From agent99@rock.csd.sgi.com Wed Nov 19 00:12:36 1997 Date: Tue, 18 Nov 1997 15:26:48 -0800 From: SGI Security Coordinator To: agent99@sgi.com Subject: Silicon Graphics Security Advisory 19971102-01-PX - Vulnerability in at(1) program DISTRIBUTION RESTRICTIONS - NONE - FOR PUBLIC RELEASE -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: Vulnerability in at(1) program Title: CERT CA-97.18 Number: 19971102-01-PX Date: November 18, 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 at(1) program is used by local users to read commands from standard input to be executed at a later time. These commands are run as the user using the at(1) program. In normal operation, the at(1) program runs as a setuid root privileged program inorder to perform its tasks. Unfortunately, a buffer overrun has been discovered in the at(1) program which could allow arbitrary commands to be run as the privileged user root. 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 at(1) program is installed on all Silicon Graphics IRIX systems by default. A local account is required in order to exploit this vulnerability both locally and remotely. This vulnerability can be utilized to execute commands with root privileges. This vulnerability has been publically discussed in Usenet newsgroups and mailing lists and also reported in CERT Advisory CA-97.18. - -------------------------- - --- 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 removing the permissions of the at(1) program. 1) Become the root user on the system. % /bin/su - Password: # 2) Remove the permissions on the at(1) program. # /bin/chmod 0 /usr/bin/at ************ *** NOTE *** ************ Removing the permissions from the at(1) program will prevent the program from executing, even for root user. 3) 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 2225 IRIX 6.0.x yes not avail Note 1 IRIX 6.1 yes not avail Note 1 IRIX 6.2 yes 2230 IRIX 6.3 yes 2232 IRIX 6.4 yes 2233 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.2225 Algorithm #1 (sum -r): 17470 8 README.patch.2225 Algorithm #2 (sum): 32106 8 README.patch.2225 MD5 checksum: 42A1501001E07C40544C93859E7C6E1B Filename: patchSG0002225 Algorithm #1 (sum -r): 12944 1 patchSG0002225 Algorithm #2 (sum): 30466 1 patchSG0002225 MD5 checksum: C8158D7B6552684FB4B89949627F6CFC Filename: patchSG0002225.eoe1_sw Algorithm #1 (sum -r): 58136 49 patchSG0002225.eoe1_sw Algorithm #2 (sum): 9067 49 patchSG0002225.eoe1_sw MD5 checksum: A97C10C3461E249585895CA72652A2E3 Filename: patchSG0002225.idb Algorithm #1 (sum -r): 15748 1 patchSG0002225.idb Algorithm #2 (sum): 34188 1 patchSG0002225.idb MD5 checksum: 0B7C6DC178A5C327E53F875A113E1971 Filename: README.patch.2230 Algorithm #1 (sum -r): 58607 17 README.patch.2230 Algorithm #2 (sum): 35215 17 README.patch.2230 MD5 checksum: 4340DCE3BA3469941F1361BB6208EDB1 Filename: patchSG0002230 Algorithm #1 (sum -r): 46535 2 patchSG0002230 Algorithm #2 (sum): 5679 2 patchSG0002230 MD5 checksum: 945EC35A9340CF2A74721701589AE3EC Filename: patchSG0002230.eoe_man Algorithm #1 (sum -r): 34340 606 