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Sun Security Bulletin #00148
From: aleph1 () DFW NET (Aleph One)
Date: Wed, 30 Jul 1997 13:16:20 -0500


                   Sun Microsystems, Inc. Security Bulletin

Bulletin Number:        #00148
Date:                   July 30
Title:                  Vulnerability in NIS+

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 2.4 and 2.3 (SunOS 5.4
    and 5.3) which relate to a vulnerability in NIS+.

    Sun strongly recommends that you install the patches listed in section 4
    immediately on systems running SunOS 5.4 and 5.3 which use NIS+.

2.  Who is Affected

    Vulnerable:  SunOS versions 5.4, 5.4_x86, and 5.3 which use NIS+.

    Not Vulnerable: SunOS 4.1.3_U1, 4.1.4, 5.5, 5.5_x86, 5.5.1, 5.5.1_x86,
                    and the upcoming version of Solaris.

3.  Understanding the Vulnerability

    NIS+ is a network-wide name service that runs under Solaris. It can be
    selected as the name service in /etc/nsswitch.conf. If NIS+ is selected,
    programs with setuid root permissions will link nss_nisplus.so.1 which
    is susceptible to a buffer overflow vulnerability. This vulnerability may
    allow non-privileged users to gain root privileges.

4.  List of Patches

    The vulnerability in NIS+ is fixed by the following patches:

    OS version          Patch ID
    __________          ________
    SunOS 5.4           102277-03
    SunOS 5.4_x86       102278-03
    SunOS 5.3           101736-04

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
_______________   ________   _________    ________________________________
102277-03.tar.Z   10681 76   2019 152     4585727103680C70301D2F7679C9EA6D
102278-03.tar.Z   52108 76   53872 151    5040EB6980280C729051927BFB5C8130
101736-04.tar.Z   27381 77   18741 153    0AC81583908220A4D92CF5C091D6212C

Sun is a member of FIRST, the Forum of Incident Response and Security Teams.
For more information about FIRST, visit the FIRST web site at

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.  Sun security bulletins are available via World Wide Web at:


C.  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

D.  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:

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