__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SGI IRIX mail(1), rmail(1M), sendmail(1M) Vulnerabilities October 1, 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. Update includes version 8.8.8 of sendmail. 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. ______________________________________________________________________________ [ Update on October 1, 1998 with additional patch information ] [ 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: 19980604-02-PX Date: September 29, 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. ______________________________________________________________________________ - --------------- - ---- Update --- - --------------- As part of on going security efforts, Silicon Graphics has replaced patches: 2309 (IRIX 5.3), 2231 (IRIX 6.2) and 2310 (IRIX 6.3 & 6.4) with patches: 3347 (IRIX 5.3), 3348 (IRIX 6.2), 3394 (IRIX 6.3 & 6.4) and 3393 (IRIX 6.5 with IRIX 6.5.1 Maintenance Release). These new patches close a new Mail(1) security issue and fix some bugs in sendmail 8.8.8 anti-spam configuration. The original text from SGI Security Advisory 19980604-01-PX has been updated to reflect this change. - ------------------------ - ---- Issue Specifics --- - ------------------------ This advisory covers two security issues that were publicly 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 publicly 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 6) 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 3347 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 3348 IRIX 6.3 yes 3394 IRIX 6.4 yes 3394 IRIX 6.5 yes not avail Note 4 IRIX 6.5.1m yes 3393 Note 5 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/ 4) For IRIX 6.5, you must first install IRIX 6.5.1 Maintenance Release and then install patch 3393. If you have not received an IRIX 6.5.1m CD for IRIX 6.5, contact your SGI Support Provider or download the Maintenance Release from http://support.sgi.com/ 5) Patchsets have been replaced with quarterly Maintenance Releases Streams starting with IRIX 6.5. Information about Maintenance Release Streams can be found in the IRIX 6.5 Technical Brief at: http://www.sgi.com/software/irix6.5/ 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, respectively. ##### Patch File Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.3347 Algorithm #1 (sum -r): 61881 11 README.patch.3347 Algorithm #2 (sum): 20212 11 README.patch.3347 MD5 checksum: EC4353F140F0926BA1EAC5E8F6A47827 Filename: patchSG0003347 Algorithm #1 (sum -r): 61339 4 patchSG0003347 Algorithm #2 (sum): 55594 4 patchSG0003347 MD5 checksum: FD956A1D65BD01717D95AF59CFDE9F72 Filename: patchSG0003347.eoe1_man Algorithm #1 (sum -r): 11384 69 patchSG0003347.eoe1_man Algorithm #2 (sum): 23294 69 patchSG0003347.eoe1_man MD5 checksum: E3201B231A10E89FF1376D1BA9DFBB65 Filename: patchSG0003347.eoe1_sw Algorithm #1 (sum -r): 27750 850 patchSG0003347.eoe1_sw Algorithm #2 (sum): 3662 850 patchSG0003347.eoe1_sw MD5 checksum: DDE33397D29F3CC17593FB68C98093F0 Filename: patchSG0003347.idb Algorithm #1 (sum -r): 54110 7 patchSG0003347.idb Algorithm #2 (sum): 20457 7 patchSG0003347.idb MD5 checksum: 7F63FB32C0D3392909556D833ACF00A2 