From ciac@tholia.llnl.gov Wed Jun 24 21:46:35 1998 From: CIAC Mail User To: ciac-bulletin@tholia.llnl.gov Date: Mon, 22 Jun 1998 07:46:30 -0700 (PDT) Subject: CIAC Bulletin I-064: SGI IRIX mail(1), rmail(1M), sendmail(1M) Vulnerabilities [ For Public Release ] -----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SGI IRIX mail(1), rmail(1M), sendmail(1M) Vulnerabilities June 19, 1998 20:00 GMT Number I-064 ______________________________________________________________________________ PROBLEM: Several security vulnerabilities have been identified in mail(1), rmail(1M), and sendmail(1M) PLATFORM: Any SGI IRIX system running mail(1), rmail(1M), the default version of sendmail 8.6.12. DAMAGE: The vulnerabilities in mail(1) and rmail(1M) may allow a local user access to any file that is owned by the mail group(4). By exploiting the vulnerabilities in sendmail(1M), an attacker may obtain root access. SOLUTION: Apply patches or workarounds. ______________________________________________________________________________ VULNERABILITY Silicon Graphics Inc. has investigated the issue and recommends ASSESSMENT: the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be implemented on ALL vulnerable SGI systems. ______________________________________________________________________________ [ Start Silicon Graphics Inc. Advisory ] - -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: IRIX mail(1)/rmail(1M)/sendmail(1M) Security Vulnerabilities Title: CERT CA-96.20 Number: 19980604-01-PX Date: June 18, 1998 ______________________________________________________________________________ Silicon Graphics provides this information freely to the SGI user community for its consideration, interpretation, implementation and use. Silicon Graphics recommends that this information be acted upon as soon as possible. Silicon Graphics provides the information in this Security Advisory on an "AS-IS" basis only, and disclaims all warranties with respect thereto, express, implied or otherwise, including, without limitation, any warranty of merchantability or fitness for a particular purpose. In no event shall Silicon Graphics be liable for any loss of profits, loss of business, loss of data or for any indirect, special, exemplary, incidental or consequential damages of any kind arising from your use of, failure to use or improper use of any of the instructions or information in this Security Advisory. ______________________________________________________________________________ - ------------------------- - ----- Issue Specifics --- - ------------------------- This advisory covers two security issues that were publically reported as two different issues. Both these issues have been addressed together as one issue by Silicon Graphics. The first security issue involves mail(1)/rmail(1M) programs. The mail(1) program, also know as mail_att, is used to read or send email. The rmail(1M) program is usually invoked by uux(1C) to receive email via UUCP(1C). Several security vulnerabilities were discovered in mail(1)/rmail(1M) that allow any local user with access to mail(1) and rmail(1M) programs to access or modify any file that is owned by the mail group(4). The second security issue involves sendmail(1M). The sendmail(1M) program is used to deliver and receive email. On a fully patched IRIX system, the default version of sendmail is 8.6.12. Several vulnerabilities have been found in sendmail 8.7.5 and lower which are referenced and documented in CERT CA-96.20 and can be found at: http://www.cert.org/advisories/CA-96.20.sendmail_vul.html Silicon Graphics Inc. has investigated the issue and recommends the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be implemented on ALL vulnerable SGI systems. This issue will be corrected in future releases of IRIX. - ---------------- - ----- Impact --- - ---------------- The mail(1)/rmail(1M)/sendmail(1M) programs are installed by default on IRIX. A user account on the vulnerable system is required in order to exploit mail(1)/rmail(1M) locally and remotely. A local user account is not needed to exploit the sendmail(1M) program locally and remotely. These vulnerabilities have been publically discussed in Usenet newsgroups and mailing lists. - ---------------------------- - ----- Temporary Solution --- - ---------------------------- Although patches are available for this issue, it is realized that there may be situations where installing the patches immediately may not be possible. The steps below can be used to remove the vulnerability by removing the setgid permissions of the mail(1)/rmail(1M) programs. There are no workarounds for sendmail 8.6.12 vulnerabilities. The sendmail(1M) program must be disabled or the patches need to be installed to upgrade it to sendmail 8.8.8. 1) Become the root user on the system. % /bin/su - Password: # 2) Remove the setgid permissions on the vulnerable programs. # /bin/chmod 555 /usr/bin/mail # /bin/chmod 555 /usr/bin/rmail 4) Verify the new permissions on the program. Note that the program size may be different depending on release. # ls -al /usr/bin/mail /usr/bin/rmail -r-xr-xr-x 1 root mail 53024 Feb 12 1996 mail -r-xr-xr-x 1 root mail 14216 May 16 1996 rmail 5) Disable the vulnerable sendmail(1M) program. # chkconfig sendmail off # /etc/init.d/mail stop 5) Return to previous user level. # exit % - ------------------ - ----- Solution --- - ------------------ These patches fix the rmail(1)/mail(1M) security vulnerabilities and upgrade sendmail(1M) to version 8.8.8. OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x yes not avail Note 1, 2 & 3 IRIX 4.x yes not avail Note 1, 2 & 3 IRIX 5.0.x yes not avail Note 1, 2 & 3 IRIX 5.1.x yes not avail Note 1, 2 & 3 IRIX 5.2 yes not avail Note 1, 2 & 3 IRIX 5.3 yes 2309 IRIX 6.0.x yes not avail Note 1, 2 & 3 IRIX 6.1 yes not avail Note 1, 2 & 3 IRIX 6.2 yes 2231 IRIX 6.3 yes 2310 IRIX 6.4 yes 2310 IRIX 6.5 no NOTES 1) Upgrade to currently supported IRIX operating system. 2) See "Temporary Solution" section for a workaround. 3) Unsupported by SGI, "freeware" sendmail distributions can be found at http://www.sendmail.org/ Patches are available via anonymous FTP and your service/support provider. The SGI anonymous FTP site is sgigate.sgi.com (204.94.209.1) or its mirror, ftp.sgi.com. Security information and patches can be found in the ~ftp/security and ~ftp/patches directories, respectfully. ##### Patch File Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.2231 Algorithm #1 (sum -r): 29635 8 README.patch.2231 Algorithm #2 (sum): 61238 8 README.patch.2231 MD5 checksum: 93F6B8811CE2576475316A2B4642FFA5 Filename: patchSG0002231 Algorithm #1 (sum -r): 52080 2 patchSG0002231 Algorithm #2 (sum): 7506 2 patchSG0002231 MD5 checksum: 513D5729D2356C79D5E397863803F5D5 Filename: patchSG0002231.eoe_man Algorithm #1 (sum -r): 31776 69 patchSG0002231.eoe_man Algorithm #2 (sum): 10533 69 patchSG0002231.eoe_man MD5 checksum: A6E76331FE9611319D137B260CF0D76E Filename: patchSG0002231.eoe_sw Algorithm #1 (sum -r): 13889 687 patchSG0002231.eoe_sw Algorithm #2 (sum): 24064 687 patchSG0002231.eoe_sw MD5 checksum: 8228192A12048ACD78AB8F262A006A33 Filename: patchSG0002231.idb Algorithm #1 (sum -r): 07552 6 patchSG0002231.idb Algorithm #2 (sum): 29565 6 patchSG0002231.idb MD5 checksum: 4B4CA561990D6CCE21C322650DB5E4D6 Filename: README.patch.2309 Algorithm #1 (sum -r): 32975 9 README.patch.2309 Algorithm #2 (sum): 60467 9 README.patch.2309 MD5 checksum: 5848AB770B8EA81FA196FFCC12082056 Filename: patchSG0002309 Algorithm #1 (sum -r): 56282 4 patchSG0002309 Algorithm #2 (sum): 42072 4 patchSG0002309 MD5 checksum: 14649EBE949F464B28E17FA03F001AC8 