From agent99@rock.csd.sgi.com Wed Nov 19 00:11:56 1997 Date: Tue, 18 Nov 1997 15:22:58 -0800 From: SGI Security Coordinator To: agent99@sgi.com Subject: SGI Security Advisory 19970505-02-PX - IRIX df Buffer Overrun Vulnerability DISTRIBUTION RESTRICTIONS - NONE - FOR PUBLIC RELEASE -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: IRIX df Buffer Overrun Vulnerability Title: AUSCERT Advisory AA-97.19 and CERT Advisory CA-97.21 Number: 19970505-02-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 df(1) program is used to provide information about disk space usage on a system. The df(1) program is setuid root and as part of normal usage accepts user arguments to operate. It has been determined that an appropriately crafted set of arguments could be input to the df(1) program allowing execution of arbitrary user commands with root privileges. This resulting buffer overflow condition is considered a security vulnerability. 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 df(1) program (/sbin/df) is installed on all IRIX systems by default. A local account is required in order to exploit this vulnerability. With a local account the vulnerability can be exploited both locally and remotely. This vulnerability can be utilized to execute commands with root privileges. This security issue has been publically disclosed and discussed in several public forums including the BUGTRAQ mailing list. Additionally, security advisories AUSCERT AA-97.19 and CERT CA-97.21 have been publically released on the issue. - -------------------------- - --- 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 df program. 1) Become the root user on the system. % /bin/su - Password: # 2) Change the permissions on the df program. # /bin/chmod 500 /sbin/df ************ *** NOTE *** ************ Removing the setuid root permissions from the df program will prevent non-root users and applications from using the df program. 3) Return to previous level. # exit $ - ---------------- - --- Solution --- - ---------------- OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x unknown not avail Note 1 IRIX 4.x unknown 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 2224 IRIX 6.0.x yes not avail Note 1 IRIX 6.1 yes not avail Note 1 IRIX 6.2 yes 2177 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.2177 Algorithm #1 (sum -r): 24281 8 README.patch.2177 Algorithm #2 (sum): 27018 8 README.patch.2177 MD5 checksum: 7A3DF720DD7D6B1316E9937050233280 Filename: patchSG0002177 Algorithm #1 (sum -r): 43678 1 patchSG0002177 Algorithm #2 (sum): 29631 1 patchSG0002177 MD5 checksum: F97FBC0C9E17C9BFFE4ECC03924D8250 Filename: patchSG0002177.eoe_sw Algorithm #1 (sum -r): 17436 115 patchSG0002177.eoe_sw Algorithm #2 (sum): 24229 115 patchSG0002177.eoe_sw MD5 checksum: F01742532D483B02920F2837DB992CCA Filename: patchSG0002177.idb Algorithm #1 (sum -r): 20506 2 patchSG0002177.idb Algorithm #2 (sum): 59240 2 patchSG0002177.idb MD5 checksum: E52E021C27786A8047B95E0477B3B946 Filename: README.patch.2224 Algorithm #1 (sum -r): 06375 23 README.patch.2224 Algorithm #2 (sum): 65399 23 README.patch.2224 MD5 checksum: A8965CB89FF91CCE1BEC0EA31F057F2B Filename: patchSG0002224 Algorithm #1 (sum -r): 32725 10 patchSG0002224 Algorithm #2 (sum): 11598 10 patchSG0002224 MD5 checksum: E40BC7206484A9CC583C67F8BEDCDB1A Filename: patchSG0002224.eoe1_sw Algorithm #1 (sum -r): 43776 2095 patchSG0002224.eoe1_sw Algorithm #2 (sum): 16531 2095 patchSG0002224.eoe1_sw MD5 checksum: B538973E5982C82B7450D02CCAC3F601 Filename: patchSG0002224.eoe2_sw Algorithm #1 (sum -r): 23026 643 patchSG0002224.eoe2_sw Algorithm #2 (sum): 24004 643 patchSG0002224.eoe2_sw MD5 checksum: 6FCDDD383A115B97F9A884474AEFD3BD Filename: patchSG0002224.idb Algorithm #1 (sum -r): 46992 18 patchSG0002224.idb Algorithm #2 (sum): 4590 18 patchSG0002224.idb MD5 checksum: 16F15C4EBB396F49B62361D030801058 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 worldwide Internet community and the AUSCERT and CERT Coordination Center organizations 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. 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 iQCVAwUBNHIfB7Q4cFApAP75AQG/1gP/UP5/e4H9kx1eqx+Pk3PGrhRITsVwVhaZ V3Faarq9+Vs0U0tz1zzUH3vDOk6eMMMnoDDjU60XOxfIyNA35QEq1Z3mknz7dPD2 ++irDfCmqO6JFN6aQETEv1FyEfKfHgy9Pd6LtLPtkHwmK6yRK5IHJG8rqz2pl9WM 6T2RauaqUJQ= =XJJ6 -----END PGP SIGNATURE-----