From agent99@sgi.com Thu May 9 03:31:17 2002 From: SGI Security Coordinator To: agent99@sgi.com Cc: BUGTRAQ@LISTS.SECURITYFOCUS.COM, vulnwatch@vulnwatch.org Date: Wed, 8 May 2002 15:02:43 -0700 (PDT) Subject: [VulnWatch] IRIX fsr_xfs vulnerability -----BEGIN PGP SIGNED MESSAGE----- _____________________________________________________________________________ SGI Security Advisory Title: fsr_xfs vulnerability Number: 20020504-01-I Date: May 8, 2002 Reference: CAN-2002-0356 _____________________________________________________________________________ - ----------------------- - --- Issue Specifics --- - ----------------------- It's been reported that there is a problem with the fsr_xfs (XFS filesystem reorganizer) program that can, under certain circumstances, be manipulated by someone with malicious intent into causing critical system files to be overwritten. This could potentially lead to a root exploit. SGI has investigated the issues and recommends the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be implemented on ALL vulnerable SGI systems. - -------------- - --- Impact --- - -------------- 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 6.5.15f The first number ("6.5") is the release name, the second ("6.5.15f" in this case) is the extended release name. The extended release name is the "version" we refer to throughout this document. The fsr_xfs binary is installed by default on IRIX 6.5 systems as part of eoe.sw.base. These vulnerabilities may not be exploited by a remote user, a local account is required. This vulnerability can lead to a root exploit. This vulnerability has been fixed in IRIX 6.5.11 and later versions of IRIX. This vulnerability was assigned the following CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0356 - ---------------------------- - --- Temporary Workaround --- - ---------------------------- As a temporary workaround until you can upgrade the operating system to 6.5.11 or later, you can change root's crontab to run fsr_xfs with the -f option and point at a directory that normal users can't write to, such as /var/adm. To set up this workaround, follow these steps: 1) Become the superuser $ su - 2) Use vi or your favorite text editor to edit the file /var/spool/cron/crontabs/root # vi /var/spool/cron/crontabs/root 3) Look for a line that looks like this: 0 3 * * 0 if test -x /usr/etc/fsr; then (cd /usr/tmp; /usr/etc/fsr) fi 4) Change it to this: 0 3 * * 0 if test -x /usr/etc/fsr; then (cd /usr/tmp; /usr/etc/fsr -f /var/adm/.fsrlast) fi 5) Save the file and exit from the editor. crond will automatically detect the changes to the file, so it is not necessary to stop and restart crond. However, SGI recommends upgrading to at least IRIX 6.5.11, with later versions being preferred. - ---------------- - --- Solution --- - ---------------- SGI has not provided patches for this vulnerability. Our recommendation is to upgrade to IRIX 6.5.11 or a later version of IRIX. 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 no IRIX 6.5.12 no IRIX 6.5.13 no IRIX 6.5.14 no IRIX 6.5.15 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/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 6.5.11 or a later version of IRIX. - ------------------------ - --- Acknowledgments ---- - ------------------------ SGI wishes to thank John Vanderpool, 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 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 iQCVAwUBPNmfWLQ4cFApAP75AQG5IwP8CjXgJLzRM5yt7aSPCJrkIuxcd/8FQjUc isoD/54F8D8ovqJW9n2jwCcBl6xqqFP/WWlWt6knXzn80wzUXbELqwMLatgGpTsu pm2JLNvd5nQgvumHNyNRqVZQ/u/KQuvBOFnm1nf6oAGs/oJ/k3ahW23xiGfwYIG3 j0aDRSJaDu0= =2Hhn -----END PGP SIGNATURE-----