-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =============================================================================== >> CERT-NL, 01-Mar-2000 << >> All CERT-NL information has been moved to http://cert.surfnet.nl. Links << >> to CERT-NL information contained in this advisory are therefore outdated. << >> << >> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the << >> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the << >> complete CERT-CC advisory texts: http://www.cert.org << =============================================================================== =============================================================================== Security Advisory CERT-NL =============================================================================== Author/Source : CERT-NL Index : S-92-13 Distribution : SURFnet Constituency Page : 1 Classification: External Version: final Subject : SunOS NIS Vulnerability Date : 04-jun-92 =============================================================================== CERT-NL (SURFnet Computer Emergency Response Team) has received information concerning a security problem in SunOS NIS. CERT-NL wishes to thank CERT/CC for bringing this to our attention. =========================================================================== CA-92:13 CERT Advisory June 4, 1992 SunOS NIS Vulnerability - --------------------------------------------------------------------------- The Computer Emergency Response Team/Coordination Center (CERT/CC) has received information concerning several vulnerabilities with NIS under Sun Microsystems, Inc. SunOS. These vulnerabilities exist in NIS under SunOS 4.1, 4.1.1, and 4.1.2, and may or may not exist in earlier versions of NIS. Sun has provided fixes for SunOS 4.1, 4.1.1, and 4.1.2 for these vulnerabilities. The patch file containing these fixes is available through your local Sun Answer Center and through anonymous ftp from ftp.uu.net (137.39.1.9) in the /systems/sun/sun-dist directory. Note that these fixes will probably not be compatible with SunOS 4.0.3 and earlier versions of the operating system. Fix PatchID Filename Checksum /usr/etc/{ypserv,ypxfrd,portmap} 100482-2 100482-02.tar.Z 53416 284 Please note that Sun will occasionally update patch files. If you find that the checksum is different, please contact Sun or the CERT/CC for verification. - --------------------------------------------------------------------------- I. Description A security vulnerability exists under NIS allowing unauthorized access to NIS information. II. Impact A user on a remote host can obtain copies of the NIS maps from a system running NIS. The remote user can attempt to guess passwords for the system using the obtained NIS password map information. III. Solution A. Obtain and install the patch from Sun or from ftp.uu.net following the instructions provided in the "README" file. 1. As root, rename the existing versions of /usr/etc/{ypserv,ypxfrd,portmap} and modify the permissions to prevent misuse. # mv /usr/etc/ypserv /usr/etc/ypserv.orig # mv /usr/etc/ypxfrd /usr/etc/ypxfrd.orig # mv /usr/etc/portmap /usr/etc/portmap.orig # chmod 0400 /usr/etc/ypserv.orig # chmod 0400 /usr/etc/ypxfrd.orig # chmod 0400 /usr/etc/portmap.orig 2. Copy the new binaries into the /usr/etc directory. # cp `arch`/{4.1, 4.1.1, 4.1.2}/ypserv /usr/etc/ypserv # cp `arch`/{4.1, 4.1.1, 4.1.2}/ypxfrd /usr/etc/ypxfrd # cp `arch`/{4.1, 4.1.1, 4.1.2}/portmap /usr/etc/portmap # chown root /usr/etc/ypserv /usr/etc/ypxfrd /usr/etc/portmap # chmod 755 /usr/etc/ypserv /usr/etc/ypxfrd /usr/etc/portmap 3. Copy the securenets file to the /var/yp directory. Any site that has an existing /var/yp/securenets file should rename it prior copying the new version of the file. # cp `arch`/{4.1, 4.1.1, 4.1.2}/securenets /var/yp # chown root /var/yp/securenets # chmod 644 /var/yp/securenets 4. Edit the /var/yp/securenets file to reflect the correct configuration for your site. See the "README" file for details of the file syntax and special instructions for hosts with multiple Ethernet interfaces. The file should not contain any blank lines. 5. Reboot the system to invoke the new binaries. - --------------------------------------------------------------------------- The CERT/CC would like to thank Casper Dik of the University of Amsterdam, The Netherlands, and Peter Lamb of the Division of Information Technology, Commonwealth Scientific and Industrial Research Organization, Australia, for their assistance. We also wish to thank Sun Microsystems, Inc. for their response to this vulnerability. - --------------------------------------------------------------------------- If you believe that your system has been compromised, contact CERT/CC or your representative in FIRST (Forum of Incident Response and Security Teams). Internet E-mail: cert@cert.org Telephone: 412-268-7090 (24-hour hotline) CERT/CC personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4), on call for emergencies during other hours. Computer Emergency Response Team/Coordination Center (CERT/CC) Software Engineering Institute Carnegie Mellon University Pittsburgh, PA 15213-3890 Past advisories, information about FIRST representatives, and other information related to computer security are available for anonymous ftp from cert.org (192.88.209.5). ============================================================================== CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet is the Dutch network for educational, research and related institutes. CERT-NL is a member of the Forum of Incident Response and Security Teams (FIRST). All CERT-NL material is available under: http://cert.surfnet.nl/ In case of computer or network security problems please contact your local CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer please address the appropriate (local) CERT/security-team). CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer, i.e. UTC+0100 in winter and UTC+0200 in summer (DST). Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS Phone: +31 302 305 305 BUSINESS HOURS ONLY Fax: +31 302 305 329 BUSINESS HOURS ONLY Snailmail: SURFnet bv Attn. CERT-NL P.O. Box 19035 NL - 3501 DA UTRECHT The Netherlands NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES: THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED* PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU. =============================================================================== -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.1i iQA/AwUBOL6V+DSYjBqwfc9jEQIAFACeIDexo7atK28rY+w9Fj9PosyQmIkAoOeT einpyjjWaHQpMyYSHyQgd6rY =aSRl -----END PGP SIGNATURE-----