From agent99@boytoy.csd.sgi.com Mon Aug 18 19:33:46 1997 Date: Mon, 18 Aug 1997 15:17:52 -0700 From: SGI Security Coordinator To: agent99@boytoy.csd.sgi.com Subject: SGI Security Advisory 19970801-01-PX - IRIX ftpd Signal Handling Vulnerability DISTRIBUTION RESTRICTIONS - NONE - FOR PUBLIC RELEASE -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: IRIX ftpd Signal Handling Vulnerability Number: 19970801-01-PX Date: August 15, 1997 ______________________________________________________________________________ Silicon Graphics provides this information freely to the SGI user community for its consideration, interpretation, implementation and use. Silicon Graphics recommends that this information be acted upon as soon as possible. Silicon Graphics 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 Silicon Graphics 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 --- - ----------------------- The ftpd(1M) program is the Internet File Transfer Protocol server process that listens for incoming service requests. As part of normal operation of the ftpd program, various service signals are received and handled. Due to a race condition with this signal handling, a vulnerability can result that allows the manipulation of files with root privileges. Silicon Graphics Inc. has investigated the issue and recommends the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be implemented on ALL SGI systems. This issue will be corrected in future releases of IRIX. - -------------- - --- Impact --- - -------------- The ftpd program (/usr/etc/ftpd) is installed on all IRIX systems by default. For this particular vulnerability, a local account is not required. Furthermore, the vulnerability can be exploited remotely. Utilizing this vulnerability, files may be arbitrarily read and written with root privileges. This vulnerability has been reported in AUSCERT Advisory AA-97.03 and CERT Advisory CA-97.16. - -------------------------- - --- 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 remove the vulnerability by disabling the ftpd program. NOTE: When disabled, ftp oriented connections will not be possible in or out of the system. 1) Become the root user on the system. % /bin/su - Password: # 2) Edit the file /etc/inetd.conf (for IRIX 5.3 and lower, edit /usr/etc/inetd.conf). 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 ntalk 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) Return to previous level. # exit $ - ---------------- - --- Solution --- - ---------------- OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x yes not avail Note 1 IRIX 4.x yes not avail Note 1 IRIX 5.0.x yes not avail Note 1 IRIX 5.1.x yes not avail Note 1 IRIX 5.2 yes not avail Note 1 IRIX 5.3 yes 2292 IRIX 6.0.x yes not avail Note 1 IRIX 6.1 yes not avail Note 1 IRIX 6.2 yes 1485 IRIX 6.3 no IRIX 6.4 no NOTES 1) upgrade operating system or see "Temporary Solution" section. Patches are available via anonymous FTP and your service/support provider. The SGI anonymous FTP site is sgigate.sgi.com (204.94.209.1) or its mirror, ftp.sgi.com. Security information and patches can be found in the ~ftp/security and ~ftp/patches directories, respectfully. ##### Patch File Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.1485 Algorithm #1 (sum -r): 14910 14 README.patch.1485 Algorithm #2 (sum): 18189 14 README.patch.1485 MD5 checksum: ADB6A0762E278A45998D98CEF500F084 Filename: patchSG0001485 Algorithm #1 (sum -r): 12066 5 patchSG0001485 Algorithm #2 (sum): 43246 5 patchSG0001485 MD5 checksum: F9412E4C328CDCAD6DD58FFCDAA95FC5 Filename: patchSG0001485.eoe_man Algorithm #1 (sum -r): 36966 23 patchSG0001485.eoe_man Algorithm #2 (sum): 48592 23 patchSG0001485.eoe_man MD5 checksum: 79F0F83A0C96F20CB18D56E04548456B Filename: patchSG0001485.eoe_sw Algorithm #1 (sum -r): 28352 1073 patchSG0001485.eoe_sw Algorithm #2 (sum): 49664 1073 patchSG0001485.eoe_sw MD5 checksum: AB8A52D58219A05A5D4BC9B0775A1218 Filename: patchSG0001485.idb Algorithm #1 (sum -r): 35926 8 patchSG0001485.idb Algorithm #2 (sum): 45831 8 patchSG0001485.idb MD5 checksum: 60AF5CE37333674ED5806A4108E9E682 Filename: patchSG0001485.netman_data_man