patchSG0002230.eoe_man Algorithm #2 (sum): 28556 606 patchSG0002230.eoe_man MD5 checksum: 83D6EF44CAE016B7C509A63A450E2EEA Filename: patchSG0002230.eoe_sw Algorithm #1 (sum -r): 21159 1954 patchSG0002230.eoe_sw Algorithm #2 (sum): 52976 1954 patchSG0002230.eoe_sw MD5 checksum: E3CA682069D56992A92FC0B1385C8C6F Filename: patchSG0002230.idb Algorithm #1 (sum -r): 27782 15 patchSG0002230.idb Algorithm #2 (sum): 1450 15 patchSG0002230.idb MD5 checksum: 42654CBFA3AD648A9DBBDAA5C3115E31 Filename: README.patch.2232 Algorithm #1 (sum -r): 30727 12 README.patch.2232 Algorithm #2 (sum): 55743 12 README.patch.2232 MD5 checksum: DD9402D2434B1513A3B9886D70CD9243 Filename: patchSG0002232 Algorithm #1 (sum -r): 55916 3 patchSG0002232 Algorithm #2 (sum): 20486 3 patchSG0002232 MD5 checksum: FE63680542E429EA91D33AA15EB06537 Filename: patchSG0002232.eoe_man Algorithm #1 (sum -r): 43804 36 patchSG0002232.eoe_man Algorithm #2 (sum): 27383 36 patchSG0002232.eoe_man MD5 checksum: 6EE21B2D5362295BDC20D5F84BA7DEC4 Filename: patchSG0002232.eoe_sw Algorithm #1 (sum -r): 03690 421 patchSG0002232.eoe_sw Algorithm #2 (sum): 11833 421 patchSG0002232.eoe_sw MD5 checksum: C5AD8C10999347F8FA67871B5B98CB63 Filename: patchSG0002232.idb Algorithm #1 (sum -r): 38374 4 patchSG0002232.idb Algorithm #2 (sum): 4337 4 patchSG0002232.idb MD5 checksum: 0610B31450652A09F343E2B1ED3E939A Filename: README.patch.2233 Algorithm #1 (sum -r): 51881 11 README.patch.2233 Algorithm #2 (sum): 41695 11 README.patch.2233 MD5 checksum: 5D7F90A9AE9F2A483059E6D8D08DF317 Filename: patch2233.pgp.and.chksums Algorithm #1 (sum -r): 00000 0 patch2233.pgp.and.chksums Algorithm #2 (sum): 0 0 patch2233.pgp.and.chksums MD5 checksum: D41D8CD98F00B204E9800998ECF8427E Filename: patchSG0002233 Algorithm #1 (sum -r): 18405 3 patchSG0002233 Algorithm #2 (sum): 23610 3 patchSG0002233 MD5 checksum: 462695A8E5958C4B6A78960F001A2351 Filename: patchSG0002233.eoe_man Algorithm #1 (sum -r): 43804 36 patchSG0002233.eoe_man Algorithm #2 (sum): 27383 36 patchSG0002233.eoe_man MD5 checksum: 6EE21B2D5362295BDC20D5F84BA7DEC4 Filename: patchSG0002233.eoe_sw Algorithm #1 (sum -r): 24542 347 patchSG0002233.eoe_sw Algorithm #2 (sum): 6782 347 patchSG0002233.eoe_sw MD5 checksum: B5D1408146E7B71B1F5A8290ABCF5A4F Filename: patchSG0002233.idb Algorithm #1 (sum -r): 50085 3 patchSG0002233.idb Algorithm #2 (sum): 41850 3 patchSG0002233.idb MD5 checksum: B41E8A31941E47BD46682CFB4641882F - ------------------------ - --- Acknowledgments --- - ------------------------ Silicon Graphics wishes to thank the CERT Coordination Center for their assistance in this matter. - ----------------------------------------------------------- - --- 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. 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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 iQCVAwUBNHIcVLQ4cFApAP75AQEyzQP8C7SIc1UjQBOHqK8/uOFOXGx92Se9NCbK EUo81ZRHVfNY+WZ56FrC3YILjpTrXxnGMktbDAzb0mvFr6CIvu5MOgGCclOJb4jm oupXB2jCSk8MBe79Fj+Ap9KxzntfKOnNP/dJMe8HEOCx3RuLJrNoMpN0kQhG0P7F XLIQGZb65ew= =DXZr -----END PGP SIGNATURE-----