Filename: patchSG0002309.eoe1_man Algorithm #1 (sum -r): 57312 69 patchSG0002309.eoe1_man Algorithm #2 (sum): 39389 69 patchSG0002309.eoe1_man MD5 checksum: 7DA3680EC4CBB635265E349E9603C58B Filename: patchSG0002309.eoe1_sw Algorithm #1 (sum -r): 28257 688 patchSG0002309.eoe1_sw Algorithm #2 (sum): 30302 688 patchSG0002309.eoe1_sw MD5 checksum: 250B98DC7C4207094818C2C2F2C37254 Filename: patchSG0002309.idb Algorithm #1 (sum -r): 53181 6 patchSG0002309.idb Algorithm #2 (sum): 30341 6 patchSG0002309.idb MD5 checksum: 57CFB3DE7EACE6CEC75A8C1EECBE6E6D Filename: README.patch.2310 Algorithm #1 (sum -r): 30227 8 README.patch.2310 Algorithm #2 (sum): 53644 8 README.patch.2310 MD5 checksum: 109285169451B313A39E157801EF77A5 Filename: patchSG0002310 Algorithm #1 (sum -r): 52429 2 patchSG0002310 Algorithm #2 (sum): 57083 2 patchSG0002310 MD5 checksum: A7FD0C1AEDD8D2F75FE72232E71B6483 Filename: patchSG0002310.eoe_man Algorithm #1 (sum -r): 07011 69 patchSG0002310.eoe_man Algorithm #2 (sum): 10532 69 patchSG0002310.eoe_man MD5 checksum: F0003330AB4E323744B6015182E0F68A Filename: patchSG0002310.eoe_sw Algorithm #1 (sum -r): 64113 692 patchSG0002310.eoe_sw Algorithm #2 (sum): 13768 692 patchSG0002310.eoe_sw MD5 checksum: DA6870AD18DBC691424B5E52B32DF18B Filename: patchSG0002310.idb Algorithm #1 (sum -r): 07855 6 patchSG0002310.idb Algorithm #2 (sum): 28233 6 patchSG0002310.idb MD5 checksum: 6836E4720A7F7779681EB0486D8AAD5C - -------------------------- - ----- Acknowledgments --- - -------------------------- Silicon Graphics wishes to thank the CERT Coordination Center and the users of the Internet Community at large for their assistance in this matter. - ------------------------------------------------------------- - ----- Silicon Graphics Inc. Security Information/Contacts --- - ------------------------------------------------------------- If there are questions about this document, email can be sent to cse-security-alert@sgi.com. ------oOo------ Silicon Graphics provides security information and patches for use by the entire SGI community. This information is freely available to any person needing the information and is available via anonymous FTP and the Web. The primary SGI anonymous FTP site for security information and patches is sgigate.sgi.com (204.94.209.1). Security information and patches are located under the directories ~ftp/security and ~ftp/patches, respectively. The Silicon Graphics Security Headquarters Web page is accessible at the URL http://www.sgi.com/Support/security/security.html. For issues with the patches on the FTP sites, email can be sent to cse-security-alert@sgi.com. For assistance obtaining or working with security patches, please contact your SGI support provider. ------oOo------ Silicon Graphics provides a free security mailing list service called wiretap and encourages interested parties to self-subscribe to receive (via email) all SGI Security Advisories when they are released. Subscribing to the mailing list can be done via the Web (http://www.sgi.com/Support/security/wiretap.html) or by sending email to SGI as outlined below. % mail wiretap-request@sgi.com subscribe wiretap end ^d In the example above, is the email address that you wish the mailing list information sent to. The word end must be on a separate line to indicate the end of the body of the message. The control-d (^d) is used to indicate to the mail program that you are finished composing the mail message. ------oOo------ Silicon Graphics provides a comprehensive customer World Wide Web site. This site is located at http://www.sgi.com/Support/security/security.html. ------oOo------ For reporting *NEW* SGI security issues, email can be sent to security-alert@sgi.com or contact your SGI support provider. A support contract is not required for submitting a security