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SGI Security Advisory 19970508-02-PX,
From: aleph1 () DFW NET (Aleph One)
Date: Tue, 16 Sep 1997 11:26:00 -0500
DISTRIBUTION RESTRICTIONS - NONE - FOR PUBLIC RELEASE -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: IRIX LOCKOUT and login/scheme Buffer Overrun Title: AUSCERT AA-97.12 and CERT CA-97.15 Title: AUSCERT AA-97.22 and CERT CA-97.21 Number: 19970508-02-PX Date: September 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 --- - ----------------------- This advisory covers two security issues that were public reported as two different issues. Both these issues have been addressed together by Silicon Graphics. The first issue has to do with the LOCKOUT functionality of the login(1) program. When the LOCKOUT value is set to a value greater than zero, an account will be locked when that value of unsuccessful login attempts has been made by the same user. Due to an error in the login verification process when LOCKOUT is enabled, files may be created or corrupted. This resulting file manipulation is considered a security vulnerability. The second related issue has to do with the login(1) program itself. Actually, the /usr/bin/login file is a symbolic link to the /usr/lib/iaf/scheme that is used at the startup of all terminal sessions to identify users to each session. Since arguments can be given to this program as part of use, it has been determined that an appropriately crafted set of arguments could be input to the login/scheme 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 these issues and recommends the following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be implemented on ALL SGI systems. These issues will be corrected in future releases of IRIX. - -------------- - --- Impact --- - -------------- The scheme program and login symbolic link to the scheme program are installed by default on all IRIX systems. The LOCKOUT variable in the /etc/default/login is set to zero as default. For these vulnerabilities, a local account is not required. Furthermore, the vulnerabilities can be exploited remotely. A local account is required in order to exploit these vulnerabilities both locally and remotely. Utilizing the LOCKOUT vulnerability, random files can be created and corrupted. Both of these security issues have been publically disclosed and discussed in several public forums including the BUGTRAQ mailing list. Additionally, security advisories AUSCERT AA-97.12, CERT CA-97.15, AUSCERT AA-97.22 and CERT CA-97.21 have been publically released on the issues. - -------------------------- - --- 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. Although there are no SGI provided workarounds for the login/scheme issue, the steps below can be used to remove the LOCKOUT vulnerability by disabling the LOCKOUT functionality. 1) Become the root user on the system. % /bin/su - Password: # 2) Edit the file /etc/default/login and place a "#" as the first character of the LOCKOUT line to comment out and deactivate the service. # vi /etc/default/login {Find the following line} LOCKOUT=3 {The value can be any number greater than 0.} {Place a "#" as the first character of the LOCKOUT line} #LOCKOUT=3 {Save the file and exit} 4) Return to previous level. # exit $ - ---------------- - --- Solution --- - ---------------- Since two security issues are addressed with the following patches, the "Vulnerable?" column below means that either one or both of the vulnerabilities exist in that OS version. OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x no IRIX 4.x no 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 2216 IRIX 6.0.x yes not avail Note 1 IRIX 6.1 yes not avail Note 1 IRIX 6.2 yes 2181 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.2216 Algorithm #1 (sum -r): 13912 12 README.patch.2216 Algorithm #2 (sum): 20179 12 README.patch.2216 MD5 checksum: FA1A32EE675B3719020F845B4C0B8F45 Filename: patchSG0002216 Algorithm #1 (sum -r): 03669 3 patchSG0002216 Algorithm #2 (sum): 18776 3 patchSG0002216 MD5 checksum: 7DA08E2147BEB9E49229B015DCB61895 Filename: patchSG0002216.eoe1_man Algorithm #1 (sum -r): 31290 33 patchSG0002216.eoe1_man Algorithm #2 (sum): 62564 33 patchSG0002216.eoe1_man MD5 checksum: 8EEF9215B03E7DB99D8011D41B7D6E1B Filename: patchSG0002216.eoe1_sw Algorithm #1 (sum -r): 27451 73 patchSG0002216.eoe1_sw Algorithm #2 (sum): 3649 73 patchSG0002216.eoe1_sw MD5 checksum: 5C38961E861E986DE49EFF5C3BECD641 Filename: patchSG0002216.eoe2_sw Algorithm #1 (sum -r): 22903 46 patchSG0002216.eoe2_sw Algorithm #2 (sum): 55667 46 patchSG0002216.eoe2_sw MD5 checksum: BFCE3A01BB0181626E79E584EB19525B Filename: patchSG0002216.idb Algorithm #1 (sum -r): 12991 3 patchSG0002216.idb Algorithm #2 (sum): 18240 3 patchSG0002216.idb MD5 checksum: E384459949E4B24C34591C786367B050 Filename: README.patch.2181 Algorithm #1 (sum -r): 40529 10 README.patch.2181 Algorithm #2 (sum): 15557 10 README.patch.2181 MD5 checksum: 7FBE5B1971162512C1D409E6D4BB9C71 Filename: patchSG0002181 Algorithm #1 (sum -r): 40880 2 patchSG0002181 Algorithm #2 (sum): 60865 2 patchSG0002181 MD5 checksum: 1F5CAA24C48D48D586486009871F275E Filename: patchSG0002181.eoe_man Algorithm #1 (sum -r): 12558 35 patchSG0002181.eoe_man Algorithm #2 (sum): 44605 35 patchSG0002181.eoe_man MD5 checksum: F6A9E5B102B1911074D1B1A34E351A05 Filename: patchSG0002181.eoe_sw Algorithm #1 (sum -r): 24729 73 patchSG0002181.eoe_sw Algorithm #2 (sum): 474 73 patchSG0002181.eoe_sw MD5 checksum: B92BC59995D99EFB60160F208F9A71B9 Filename: patchSG0002181.idb Algorithm #1 (sum -r): 19924 2 patchSG0002181.idb Algorithm #2 (sum): 59251 2 patchSG0002181.idb MD5 checksum: 4EAE11E46FFAC4B09963C6BE466A7A72 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 Inc. wishes to thank AUSCERT and the CERT Coordination Center and the Internet community for their assistance in these issues. - ----------------------------------------------------------- - --- 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 <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------ 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 iQCVAwUBNB2t4rQ4cFApAP75AQG7xwP+Ker5kOe7s5piPvkB1PdTLm/Kjty+VeAB bAruxd+HrnV9wQRB4sxB1bkvEgHIK4dWxfTARrZDfY8QmoT20CIjODoxwv72Fg9B AVXPu0qLWRa655ggyb3APjpMVtw+jjGiGoEH6Iu5Mj1nf5eW6tyeTdmOkefuXEXf aCWGWdwKtec= =g1E0 -----END PGP SIGNATURE-----
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