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CERT* Vendor-Initiated Bulletin VB-97.03
June 17, 1997

Topic:  Vulnerability in rpcbind
Source: Sun Microsystems, Inc.

To aid in the wide distribution of essential security information, the CERT
Coordination Center is forwarding the following information from Sun
Microsystems, Inc. Sun urges you to act on this information as soon as
possible. Their contact information is included in the forwarded text
below; please contact them if you have any questions or need further

=======================FORWARDED TEXT STARTS HERE============================
- ------------------------------------------------------------------------------
                   Sun Microsystems, Inc. Security Bulletin
Bulletin Number:        #00142
Date:                   June 4 1997
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
    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:
    These checksums may not apply if you obtain patches from your answer

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.
- ------------------------------------------------------------------------------


A.  Patches listed in this bulletin are available to all Sun customers via 
    World Wide Web at:
    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:
                This email address is being protected from spambots. You need JavaScript enabled to view it.

C.  To receive information or subscribe to our CWS (Customer Warning System) 
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    with a subject line (not body) containing one of the following commands:

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        QUERY [topic]   The mail containing the question is relayed to
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                                SEND #138

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                                SUBSCRIBE cws your-email-address
                        Note that your-email-address should be substituted
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        UNSUBSCRIBE     Sender is removed from our mailing list.
- ------------------------------------------------------------------------------

========================FORWARDED TEXT ENDS HERE=============================

If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident Response
and Security Teams (FIRST). See  

We strongly urge you to encrypt any sensitive information you send by email.
The CERT Coordination Center can support a shared DES key and PGP. Contact 
the CERT staff for more information.

Location of CERT PGP key

CERT Contact Information
- ------------------------
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Phone    +1 412-268-7090 (24-hour hotline)
                CERT personnel answer 8:30-5:00 p.m. EST
                (GMT-5)/EDT(GMT-4), and are on call for
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Fax      +1 412-268-6989

Postal address
        CERT Coordination Center
        Software Engineering Institute
        Carnegie Mellon University
        Pittsburgh PA 15213-3890

CERT publications, information about FIRST representatives, and other
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