__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SGI: Multiple Vulnerabilities in BSD LPR Subsystem [SGI Security Advisory 20030406-02-P] April 15, 2003 19:00 GMT Number N-076 [Revised 25 April 2003] ______________________________________________________________________________ PROBLEM: Several vulnerabilities in the IRIX bsdlpr printing subsystem have been identified. - lpd chkhost() routine is easily spoofed - lpd should execl() sendmail -t, not sendmail - Unstable behavior in lpd resulting from the patch4835 fixes - lprm buffer overrun PLATFORM: IRIX 6.5 through IRIX 6.5.19 DAMAGE: A local intruder could possibly gain unauthorized access to the lpd server and may be able to gain additional privileges. SOLUTION: Upgrade to IRIX 6.5.20 (when available). For IRIX 6.5.14 through 6.5.19, install patch 5048. ______________________________________________________________________________ VULNERABILITY The risk is LOW. A BSD LPR subsystem is not installed by ASSESSMENT: default on IRIX 6.5 systems. A locally exploitable buffer overflow in "lprm" may permit a local attacker to gain elevated privileges and execute arbitrary code on a vulnerable host. There are no known exploits at this time. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-076.shtml ORIGINAL BULLETIN: ftp://patches.sgi.com/support/free/security/advisories/ 20030406-02-P ______________________________________________________________________________ [***** Start SGI Security Advisory 20030406-02-P *****] -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SGI Security Advisory Title : Multiple Vulnerabilities in BSD LPR Subsystem Number : 20030406-02-P Date : April 25, 2003 Reference: CERT VU#39001 Reference: CERT VU#30308 Reference: CERT VU#293305 Reference: CVE CAN-2003-0144 Reference: SGI Security Advisory 20030406-01-P Reference: SGI BUGS 864917 865485 873984 874729 880124 883255 Fixed in : IRIX 6.5.20 or patch 5071 ______________________________________________________________________________ - -------------- - --- Update --- - -------------- This is an update to SGI Security Bulletin 20030406-01-P. The patch referenced in that bulletin (patch 5048) did not contain the fixes for SGI bug number 880124. SGI support has released a new patch (patch 5071) that does contain all the fixes. - ----------------------- - --- Issue Specifics --- - ----------------------- It's been reported that there are several vulnerabilities in the IRIX bsdlpr printing subsystem: o lpd chkhost() routine is easily spoofed See: http://www.kb.cert.org/vuls/id/30308 o lpd should execl() sendmail -t, not sendmail See: http://www.kb.cert.org/vuls/id/39001 o Unstable behavior in lpd resulting from the patch4835 fixes o lprm buffer overrun See: http://www.insecure.org/sploits/lprm.overflow.html http://www.kb.cert.org/vuls/id/293305 SGI 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. These issues have been corrected with patches and in future releases of IRIX. - -------------- - --- Impact --- - -------------- The bsdlpr subsystem is not installed by default on IRIX 6.5 systems. It is an optional product which can be installed as "print.sw.bsdlpr". To determine the version of IRIX you are running, execute the following command: # /bin/uname -R That will return a result similar to the following: # 6.5 6.5.19f The first number ("6.5") is the release name, the second ("6.5.16f" in this case) is the extended release name. The extended release name is the "version" we refer to throughout this document. To see if the bsdlpr subsystem is installed, execute the following command: $ versions print.sw.bsdlpr I = Installed, R = Removed Name Date Description I print 01/30/2003 Printing Tools, Release 1.16.5f I print.sw 01/30/2003 Printing Tools Software 1.16.5f I print.sw.bsdlpr 01/30/2003 Berkeley 'lpr' Printer Spooler If the output shown is similar to the above, then the subsystem is installed and the system may be vulnerable. - ---------------------------- - --- Temporary Workaround --- - ---------------------------- There is no effective workaround available for these problems if the bsdlpr capabilities are needed in your printing environment. SGI recommends either upgrading to IRIX 6.5.20 (when available), or installing the appropriate patch from the listing below. - ---------------- - --- Solution --- - ---------------- SGI has provided a series of patches for these vulnerabilities. Our recommendation is to upgrade to IRIX 6.5.20 when available, or install the appropriate patch. Security patches are available on both http://support.sgi.com/ and ftp://patches.sgi.com/support/free/security/patches/ OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x unknown Note 1 IRIX 4.x unknown Note 1 IRIX 5.x unknown Note 1 IRIX 6.0.x unknown Note 1 IRIX 6.1 unknown Note 1 IRIX 6.2 unknown Note 1 IRIX 6.3 unknown Note 1 IRIX 6.4 unknown Note 1 IRIX 6.5 yes Notes 2 & 3 IRIX 6.5.1 yes Notes 2 & 3 IRIX 6.5.2 yes Notes 2 & 3 IRIX 6.5.3 yes Notes 2 & 3 IRIX 6.5.4 yes Notes 2 & 3 IRIX 6.5.5 yes Notes 2 & 3 IRIX 6.5.6 yes Notes 2 & 3 IRIX 6.5.7 yes Notes 2 & 3 IRIX 6.5.8 yes Notes 2 & 3 IRIX 6.5.9 yes Notes 2 & 3 IRIX 6.5.10 yes Notes 2 & 3 IRIX 6.5.11 yes Notes 2 & 3 IRIX 6.5.12 yes Notes 2 & 3 IRIX 6.5.13 yes Notes 2 & 3 IRIX 6.5.14 yes 5071 Notes 2, 3, & 4 IRIX 6.5.15 yes 5071 Notes 2, 3, & 4 IRIX 6.5.16 yes 5071 Notes 2, 3, & 4 IRIX 6.5.17 yes 5071 Notes 2, 3, & 4 IRIX 6.5.18 yes 5071 Notes 2, 3, & 4 IRIX 6.5.19 yes 5071 Notes 2, 3, & 4 IRIX 6.5.20 no NOTES 1) This version of the IRIX operating has been retired. Upgrade to an actively supported IRIX operating system. See http://support.sgi.com/ for more information. 