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