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AUSCERT External Security Bulletin Redistribution
ESB-98.064 -- Sun Security Bulletin #00168
Vulnerability in mountd
30 Apr 1998
Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in the mountd program under various versions of SunOS. This
vulnerability if exploited, allows the attacker to obtain information
about any file that exists on the NFS server even though the file in
question is not a part of the NFS exported file system.
The following security bulletin is provided as a service to AusCERT's
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information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. It will
not be updated when the original bulletin is. If downloading at a later
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authors to ensure that the information is still current.
Contact information for Sun Microsystems, Inc. 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:
If you believe that your system has been compromised, contact AusCERT or
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On call after hours for emergencies.
Facsimile: (07) 3365 7031
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Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00168
Date: April 29, 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,
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OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY
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If any of the above provisions are held to be in violation of applicable law,
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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, 5.3), which relate to
a vulnerability in rpc.mountd.
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 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
mountd is an RPC server that handles NFS file system mount requests.
A vulnerability has been discovered with mountd which, if exploited,
allows the attacker to obtain information about any file that exists
on the NFS server even though the file in question is not a part of
the NFS exported file system.
4. List of Patches
The following patches are available in relation to the above problem.
SunOS Patch ID
SunOS 5.6 105615-03
SunOS 5.6_x86 105616-03
SunOS 5.5.1 104220-03
SunOS 5.5.1_x86 104221-03
SunOS 5.5 104223-02
SunOS 5.5_x86 104224-02
SunOS 5.4 102685-02
SunOS 5.4_x86 102686-02
SunOS 5.3 102654-02
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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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