__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
___ __ __ _ ___
/ | /_\ /
\___ __|__ / \ \___
__________________________________________________________
INFORMATION BULLETIN
SunOS rpcbind Vulnerability
April 8, 1998 23:00 GMT Number H-70a
________________________________________________________________________
PROBLEM: A vulnerability has been identified in the rpcbind function
in the libc library.
PLATFORM: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86, 5.4, 5.4_x86,
and 5.3.
DAMAGE: This vulnerability may allow an attacker to gain
unauthorized
access if exploited.
SOLUTION: Apply vendor patches specified below.
________________________________________________________________________
VULNERABILITY It is highly recommended that patches be installed
ASSESSMENT: immediately.
________________________________________________________________________
[ Appended on April 8, 1998 with additional vendor information ]
[ Start Sun Microsystems, Inc Advisory ]
- ------------------------------------------------------------------------------
Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00142
Date: June 4 1997
Cross-Ref:
Title: Vulnerability in rpcbind
- ------------------------------------------------------------------------------
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, 2.4, and 2.3
(SunOS 5.5.1, 5.5, 5.4, and 5.3), that relate to a vulnerability in the
rpcbind program, which can aid an attacker to gain unauthorized access if
exploited.
Sun strongly recommends that you install the patches listed in section 4
immediately on every affected system.
2. Who is Affected
Vulnerable: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
5.4, 5.4_x86, and 5.3.
Not vulnerable: All other supported versions of SunOS
This vulnerability is fixed in the upcoming release of Solaris.
3. Understanding the Vulnerability
The rpcbind program is a server that converts RPC program numbers into
universal addresses. When an RPC service is started, it tells rpcbind the
address at which it is listening, and the RPC program numbers it is
prepared to serve. When a client wishes to make an RPC call to a given
program number, it first contacts rpcbind on the server machine to
determine the address where RPC requests should be sent.
Under Solaris 2.x, rpcbind listens not only on TCP port 111 and UDP port
111, but also on a UDP port number greater than 32770. The exact number
depends on the OS release and architecture. This results in a large number
of packet filters which intend to block access to rpcbind/portmapper being
ineffective. Instead of sending requests to TCP or UDP port 111, the
attacker simply sends them to the other UDP port. This vulnerability
allows
an attacker to obtain remote RPC program information even if TCP or UDP
port 111 is being filtered. It can also aid an attacker to gain
unauthorized access to hosts running vulnerable versions of the software.
4. List of Patches
The vulnerability relating to rpcbind is fixed by the following patches:
OS version Patch ID
---------- --------
SunOS 5.5.1 104331-02
SunOS 5.5.1_x86 104332-02
SunOS 5.5 104357-02
SunOS 5.5_x86 104358-02
SunOS 5.4 102070-03
SunOS 5.4_x86 102071-03
SunOS 5.3 102034-02
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:
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
- --------------- --------- --------- --------------------------------
104331-02.tar.Z 64512 111 17253 222 29C2D5649C56A3D64E1F1DFCE3783842
104332-02.tar.Z 56808 111 23404 221 4B5D28F4A686166C4C147BE4E9563B8C
104357-02.tar.Z 27488 111 31772 222 316B03F737FC61DC09877C2BB822E7EE
104358-02.tar.Z 22598 110 46888 220 1665E8724D0A3DB401A00BE812630A37
102070-03.tar.Z 32763 100 14089 200 31FB11BC9D89A6D540F87624D4A2CFAE
102071-03.tar.Z 21217 100 18859 199 76DDAF2CAE25535A9AE932F3B0C98E3A
102034-02.tar.Z 23648 100 49973 199 243CD25673D87D0277F5CFE06E327347
- ------------------------------------------------------------------------------
Sun acknowledges with thanks Secure Networks, Inc. for their assistance in the
preparation of this bulletin.
- ------------------------------------------------------------------------------
APPENDICES
A. Patches listed in this bulletin are available to all Sun customers via
World Wide Web at:
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. 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
C. 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
LIST A list of current security topics
QUERY [topic] The mail containing the question is relayed to
the Security Coordination Team for response.