report. ______________________________________________________________________________ This information is provided freely to all interested parties and may be redistributed provided that it is not altered in any way, Silicon Graphics is appropriately credited and the document retains and includes its valid PGP signature. - -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBNYmJybQ4cFApAP75AQFY4QP/SZhh4+kREQsLq5UomklA6JxTeGK4RNDC UJAN5p3kvDHZokC/aMKUPsweA5wry904tM0BefDmxtEqWClF8X5okGnAQrPNjxXv lwEKrx08lY1Wxi0zqq48YkR9Z4WXapRRlu3rzdOHxQ4yz8T7DmA9MBAmKaz7w4FG 9icf4mHTRyg= =79In - -----END PGP SIGNATURE----- [ End Silicon Graphics Inc. Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Silicon Graphics Inc. for the information contained in this bulletin. ______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@llnl.gov For emergencies and off-hour assistance, DOE, DOE contractor sites, and the NIH may contact CIAC 24-hours a day. During off hours (5PM - 8AM PST), call the CIAC voice number 925-422-8193 and leave a message, or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC duty person, and the secondary PIN number, 8550074 is for the CIAC Project Leader. Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ (or http://ciac.llnl.gov -- they're the same machine) Anonymous FTP: ftp.ciac.org (or ciac.llnl.gov -- they're the same machine) Modem access: +1 (925) 423-4753 (28.8K baud) +1 (925) 423-3331 (28.8K baud) CIAC has several self-subscribing mailing lists for electronic publications: 1. CIAC-BULLETIN for Advisories, highest priority - time critical information and Bulletins, important computer security information; 2. SPI-ANNOUNCE for official news about Security Profile Inspector (SPI) software updates, new features, distribution and availability; 3. SPI-NOTES, for discussion of problems and solutions regarding the use of SPI products. Our mailing lists are managed by a public domain software package called Majordomo, which ignores E-mail header subject lines. To subscribe (add yourself) to one of our mailing lists, send the following request as the E-mail message body, substituting ciac-bulletin, spi-announce OR spi-notes for list-name: E-mail to ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov: subscribe list-name e.g., subscribe ciac-bulletin You will receive an acknowledgment email immediately with a confirmation that you will need to mail back to the addresses above, as per the instructions in the email. This is a partial protection to make sure you are really the one who asked to be signed up for the list in question. If you include the word 'help' in the body of an email to the above address, it will also send back an information file on how to subscribe/unsubscribe, get past issues of CIAC bulletins via email, etc. PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. 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 via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, 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 or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) I-054: Cisco Web Cache Control Protocol Router Vulnerability I-055: SGI IRIX Vulnerabilities (NetWare Client, diskperf/diskalign I-056: Cisco PIX Private Link Key Processing and Cryptography Vulnerabilities I-057: FreeBSD NFS Kernel Code Error I-058: SunOS rpc.nisd Vulnerability I-059: SUN ftpd Vulnerability I-060: SGI IRIX OSF/DCE Denial of Service Vulnerability I-061: SGI IRIX mediad(1M) Vulnerability I-062: SGI IRIX BIND DNS named(1M) Vulnerability I-063: RSI BSDI rlogind Vulnerability -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBNYrrEbnzJzdsy3QZAQGFqQP8D66eemFd4A6UjuHjecx+Fw7ZolGZ+OaG nI9S85nDOnZWxWAF25VW4tuFhnbH6YKbi8J543Ny3iiPNbxkgGG9oTtPfhFTviUw 0lVXGbkPFXpIiGD3NEFLKWfBEfDPW4x22Db+fd0uxNODhfTyLltjpC+eMYpiyYkt UXOHKn26ze4= =nW1p -----END PGP SIGNATURE-----