************************************************************************** Security Bulletin 9548 DISA Defense Communications System December 5, 1995 Published by: DISN Security Coordination Center (SCC@NIC.DDN.MIL) 1-(800) 365-3642 DEFENSE INFORMATION SYSTEM NETWORK SECURITY BULLETIN The DISN SECURITY BULLETIN is distributed by the DISN SCC (Security Coordination Center) under DISA contract as a means of communicating information on network and host security exposures, fixes, and concerns to security and management personnel at DISN facilities. Back issues may be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5] using login="anonymous" and password="guest". The bulletin pathname is scc/sec-yynn (where "yy" is the year the bulletin is issued and "nn" is a bulletin number, e.g. scc/sec-9544.txt). These are also available at our WWW site, http://nic.ddn.mil. ************************************************************************** + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + ! ! ! The following important advisory was issued by the Automated ! ! Systems Security Incident Support Team (ASSIST) and is being ! ! relayed unedited via the Defense Information Systems Agency's ! ! Security Coordination Center distribution system as a means ! ! of providing DISN subscribers with useful security information. ! ! ! + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + -----BEGIN PGP SIGNED MESSAGE----- <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Automated Systems Security Incident Support Team _____ ___ ___ _____ ___ _____ | / /\ / \ / \ | / \ | | / Integritas / \ \___ \___ | \___ | | < et /____\ \ \ | \ | | \ Celeritas / \ \___/ \___/ __|__ \___/ | |_____\ <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Bulletin 95-45 Release date: 4 December, 1995, 3:45 PM EST (GMT -5) SUBJECT: SGI's Patch for Telnetd Environment Vulnerability. Summary: Silicon Graphics provides this information freely to the SGI community for its consideration, interpretation and implementation. Silicon Graphics recommends that this information be acted upon as soon as possible. Silicon Graphics will not be liable for any consequential damages arising from the use of, or failure to use or use properly, any of the instructions or information in this Security Advisory. As first reported, potential exploits could be directed at telnet daemons that support RFC 1408 or 1572, both titled the ``Telnet Environment Option,'' running on systems that also support shared object libraries (See ASSIST's bulletin #95-42 for additional background information). To correct this problem Silicon Graphics Inc. offers the replacement of the telnetd program for IRIX versions 5.2, 5.3, 6.0, 6.0.1 and 6.1 which are vulnerable. BACKGROUND: As first reported by the MIT Kerberos Development Team, potential exploits could be directed at telnet daemons that were RFC 1408 and/or RFC 1572 compliant. These RFCs are the defining documents for the Telnet Environment Option" which provides the ability to transfer environment variables from one system to another when using the telnet program. Silicon Graphics has investigated this issue and recommends the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be done on ALL SGI systems running IRIX 5.2, 5.3, 6.0, 6.0.1and 6.1. This issue will be corrected in future releases of IRIX. IMPACT: Both local and remote users may be able to become root on a targeted system. RECOMMENDED SOLUTIONS: The solution for this issue is a replacement of the telnetd program for those versions which are vulnerable. The following patches have been generated for the vulnerable versions. SGI freely provides them for the community. _______________________________________________________________________ **** IRIX 3.x **** This version of IRIX is not vulnerable. No action is required. **** IRIX 4.x **** This version of IRIX is not vulnerable. No action is required. **** IRIX 5.0.x, 5.1.x **** For the IRIX operating systems versions 5.0.x, 5.1.x, an upgrade to 5.2 or better is required first. When the upgrade is completed, then the patches described in the next sections "**** IRIX 5.2, 5.3, 6.0, 6.0.1, 6.1 ***" or "**** IRIX 6.1 ****" can be applied. **** IRIX 5.2, 5.3, 6.0, 6.0.1 **** For the IRIX operating system versions 5.2, 5.3, 6.0, and 6.0.1, an inst-able patch has been generated and made available via anonymous ftp and/or your service/support provider. The patch is number 1020 and will install on IRIX 5.2, 5.3, 6.0 and 6.0.1 . The SGI anonymous ftp site is sgigate.sgi.com (204.94.209.1). Patch 1020 can be found in the following directories on the ftp server: ~ftp/Security or ~ftp/Patches/5.2 ~ftp/Patches/5.3 ~ftp/Patches/6.0 ~ftp/Patches/6.0.1 ##### Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.1020 Algorithm #1 (sum -r): 31057 8 README.patch.1020 Algorithm #2 (sum): 40592 8 README.patch.1020 MD5 checksum: 02F06ECD6240015F8DF82A99EC01E911 Filename: patchSG0001020 Algorithm #1 (sum -r): 07232 2 patchSG0001020 Algorithm #2 (sum): 47310 2 patchSG0001020 MD5 checksum: DA2341626FAEB9D67BA85FA3465BA9D9 Filename: patchSG0001020.eoe1_sw Algorithm #1 (sum -r): 22449 62 patchSG0001020.eoe1_sw Algorithm #2 (sum): 36518 62 patchSG0001020.eoe1_sw MD5 checksum: 936019F2CC9AB6CAE0D2DF611D461475 Filename: patchSG0001020.eoe2_sw Algorithm #1 (sum -r): 29899 43 patchSG0001020.eoe2_sw Algorithm #2 (sum): 12088 43 patchSG0001020.eoe2_sw MD5 checksum: 19A9C0BCB6F178E7EDF86850A1CF81D1 Filename: patchSG0001020.idb Algorithm #1 (sum -r): 64615 2 patchSG0001020.idb Algorithm #2 (sum): 46761 2 patchSG0001020.idb MD5 checksum: 487831A62C61FEAF5797859CBC1F018C **** IRIX 6.1 **** For the IRIX operating system version 6.1, an inst-able patch has been generated and made available via anonymous ftp and/or your service/support provider. The patch is number 1010 and will install on IRIX 6.1 . The SGI anonymous ftp site is sgigate.sgi.com (204.94.209.1). Patch 1010 can be found in the following directories on the ftp server: ~ftp/Security or ~ftp/Patches/6.1 ##### Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.1010 Algorithm #1 (sum -r): 43949 8 README.patch.1010 Algorithm #2 (sum): 38201 8 README.patch.1010 MD5 checksum: A8781E18A1F79716FBFE0B6E083DAB31 Filename: patchSG0001010 Algorithm #1 (sum -r): 08656 2 patchSG0001010 Algorithm #2 (sum): 45506 2 patchSG0001010 MD5 checksum: 34CF7F63073C225AD76150A4088E76AB Filename: patchSG0001010.eoe1_sw Algorithm #1 (sum -r): 12843 65 patchSG0001010.eoe1_sw Algorithm #2 (sum): 42034 65 patchSG0001010.eoe1_sw MD5 checksum: 82B8D375ECBF58A08286D393CE3980E7 Filename: patchSG0001010.eoe2_sw Algorithm #1 (sum -r): 01655 47 patchSG0001010.eoe2_sw Algorithm #2 (sum): 19507 47 patchSG0001010.eoe2_sw MD5 checksum: 1A5C5B5B84E0188A923C48419F716492 Filename: patchSG0001010.idb Algorithm #1 (sum -r): 31514 2 patchSG0001010.idb Algorithm #2 (sum): 46531 2 patchSG0001010.idb MD5 checksum: 9540492FEB00D41281AAF90AC3F67FA9 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ASSIST would like to thank SGI for information contained in this bulletin. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ASSIST is an element of the Defense Information Systems Agency (DISA), Center for Information Systems Security (CISS), that provides service to the entire DoD community. Constituents of the DoD with questions about ASSIST or computer security issues, can contact ASSIST using one of the methods listed below. Non-DoD organizations/ institutions, contact the Forum of Incident Response and Security Teams (FIRST) representative. To obtain a list of FIRST member organizations and their constituencies send an email to docserver@first.org with an empty "subject" line and a message body containing the line "send first-contacts". ASSIST Information Resources: To be included in the distribution list for the ASSIST bulletins, send your Milnet (Internet) e-mail address to assist-request@assist.mil. Back issues of ASSIST bulletins, and other security related information, are available from the ASSIST BBS at 703-607-4710, 327-4710, and through anonymous FTP from assist.mil (IP address 199.211.123.11). Note: assist.mil will only accept anonymous FTP connections from Milnet addresses that are registered with the NIC or DNS. If your system is not registered, you must provide your MILNET IP address to ASSIST before access can be provided. ASSIST Contact Information: PHONE: 800-357-4231, COMM 703-607-4700, DSN 327-4700. ELECTRONIC MAIL: assist@assist.mil. ASSIST BBS: COMM 703-607-4710, DSN 327-4710, leave a message for the "sysop". FAX: COMM 703-607-4735, DSN 607-4735 ASSIST uses Pretty Good Privacy (PGP) 2.6.2 as the digital signature mechanism for bulletins. PGP 2.6.2 incorporates the RSAREF(tm) Cryptographic Toolkit under license from RSA Data Security, Inc. A copy of that license is available via anonymous FTP from net-dist.mit.edu (IP 18.72.0.3) in the file /pub/PGP/rsalicen.txt, and through the world wide web from http://net-dist.mit.edu/pgp.html. In accordance with the terms of that license, PGP 2.6.2 may be used for non-commercial purposes only. Instructions for downloading the PGP 2.6.2 software can also be obtained from net-dist.mit.edu in the pub/PGP/README file. PGP 2.6.2 and RSAREF may be subject to the export control laws of the United States of America as implemented by the United States Department of State Office of Defense Trade Controls. The PGP signature information will be attached to the end of ASSIST bulletins. Reference herein to any specific commercial product, process, or service by trade name, trademark manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favoring by ASSIST. 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If you are not part of the DOD community, please contact your agency's incident response team to report incidents. Your agency's team will coordinate with DOD. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained by sending email to docserver@first.org with an empty subject line and a message body containing the line: send first-contacts. This document was prepared as an service to the DOD community. Neither the United States Government nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government. The opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government, and shall not be used for advertising or product endorsement purposes.