REPORT [topic] The mail containing the text is treated as a
security report and forwarded to the Security
Coordination Team. We do not recommend that detailed
problem descriptions be sent in plain text.
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 our mailing list.
[ End Sun Microsystems, Inc Advisory ]
[ Append Sun Microsystems, Inc Advisory ]
________________________________________________________________________________
Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00167
Date: April 8, 1998
Cross-Ref:
Title: rpcbind
________________________________________________________________________________
The information contained in this Security Bulletin is provided "AS IS."
Sun makes no warranties of any kind whatsoever with respect to the information
contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS,
REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.
IN NO EVENT WILL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY LOST REVENUE,
PROFIT OR DATA, OR FOR DIRECT, SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL
OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY
ARISING OUT OF THE USE OF OR INABILITY TO USE THE INFORMATION CONTAINED IN
THIS SECURITY BULLETIN, EVEN IF SUN MICROSYSTEMS, INC. HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.
If any of the above provisions are held to be in violation of applicable law,
void, or unenforceable in any jurisdiction, then such provisions are waived
to the extent necessary for this disclaimer to be otherwise enforceable in
such jurisdiction.
________________________________________________________________________________
1. Bulletins Topics
Sun announces the release of patches for Solaris(tm) 2.6, 2.5.1, 2.5,
2.4, and 2.3 (SunOS(tm) 5.6, 5.5.1, 5.5, 5.4, and 5.3), which relate
to a vulnerability in the rpcbind program.
Sun recommends that you install the patches listed in section 4
immediately on systems running SunOS 5.6, 5.5.1, 5.5, 5.4, and 5.3.
2. Who is Affected
Vulnerable: SunOS versions 5.6, 5.6_x86, 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
5.4, 5.4_x86, and 5.3.
Not vulnerable: All other supported versions of SunOS.
3. Understanding the Vulnerability
The rpcbind program is a server that converts RPC program numbers into
universal addresses. When an RPC service is started, it registers itself
with rpcbind by telling rpcbind the address at which the RPC service is
listening, and the RPC program numbers it is prepared to serve. A
vulnerability has been discovered in rpcbind which, if exploited, can be
used to overwrite arbitrary files and permit unauthorized system access.
4. List of Patches
The following patches are available in relation to the above problem.
OS version Patch ID
__________ ________
SunOS 5.6 105216-03
SunOS 5.6_x86 105217-03
SunOS 5.5.1 104331-07
SunOS 5.5.1_x86 104332-07
SunOS 5.5 104357-05
SunOS 5.5_x86 104358-05
SunOS 5.4 102070-06
SunOS 5.4_x86 102071-06
SunOS 5.3 102034-05
_______________________________________________________________________________
Sun acknowledges with thanks AUSCERT for their assistance in this matter.
_______________________________________________________________________________
APPENDICES
A. Patches listed in this bulletin are available to all Sun customers via
World Wide Web at:
<URL:http://sunsolve.sun.com/sunsolve/pubpatches/patches.html>
B. Checksums for the patches listed in this bulletin are available via
World Wide Web at:
<URL:http://sunsolve.sun.com/sunsolve/pubpatches/patches.html>
C. Sun security bulletins are available via World Wide Web at:
<URL:http://sunsolve.sun.com/sunsolve/secbulletins>
D. Sun Security Coordination Team's PGP key is available via World Wide Web
at:
<URL:http://sunsolve.sun.com/sunsolve/secbulletins/SunSCkey.txt>
E. 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
F. 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.
________________________________________________________________________________
Copyright 1998 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries. This
Security Bulletin may be reproduced and distributed, provided that this
Security Bulletin is not modified in any way and is attributed to
Sun Microsystems, Inc. and provided that such reproduction and distribution
is performed for non-commercial purposes.
[ End Sun Microsystems, Inc Advisory ]
________________________________________________________________________
CIAC wishes to acknowledge the contributions of Sun Microsystems,
Secure Networks, Inc. for the information contained in this bulletin.
________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
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