__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Center ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SGI File Globbing Vulnerability in ftpd [SGI Security Advisory 20010802-01-P] August 30, 2001 01:00 GMT Number L-135 ______________________________________________________________________________ PROBLEM: Filename expansion using glob() can result in a buffer overflow in the ftpd. PLATFORM: IRIX versions 6.5, 6.5.1 through 6.5.12. DAMAGE: This exploit can lead to remote intruders executing arbitrary code on an FTP server up to and including root compromise, depending on the permissions of the ftpd process. SOLUTION: Apply the patch provided below. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. The vulnerability can be exploited remotely ASSESSMENT: and has been discussed widely and in detail in public forums. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/l-135.shtml ______________________________________________________________________________ [***** Start SGI Security Advisory 20010802-01-P *****] ______________________________________________________________________________ SGI Security Advisory Title: File globbing vulnerability in ftpd Number: 20010802-01-P Reference: CERTŪ Advisory CA-2001-07 Reference: CVE CAN-2001-0247 Date: August, 28 2001 ______________________________________________________________________________ SGI provides this information freely to the SGI user community for its consideration, interpretation, implementation and use. SGI recommends that this information be acted upon as soon as possible. SGI 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 SGI 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 --- - ----------------------- NAI COVERT Labs reported a file globbing vulnerability in ftpd daemon which can lead to a root compromise. 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. This issue has been corrected in future releases of IRIX. - -------------- - --- Impact --- - -------------- The ftpd(1M) daemon is installed by default on IRIX. A local user account on the vulnerable system is not required in order to exploit ftpd daemon. The ftpd daemon can be exploited remotely over an untrusted network. The exploitable buffer overflow vulnerability can lead to a root compromise. NAI Covert Labs reported the ftp server vulnerability: http://www.pgp.com/research/covert/advisories/048.asp The ftpd vulnerability was also reported by CERTŪ Advisory CA-2001-07: http://www.cert.org/advisories/CA-2001-07.html This ftpd vulnerability was assigned the following CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0247 This ftpd vulnerability has 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 disable the ftpd(1M) daemon to prevent exploitation of this vulnerability until patches can be installed. ================= **** WARNING **** ================= These steps will disable the ftp server. 1) Become the root user on the system. % /bin/su - Password: # 2) Edit the file /etc/inetd.conf and place a "#" as the first character of the ftp line to comment out and deactivate the service. # vi /etc/inetd.conf {Find the following line} ftp stream tcp nowait root /usr/etc/ftpd ftpd -l {Place a "#" as the first character of the ftp line} #ftp stream tcp nowait root /usr/etc/ftpd ftpd -l {Save the file and exit} 3) Force inetd to re-read the configuration file. # /etc/killall -HUP inetd 4) Kill any existing ftpd process. # /etc/killall ftpd 5) Return to previous level. # exit % - ---------------- - --- Solution --- - ---------------- 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 4270 Note 2 & 3 IRIX 6.5.1 yes 4270 Note 2 & 3 IRIX 6.5.2 yes 4270 Note 2 & 3 IRIX 6.5.3 yes 4270 Note 2 & 3 IRIX 6.5.4 yes 4270 Note 2 & 3 IRIX 6.5.5 yes 4270 Note 2 & 3 IRIX 6.5.6 yes 4270 Note 2 & 3 IRIX 6.5.7 yes 4270 Note 2 & 3 IRIX 6.5.8 yes 4270 Note 2 & 3 IRIX 6.5.9 yes 4270 Note 2 & 3 IRIX 6.5.10 yes 4270 Note 2 & 3 IRIX 6.5.11 yes 4270 Note 2 & 3 IRIX 6.5.12 yes 4270 Note 2 & 3 IRIX 6.5.13 no Note 4 & 5 NOTES 1) This version of the IRIX operating has been retired. Upgrade to an actively supported IRIX operating system. See http://support.sgi.com/irix/news/index.html#policy for more information. 2) This version of the IRIX operating system is in maintenance mode. Upgrade to an actively supported IRIX operating system. See http://support.sgi.com/irix/news/index.html#policy for more information. 3) See "Temporary Solution" section. 4) Download the IRIX 6.5.13 Maintenance Release Stream from the URL: http://support.sgi.com/colls/patches/tools/relstream/index.html 5) 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/irix/swupdates/ Patches are available via the web, anonymous FTP and from your SGI service/support provider. 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/irix/ 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/linux/ or http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/ SGI patches for Windows NT or 2000 can be found at: http://support.sgi.com/nt/ IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at: http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/ IRIX 6.5 Maintenance Release Streams can be found at: http://support.sgi.com/colls/patches/tools/relstream/index.html IRIX 6.5 Software Update CDs can be obtained from: http://support.sgi.com/irix/swupdates/ 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. ##### Patch File Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.4270 Algorithm #1 (sum -r): 12497 8 README.patch.4270 Algorithm #2 (sum): 34418 8 README.patch.4270 MD5 checksum: EBF634B7F6C4B87F7E0178F26EAFEE5A Filename: patchSG0004270 Algorithm #1 (sum -r): 18303 4 patchSG0004270 Algorithm #2 (sum): 56841 4 patchSG0004270 MD5 checksum: 08A70D53F1FC81E4AB4B462394BF2CA1 Filename: patchSG0004270.eoe_sw Algorithm #1 (sum -r): 63206 117 patchSG0004270.eoe_sw Algorithm #2 (sum): 11262 117 patchSG0004270.eoe_sw MD5 checksum: 8F359DA297E29553FA0D281BA1FB1110 Filename: patchSG0004270.idb Algorithm #1 (sum -r): 59260 1 patchSG0004270.idb Algorithm #2 (sum): 33639 1 patchSG0004270.idb MD5 checksum: 6CBBF5B738604C469A017C881646071D - ------------------------ - --- Acknowledgments ---- - ------------------------ SGI wishes to thank the NAI COVERT Labs, CERT Coordination Center and the users of the Internet Community at large for their assistance in this matter. - ----------------------------------------- - --- 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 gerneral 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. [***** End SGI Security Advisory 20010802-01-P *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of SGI for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Center, 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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