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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.205 -- SGI Security Advisory /dev/ipfilter Denial of Service vulnerability 1 May 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ipfilter Vendor: SGI Operating System: IRIX 6.5.10 and prior Impact: Denial of Service Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- _____________________________________________________________________________ SGI Security Advisory Title: /dev/ipfilter Denial of Service vulnerability Number: 20020408-01-I Date: April 30, 2002 Reference: CAN-2002-0172 ______________________________________________________________________________ - - ----------------------- - - --- Issue Specifics --- - - ----------------------- SGI has determined that the default permissions on /dev/ipfilter as created by /dev/MAKEDEV could lead to a Denial of Service attack. The default permissions were 644, and while the permissions are set to that value it is possible for a non-root user to disrupt network traffic. 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. - - -------------- - - --- Impact --- - - -------------- The /dev/ipfilter device is created by default on IRIX 6.5 systems during installation. The ipfilterd software that is intended to use this device is not installed by default, it is part of the eoe.sw.ipgate package. To determine if you are vulnerable, execute the following command: $ ls -l /dev/ipfilter crw-r--r-- 1 root sys 59, 0 Apr 12 08:33 /dev/ipfilter If your /dev/ipfilter shows the permissions and ownership of 644 as in the example above, then you are vulnerable. These vulnerabilities may not be exploited by a remote user, a local account is required. This issue has been corrected in IRIX 6.5.11 and later versions. This vulnerability was assigned the following CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0172 - - ---------------------------- - - --- Temporary Workaround --- - - ---------------------------- You can fix the permissions of /dev/ipfilter with the following command: # chmod 600 /dev/ipfilter After running that command, it should look like this: # ls -l /dev/ipfilter crw------- 1 root sys 59, 0 Apr 12 08:33 /dev/ipfilter However, SGI recommends upgrading to IRIX 6.5.11 or later because if the /dev/MAKEDEV script is run it will reset the permissions to 644. The /dev/MAKEDEV script has been changed in IRIX 6.5.11 to create the device with 600 permissions. - - ---------------- - - --- Solution --- - - ---------------- SGI has not provided patches for this vulnerability. Our recommendation is to upgrade to IRIX 6.5.11 or later. 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 IRIX 6.5.16 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 later. - - ------------- - - --- 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> end ^d In the example above, <YourEmailAddress> 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 iQCVAwUBPM3EQbQ4cFApAP75AQHU7wQAnyGpJCsHgdQk6hMCz0aY4o3Jw9ZQO2S6 uft8jJ/Orn5czOywZWI+oleP1t6yI4+dJ2CDdmrf5mhGiunMCU3lnJiQYgKJV6DE BM2NyavgdepmG4QgCInI6c6eJqKR7WAwxlHRI+CFD9cuf+frzmqsOgSmvqZaSAy5 X0fESvJzAUI= =BFoz - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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