From agent99@sgi.com Tue Aug 13 22:57:54 2002 From: SGI Security Coordinator To: agent99@sgi.com Cc: vulnwatch@vulnwatch.org, bugtraq@securityfocus.com, full-disclosure@lists.netsys.com Date: Tue, 13 Aug 2002 16:12:19 -0700 (PDT) Reply-To: full-disclosure@lists.netsys.com Subject: [Full-Disclosure] IRIX ftpd minor vulnerabilities [The following text is in the "iso-8859-1" character set] [Your display is set for the "US-ASCII" character set] [Some characters may be displayed incorrectly] -----BEGIN PGP SIGNED MESSAGE----- _____________________________________________________________________________ SGI Security Advisory Title: ftpd minor vulnerabilities Number: 20020305-03-I Date: August 13, 2002 Reference: CERTŪ Vulnerability Note VU# 2558 Reference: CERTŪ CA-1997-27 Reference: SGI Security Advisory 20020305-02-I Reference: CVE-1999-0351 Reference: CVE-1999-0017 _____________________________________________________________________________ - ----------------------- - --- Issue Specifics --- - ----------------------- It has been reported that there are fundamental design issues in the FTP protocol which exhibit themselves as vulnerabilities in the ftpd daemon. 1) the "Pizza Thief" exploit, a minor security issue involving FTP connections when the PASV mode is being used. See the following URLs for additional details: http://www.kb.cert.org/vuls/id/2558 http://www.infowar.com/iwftp/iw_sec/iw_sec_01.txt 2) the "FTP_PrivilegedPort" exploit, a minor security issue involving FTP connections when the PORT mode is being used. See the following URLs for additional details: http://www.kbeta.com/attacklist/FTP_PrivilegedPort.htm http://www.cert.org/advisories/CA-1997-27.html ftp://patches.sgi.com/support/free/security/advisories/20020305-02-I 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 in future releases of IRIX. - -------------- - --- Impact --- - -------------- The binary /usr/etc/ftpd daemon is installed by default on IRIX 6.5 systems as part of eoe.sw.base. To determine the version of IRIX you are running, execute the following command: # uname -R That will return a result similar to the following: # 6.5 6.5.16f 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. A local account is required to exploit the FTP_PrivilegedPort exploit, but not the the Pizza Thief exploit. The "Pizza Thief" exploit was assigned the following CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0351 The FTP Privileged Port exploit was assigned the following CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0017 - ---------------------------- - --- Temporary Workaround --- - ---------------------------- SGI understands that there are times when upgrading the operating system or installing patches are inconvenient or not possible. In those instances, we recommend disabling ftpd as a workaround until the operating system can be upgraded. Follow these steps to disable ftpd: 1) become superuser % su - 2) edit the /etc/inetd.conf file # vi /etc/inetd.conf 3) find the line in inetd.conf that looks like this: ftp stream tcp nowait root /usr/etc/ftpd ftpd -l 4) comment the line out so it looks like the following line: #ftp stream tcp nowait root /usr/etc/ftpd ftpd -l ...then save the file and exit from the editor. 5) send a hangup signal to the inetd daemon to get it to reread the configuration file and implement the changes: # killall -HUP inetd 6) kill any running ftpd processes: # killall ftpd It is not necessary to reboot the system after performing this procedure. Note that ftp server services will no longer be available from the system after performing these steps. Normal ftp client services will still be available. - ---------------- - --- Solution --- - ---------------- SGI has not provided patches for these minor vulnerabilities. Our recommendation is to upgrade to IRIX 6.5.17 when available. 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 Notes 2 & 3 IRIX 6.5.15 yes Notes 2 & 3 IRIX 6.5.16 yes Notes 2 & 3 IRIX 6.5.17 no Note 4 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) 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/ 3) Upgrade to IRIX 6.5.17 or use the supplied workaround. IRIX 6.5.17 maintenance release can be downloaded from: http://support.sgi.com/colls/patches/tools/relstream/index.html 4) ftpd must be run with the -p flag for this to take effect. - ------------------------ - --- Acknowledgments ---- - ------------------------ SGI wishes to thank FIRST 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/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. - ----------------------------------------- - --- 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 < YourEmailAddress such as aaanalyst@sgi.com > 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 iQCVAwUBPVmQrLQ4cFApAP75AQFPGAP/U8V0gmWMFuC9hJvi/0RXX84sISnDCYFx 1JR1JLvza7YO0juvgHrfBG/GRFhrX3ToqFRREXD3HzjmUQzXcPFjXzWjvUJM+xdP Ig7HO2VldFlCwqKHQxUaXplumyTPVUqkytVvGA78EZ9b9Ku/2KUe9YO5Oi1efDut hq0CpjchzSI= =LLo2 -----END PGP SIGNATURE-----