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AUSCERT External Security Bulletin Redistribution
ESB-98.057 -- Sun Security Bulletin #00167
Vulnerability in rpcbind
9 Apr 1998
Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in the rcpbind program under various versions of SunOS.
This vulnerablility if exploited, can be used to overwrite arbitrary files
and permit unauthorized system access.
The following security bulletin is provided as a service to AUSCERT's
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Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00167
Date: April 8, 1998
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
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.
A. Patches listed in this bulletin are available to all Sun customers via
World Wide Web at:
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Copyright 1998 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
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Security Bulletin may be reproduced and distributed, provided that this
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