
predictable names on /tmp. If shar files are unpacked on
a system where /tmp cannot be trusted a potential
vulnerability exists.

Shar archives created with the new version of shar(1) can
specify a safe directory for temporary file creation
using the TMPDIR environment variable. Shar archives created
with previous versions of shar(1) will still use /tmp
even after the recommended patches are installed.

There are additions to the man page for shar(1) describing
the new environment variable TMPDIR.

The following procedure can be used to replace references to
/tmp with TMPDIR in existing shar archives.

$ cat addTMPDIR.awk
/..@EOF/ {scan_off=1}
/^@EOF/ {scan_off=0}
/unpacker <<.@eof./ {scan_off=1}
{
if(scan_off != 1) {
gsub ("/tmp", "$TMPDIR")
}
print $0
}

$ cp PHCO_29010 PHCO_29010.orig
$ export TMPDIR=$HOME
$ awk -f addTMPDIR.awk PHCO_29010.orig >PHCO_29010
$ sh PHCO_29010
x - PHCO_29010.text
x - PHCO_29010.depot [non-ascii]


NOTE: This issue does not impact HP Tru64 UNIX nor
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.CMDS-AUX
fix: install PHCO_29010 or subsequent and unpack patches
using the new procedure.

HP-UX B.11.04
=============
OS-Core.CMDS-AUX
fix: install PHCO_29697 or subsequent and unpack patches
using the new procedure.

HP-UX B.11.00
=============
OS-Core.CMDS-AUX
fix: install PHCO_28954 or subsequent and unpack patches
using the new procedure.

END AFFECTED VERSIONS

B. Recommended solution

Retrieve and install the patches for each applicable release
from <itrc.hp.com>:

PHCO_29010 B.11.11
PHCO_29697 B.11.04
PHCO_28954 B.11.00

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)
<security-alert@hp.com>
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If you have problems locating the key please write to
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D. 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.

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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 do***ent 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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--
Yours truly,
HP S/W Security Team
WTEC Cupertino, California


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