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AUSCERT External Security Bulletin Redistribution
ESB-2002.321 -- HP-UX security bulletins digest
HPSBUX0206-195 - Sec. Vulnerability in OpenSSH on HP-UX
1 July 2002
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AusCERT Security Bulletin Summary
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Operating System: HP-UX release 11.00 with T1471AA SSH
HP-UX release 11.11 with T1471AA SSH
Platform: HP 9000 Servers
Impact: Execute Arbitrary Code/Commands
Access Required: Remote
Ref: AL-2002.05
AA-2002.05
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Document ID: HPSBUX0206-195
Date Loaded: 20020626
Title: Sec. Vulnerability in OpenSSH on HP-UX
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HEWLETT-PACKARD COMPANY SECURITY BULLETIN: #0195,
Originally issued: 27 June 2002
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The information in the following Security Advisory 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 Advisory as
soon as possible.
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PROBLEM: OpenSSH input validation errors can cause faults from
remote hosts in SSH protocol version 2.
PLATFORM: HP 9000 Servers running HP-UX release 11.00, and 11.11
only with the T1471AA SSH product installed.
DAMAGE: Possible privilege increases, from remote locations.
SOLUTION: Disable PAMAuthenticationViaKbdInt in sshd_config.
MANUAL ACTIONS: Edit sshd_config appropriately.
AVAILABILITY: n/a
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A. Background
Pursuant to the CERT Advisory CA-2002-18 on OpenSSH,
Hewlett-Packard Company has learned of a defect in the
code in SSH, product number T1471AA.
B. Fixing the problem
As a short-term solution, disable PAMAuthenticationViaKbdInt
in the sshd_config file; i.e.,
PAMAuthenticationViaKbdInt no
The CERT advisory mentions adding the following line to
/etc/ssh/sshd_config:
ChallengeResponseAuthentication no
NOTE:
ChallengeResponseAuthentication is not used in the HP product.
HP is working to produce a patch for its version which is based
on OpenSSH release 3.1p1. This advisory will be updated to a
bulletin when that patch is released.
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.
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.
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.itrc.hp.com:~ftp/export/patches/hp-ux_patch_matrix
On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".
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.
Permission is granted for copying and circulating this
Advisory to Hewlett-Packard (HP) customers (or the Internet
community) for the purpose of alerting them to problems,
if and only if, the Advisory 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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