Algorithm #1 (sum -r): 56900 15 patchSG0001485.netman_data_man Algorithm #2 (sum): 58999 15 patchSG0001485.netman_data_man MD5 checksum: 42BEB35E700813967F637E9BB0640385 Filename: patchSG0001485.nfs_man Algorithm #1 (sum -r): 05186 17 patchSG0001485.nfs_man Algorithm #2 (sum): 21113 17 patchSG0001485.nfs_man MD5 checksum: F090E7476C01DC64F12F3A094EFAD64B Filename: patchSG0001485.nfs_sw Algorithm #1 (sum -r): 20081 73 patchSG0001485.nfs_sw Algorithm #2 (sum): 625 73 patchSG0001485.nfs_sw MD5 checksum: A770134D811CD1F9BEE62E86E9E7A121 Filename: README.patch.2292 Algorithm #1 (sum -r): 42992 50 README.patch.2292 Algorithm #2 (sum): 19871 50 README.patch.2292 MD5 checksum: 45C02D1F732F1306A8E01C9B41632081 Filename: patchSG0002292 Algorithm #1 (sum -r): 21569 28 patchSG0002292 Algorithm #2 (sum): 48653 28 patchSG0002292 MD5 checksum: 1118D1F3E3DE2F7BA6720E21F8E79288 Filename: patchSG0002292.dev_hdr Algorithm #1 (sum -r): 55046 18 patchSG0002292.dev_hdr Algorithm #2 (sum): 21666 18 patchSG0002292.dev_hdr MD5 checksum: 12D756C9AAADDA464F628FB08B8012C2 Filename: patchSG0002292.eoe1_man Algorithm #1 (sum -r): 58486 19 patchSG0002292.eoe1_man Algorithm #2 (sum): 19828 19 patchSG0002292.eoe1_man MD5 checksum: 971A700918352743FDFAD9DC7AAC7F08 Filename: patchSG0002292.eoe1_sw Algorithm #1 (sum -r): 44489 3870 patchSG0002292.eoe1_sw Algorithm #2 (sum): 46581 3870 patchSG0002292.eoe1_sw MD5 checksum: 3A1228F719826BE5FAC06BC2610D9FE0 Filename: patchSG0002292.eoe2_man Algorithm #1 (sum -r): 20509 16 patchSG0002292.eoe2_man Algorithm #2 (sum): 64242 16 patchSG0002292.eoe2_man MD5 checksum: B0491FEFB0CE1C0BC03F7A1345BDE250 Filename: patchSG0002292.eoe2_sw Algorithm #1 (sum -r): 04632 1401 patchSG0002292.eoe2_sw Algorithm #2 (sum): 22409 1401 patchSG0002292.eoe2_sw MD5 checksum: 668865304DC6C3669B6D3E84AF43821A Filename: patchSG0002292.idb Algorithm #1 (sum -r): 56516 52 patchSG0002292.idb Algorithm #2 (sum): 26358 52 patchSG0002292.idb MD5 checksum: EC5A3C0A1CE3953F71354CDFA1A6052A Filename: patchSG0002292.nfs_man Algorithm #1 (sum -r): 22345 17 patchSG0002292.nfs_man Algorithm #2 (sum): 21111 17 patchSG0002292.nfs_man MD5 checksum: 8782FA52CAB650472352DABC1C38B823 Filename: patchSG0002292.nfs_sw Algorithm #1 (sum -r): 19426 162 patchSG0002292.nfs_sw Algorithm #2 (sum): 7929 162 patchSG0002292.nfs_sw MD5 checksum: E298C481D601E57F24BCAF30173BB304 - ------------------------ - --- Acknowledgments --- - ------------------------ Silicon Graphics Inc. wishes to thank the CERT Coordination Center and AUSCERT for their assistance in this issue. - ----------------------------------------------------------- - --- Silicon Graphics Inc. Security Information/Contacts --- - ----------------------------------------------------------- If there are questions about this document, email can be sent to cse-security-alert@sgi.com. ------oOo------ Silicon Graphics 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 information and patches is sgigate.sgi.com (204.94.209.1). Security information and patches are located under the directories ~ftp/security and ~ftp/patches, respectively. The Silicon Graphics Security Headquarters Web page is accessible at the URL http://www.sgi.com/Support/security/security.html. For issues with the patches on the FTP sites, email can be sent to cse-security-alert@sgi.com. For assistance obtaining or working with security patches, please contact your SGI support provider. ------oOo------ Silicon Graphics 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------ Silicon Graphics provides a comprehensive customer World Wide Web site. This site is located at http://www.sgi.com/Support/security/security.html. ------oOo------ 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, Silicon Graphics is appropriately credited and the document retains and includes its valid PGP signature. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBM/i8PLQ4cFApAP75AQFNMwQAtZHV6kz0bwf8QzeTX4Cjn9QrjQN/S+A4 tlC3DmtPrs67D55krAvY7hLz3K2Qgl6mkE6TWC7VSWuVQoiviIguB26Kv+V3nRFo vyjyoQ3VTmGbSmZV3b6q+nFVSXE29hnbPGTflV9atnf7j+m4b7EeMTQUyHjk4/v4 wdA4ynfwTqY= =hbqC -----END PGP SIGNATURE-----