2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your SGI Support Provider or URL: http://support.sgi.com/ 3) Upgrade to IRIX 6.5.20 (when available) 4) Install the patch or upgrade to IRIX 6.5.20 (when available) Security patches are available on both http://support.sgi.com/ and ftp://patches.sgi.com/support/free/security/patches/ Note that the patch does include all the fixes that were originally in patch 4835 and 5048. ##### Patch File Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.5071 Algorithm #1 (sum -r): 21383 8 README.patch.5071 Algorithm #2 (sum): 57354 8 README.patch.5071 MD5 checksum: 9B471EF86C10DC32F837B1FDD044529A Filename: patchSG0005071 Algorithm #1 (sum -r): 22998 3 patchSG0005071 Algorithm #2 (sum): 42262 3 patchSG0005071 MD5 checksum: 63AC61757D175E073D95B27E2D5D2A44 Filename: patchSG0005071.idb Algorithm #1 (sum -r): 12029 3 patchSG0005071.idb Algorithm #2 (sum): 52574 3 patchSG0005071.idb MD5 checksum: 4001E601B65EFE361F5EE694023EFA5A Filename: patchSG0005071.print_sw Algorithm #1 (sum -r): 29965 266 patchSG0005071.print_sw Algorithm #2 (sum): 10328 266 patchSG0005071.print_sw MD5 checksum: F3740393AEAE2EB9C89CCBA326EC8373 - ------------------------ - --- Acknowledgments ---- - ------------------------ SGI wishes to thank the U.S. Air Force, NASA and the users of the Internet Community at large for their assistance in this matter. - ------------- - --- Links --- - ------------- SGI Security Advisories can be found at: http://www.sgi.com/support/security/ and ftp://patches.sgi.com/support/free/security/advisories/ SGI Security Patches can be found at: http://www.sgi.com/support/security/ and ftp://patches.sgi.com/support/free/security/patches/ SGI patches for IRIX can be found at the following patch servers: http://support.sgi.com/ and ftp://patches.sgi.com/ SGI freeware updates for IRIX can be found at: http://freeware.sgi.com/ SGI fixes for SGI open sourced code can be found on: http://oss.sgi.com/projects/ SGI patches and RPMs for Linux can be found at: http://support.sgi.com/ SGI patches for Windows NT or 2000 can be found at: http://support.sgi.com/ IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at: http://support.sgi.com/ and ftp://patches.sgi.com/support/patchset/ IRIX 6.5 Maintenance Release Streams can be found at: http://support.sgi.com/ IRIX 6.5 Software Update CDs can be obtained from: http://support.sgi.com/ The primary SGI anonymous FTP site for security advisories and patches is patches.sgi.com (216.32.174.211). Security advisories and patches are located under the URL ftp://patches.sgi.com/support/free/security/ For security and patch management reasons, ftp.sgi.com (mirrors patches.sgi.com security FTP repository) lags behind and does not do a real-time update. - ----------------------------------------- - --- SGI Security Information/Contacts --- - ----------------------------------------- If there are questions about this document, email can be sent to security-info@sgi.com. ------oOo------ SGI 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 advisories and patches is patches.sgi.com (216.32.174.211). Security advisories and patches are located under the URL ftp://patches.sgi.com/support/free/security/ The SGI Security Headquarters Web page is accessible at the URL: http://www.sgi.com/support/security/ For issues with the patches on the FTP sites, email can be sent to security-info@sgi.com. For assistance obtaining or working with security patches, please contact your SGI support provider. ------oOo------ SGI 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------ SGI provides a comprehensive customer World Wide Web site. This site is located at http://www.sgi.com/support/security/ . ------oOo------ If there are general security questions on SGI systems, email can be sent to security-info@sgi.com. 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, SGI is appropriately credited and the document retains and includes its valid PGP signature. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBPqlwkbQ4cFApAP75AQGkWAQAgh7Jw6prsrtxjXy7Wft7zDNoLpkWKj6S rYhtkk+bc0T2n6gj0qBYbvEi/LXQff/civlaaB9zgaETcARPB02Zq0eFd4SiJAEq mXHEyUwTxqyI+7JzVXrYBSIDpmSChFM2HPlDDkvelM98xh/Xdy48Rolq0XkOTYwG jS/UH1gQNc4= =Cssm -----END PGP SIGNATURE----- [***** End SGI Security Advisory 20030406-02-P *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of SGI 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 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org 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. 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