Published:
28 October 1997
Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-97.134 -- Sun Security Bulletin #00155
nis_cachemgr
29 October 1997
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Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in nis_cachemgr. This vulnerability may allow attackers to
add bogus directory objects to the global shared cache, in effect specifying
rogue NIS+ servers that are under their control.
The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no
control over its content. As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
Contact information for Sun is included in the Security Bulletin below.
If you have any questions or need further information, please contact them
directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/information/advisories.html
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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Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00155
Date: October 28, 1997
Cross-Ref:
Title: nis_cachemgr
________________________________________________________________________________
Permission is granted for the redistribution of this Bulletin, so long as
the Bulletin is not edited and is attributed to Sun Microsystems. Portions
may also be excerpted for re-use in other security advisories so long as
proper attribution is included.
Any other use of this information without the express written consent of
Sun Microsystems is prohibited. Sun Microsystems expressly disclaims all
liability for any misuse of this information by any third party.
________________________________________________________________________________
1. Bulletins Topics
Sun announces the release of patches for Solaris 2.5.1, 2.5, and 2.4
(SunOS 5.5.1, 5.5, and 5.4) which relate to a vulnerability in
nis_cachemgr.
Sun estimates that the release of a patch for Solaris 2.3 (SunOS 5.3)
that relate to the same vulnerability will be available within 4 weeks
of the date of this bulletin.
Sun strongly recommends that you install the patches listed in section 4
immediately on systems running SunOS 5.5.1, 5.5, and 5.4 which use
NIS+.
2. Who is Affected
Vulnerable: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
5.4, 5.4_x86, 5.3
Not vulnerable: All other supported versions of SunOS.
The vulnerability does not exist in Solaris 2.6.
3. Understanding the Vulnerability
NIS+ clients run nis_cachemgr, a NIS+ utility that caches location
information about NIS+ servers. This vulnerability, if exploited, allows
attackers to add bogus directory objects to the global shared cache, in
effect specifying rogue NIS+ servers that are under their control.
4. List of Patches
The vulnerability in nis_cachemgr is fixed by the following patches:
OS version Patch ID
__________ ________
SunOS 5.5.1 103612-33
SunOS 5.5.1_x86 103613-32
SunOS 5.5 103187-29
SunOS 5.5_x86 103188-29
SunOS 5.4 101973-32
SunOS 5.4_x86 101974-32
SunOS 5.3 101318-89 (to be released in 4 weeks)
5. Checksum Table
The checksum table below shows the BSD checksums (SunOS 5.x: /usr/ucb/sum),
SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures
for the above-mentioned patches that are available from:
<URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>
These checksums may not apply if you obtain patches from your answer
centers.
File Name BSD SVR4 MD5
_______________ __________ __________ ________________________________
103612-33.tar.Z 42409 3248 60555 6495 63408A137DBE6BEEDAECFA49674F0E5A
103613-32.tar.Z 08972 2939 41390 5878 E613588ADA2845DA2CEDE801FE247ED2
103187-29.tar.Z 47938 3240 14585 6479 D681C0BB1C4267418AEB20F56DDE7FD3
103188-29.tar.Z 36871 2919 14150 5838 F7184B433BF9EDCBA99E81D2039F355A
101973-32.tar.Z 55144 956 44485 1911 A802DA901090B52A27BDC6AE0D386C13
101974-32.tar.Z 41770 826 48991 1652 91AB26639B6CB0902ADE354999751826
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APPENDICES
A. Patches listed in this bulletin are available to all Sun customers via
World Wide Web at:
<URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>
Customers with Sun support contracts can also obtain patches from local
Sun answer centers and SunSITEs worldwide.
B. Sun security bulletins are available via World Wide Web at:
<URL:http://sunsolve1.sun.com/sunsolve/secbulletins>
C. Sun Security Coordination Team's PGP key is available via World Wide Web
at:
<URL:http://sunsolve1.sun.com/sunsolve/secbulletins/SunSCkey.txt>
D. To report or inquire about a security problem with Sun software, contact
one or more of the following:
- Your local Sun answer centers
- Your representative computer security response team, such as CERT
- Sun Security Coordination Team. Send email to:
security-alert@sun.com
E. To receive information or subscribe to our CWS (Customer Warning System)
mailing list, send email to:
security-alert@sun.com
with a subject line (not body) containing one of the following commands:
Command Information Returned/Action Taken
_______ _________________________________
help An explanation of how to get information
key Sun Security Coordination Team's PGP key
list A list of current security topics
query [topic] The email is treated as an inquiry and is forwarded to
the Security Coordination Team
report [topic] The email is treated as a security report and is
forwarded to the Security Coordinaton Team. Please
encrypt sensitive mail using Sun Security Coordination
Team's PGP key
send topic A short status summary or bulletin. For example, to
retrieve a Security Bulletin #00138, supply the
following in the subject line (not body):
send #138
subscribe Sender is added to our mailing list. To subscribe,
supply the following in the subject line (not body):
subscribe cws your-email-address
Note that your-email-address should be substituted
by your email address.
unsubscribe Sender is removed from the CWS mailing list.
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