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AUSCERT External Security Bulletin Redistribution
ESB-2001.140 -- HP Support Information Digest HPSBUX0104-148
Sec. Vulnerability in xntpd(1M)
10 April 2001
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AusCERT Security Bulletin Summary
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Product: ntp
Vendor: Hewlett-Packard
Operating System: HP-UX 10.XX
HP-UX 11.XX
Platform: HP9000 Series 700
HP9000 Series 800
Impact: Denial of Service
Increased Privileges
Access Required: Remote
Ref: ESB-2001.138
ESB-2001.139
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Document ID: HPSBUX0104-148
Date Loaded: 20010407
Title: Sec. Vulnerability in xntpd(1M)
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HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #0148, 06 Apr. '01
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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: The HP-UX NTP daemon contains an exploitable vulnerability.
PLATFORM: HP9000 Series 700/800 running HP-UX releases 10.XX and 11.XX.
DAMAGE: Possible denial of service, increase of priviledge.
SOLUTION: Install the workaround configuration detailed below.
AVAILABILITY: Patches are currently being developed, whereupon this
advisory will be upgraded to a bulletin.
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I.
A. Background
A buffer overflow has been discovered on various Unix-derived
operating systems in its NTP daemon. Hewlett-Packard Company
ships xntpd on HP-UX releases and has determined that it too,
is vulnerable.
B. Recommended solution
Hewlett-Packard Company recommends that xntpd be shut down
on all systems not absolutely needing time-of-day synchronization
with Internet standard time servers.
On those remaining time-sensitive systems modify the default
configuration file (/etc/ntp.conf) to use the "restrict" clause,
to restrict all but allow some.
We provide an example of a simple configuration. Please refer
to the man (1M) xntpd for further configuration details.
# This server syncs from server 192.255.2.3 and provides
# time services to client 192.27.16.30, yet
# blocks all others.
server 192.255.2.3 prefer
server 127.127.1.1
# allow this client full access
restrict 192.27.16.30
# allow this server full access
restrict 192.255.2.3
# you need both of the following for the localhost
restrict 127.0.0.1
restrict 127.127.1.1
# block everything else
restrict default ignore
NOTE: Patches are currently in development.
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
Under the Maintenance and Support Menu (Electronic Support
Center): click on the "more..." link. Then -
Use the 'Login' tab at the left side of the screen to login
using your ID and password. Check with your system
administrator to see if you have an existing login or use
the "Register" button at the left to create a login. You
will need to login in order to gain access to many areas of
the ITRC. Remember to save the User ID assigned to you, and
your password.
Under the Maintenance and Support Menu, click on the "more..."
link. 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 "hp security bulletins archive" near the bottom.
Once in the archive the top link is to our current Security
Patch Matrix. Updated daily, this matrix categorizes security
patches by platform/OS release, and by bulletin topic.
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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This security bulletin is provided as a service to AusCERT's members. As
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NOTE: This is only the original release of the security bulletin. It may
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Previous advisories and external security bulletins can be retrieved from:
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If you believe that your system has been compromised, contact AusCERT or
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Teams).
Internet Email: auscert@auscert.org.au
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