Filename: README.patch.3348 Algorithm #1 (sum -r): 02655 10 README.patch.3348 Algorithm #2 (sum): 52305 10 README.patch.3348 MD5 checksum: 6579FF9DBF69D8449FA41E62FA002D14 Filename: patchSG0003348 Algorithm #1 (sum -r): 25807 4 patchSG0003348 Algorithm #2 (sum): 47261 4 patchSG0003348 MD5 checksum: 12EED5A4099C1E63AFBE1C439339C71F Filename: patchSG0003348.eoe_man Algorithm #1 (sum -r): 01364 69 patchSG0003348.eoe_man Algorithm #2 (sum): 23234 69 patchSG0003348.eoe_man MD5 checksum: AA90D2858E7D2BBD02A2FDE25685B1A2 Filename: patchSG0003348.eoe_sw Algorithm #1 (sum -r): 42080 910 patchSG0003348.eoe_sw Algorithm #2 (sum): 36251 910 patchSG0003348.eoe_sw MD5 checksum: DA8B126611F0D4C0B28E676919BB3D66 Filename: patchSG0003348.idb Algorithm #1 (sum -r): 43633 7 patchSG0003348.idb Algorithm #2 (sum): 20449 7 patchSG0003348.idb MD5 checksum: 8F447F20F2828C12EC6CBF7E53686EF7 Filename: README.patch.3393 Algorithm #1 (sum -r): 16419 8 README.patch.3393 Algorithm #2 (sum): 46041 8 README.patch.3393 MD5 checksum: CF5A08C1EACC7B8242E7BC05C914C6EC Filename: patchSG0003393 Algorithm #1 (sum -r): 29657 3 patchSG0003393 Algorithm #2 (sum): 15111 3 patchSG0003393 MD5 checksum: 4B3CAFD8ED102F154DECCCAADF4760E0 Filename: patchSG0003393.eoe_man Algorithm #1 (sum -r): 26033 69 patchSG0003393.eoe_man Algorithm #2 (sum): 23233 69 patchSG0003393.eoe_man MD5 checksum: F03552977EA408EACB85B0772F3D3EC2 Filename: patchSG0003393.eoe_sw Algorithm #1 (sum -r): 11507 1160 patchSG0003393.eoe_sw Algorithm #2 (sum): 54353 1160 patchSG0003393.eoe_sw MD5 checksum: 523494C66C94EA50E6C3D60E56B04E75 Filename: patchSG0003393.idb Algorithm #1 (sum -r): 01437 8 patchSG0003393.idb Algorithm #2 (sum): 38192 8 patchSG0003393.idb MD5 checksum: 2EA142047CCD22B7E536A6720B9136A2 Filename: README.patch.3394 Algorithm #1 (sum -r): 22031 10 README.patch.3394 Algorithm #2 (sum): 40712 10 README.patch.3394 MD5 checksum: 89B34B7222723BFCA4220C18C2CA40E0 Filename: patchSG0003394 Algorithm #1 (sum -r): 61693 3 patchSG0003394 Algorithm #2 (sum): 32311 3 patchSG0003394 MD5 checksum: 23748EB8970E3CD8295C54E9AA8961BA Filename: patchSG0003394.eoe_man Algorithm #1 (sum -r): 26033 69 patchSG0003394.eoe_man Algorithm #2 (sum): 23233 69 patchSG0003394.eoe_man MD5 checksum: F03552977EA408EACB85B0772F3D3EC2 Filename: patchSG0003394.eoe_sw Algorithm #1 (sum -r): 55501 1153 patchSG0003394.eoe_sw Algorithm #2 (sum): 4669 1153 patchSG0003394.eoe_sw MD5 checksum: 5698C5642874FED5E95D9B5989BBF0D1 Filename: patchSG0003394.idb Algorithm #1 (sum -r): 10153 8 patchSG0003394.idb Algorithm #2 (sum): 36831 8 patchSG0003394.idb MD5 checksum: B85E01E783292D03AEF7778F14B61E18 - ------------------------- - ---- 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 iQCVAwUBNhFpkrQ4cFApAP75AQH6EQP+IpCtIpKPBXRYeGwdY1XrtOoVzovnsOhj ovA6JE4Cw4LJCSSOoRqLlhDcVZ9tjEXXu58BGLqcgd2/gLnVJruQO45yQdiqwep8 30oV+WNQzIJ/R+19ebhxsqlkHDcTcZfBfcfZvGK2KfGvzb0ao7TNLhFtTAqQu6dP 5lrvXF4T0Zs= =8CHe -----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. 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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. 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