-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =============================================================================== >> CERT-NL, 01-Mar-2000 << >> All CERT-NL information has been moved to http://cert.surfnet.nl. Links << >> to CERT-NL information contained in this advisory are therefore outdated. << >> << >> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the << >> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the << >> complete CERT-CC advisory texts: http://www.cert.org << =============================================================================== =============================================================================== Security Advisory CERT-NL =============================================================================== Author/Source : Gert Meijerink Index : S-98-63 Distribution : World Page : 1 Classification: External Version: 1 Subject : SGI:IRIX at(1) Security Vulnerability Date : 7-Oct-98 =============================================================================== By courtesy of Silicon Graphics Inc. we received information on a vulnerability in the IRIX at(1)program in various versions of IRIX CERT-NL recommends to follow the suggestions in this Advisory. ============================================================================== - -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: IRIX at(1) vulnerability Title: NetBSD Security Advisory 1998-004 Number: 19981001-01-PX Date: October 5, 1998 _____________________________________________________________________________ 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 to execute commands at a later time. Unfortunately, a vulnerability has been discovered in the at(1) program that allows any file on the system to be read. 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 vulnerable SGI systems. This issue will be corrected in future releases of IRIX. - - --------------- - - ---- Impact --- - - --------------- The at(1) program is installed by default on all IRIX systems. Only IRIX 6.2, 6.4, 6.5 and 6.5.1 are vulnerable. A local account is required in order to exploit the at(1) vulnerability locally and remotely. The vulnerability allows a local user to read any file on the system. This vulnerability was reported by NetBSD Security Advisory 1998-004. This vulnerability has been publically discussed in Usenet newsgroups and mailing lists. - - --------------------------- - - ---- 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 minimize the vulnerability by restricting access to the vulnerable program. 1) Become the root user on the system. % /bin/su - Password: # 2) Change the permissions on the vulnerable program. # /bin/chmod 500 /usr/bin/at ************ *** NOTE *** ************ Removing group and other permissions from the vulnerable program will prevent non-root users from accessing the at(1) program. 3) Verify the new permissions on the program. Note that the program size may be different depending on release. # ls -al /usr/bin/at -r-x------ 1 root sys 37896 Feb 20 16:53 at 4) Return to the previous user level. # exit % - - ----------------- - - ---- Solution --- - - ----------------- OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x no IRIX 4.x no IRIX 5.0.x no IRIX 5.1.x no IRIX 5.2 no IRIX 5.3 no IRIX 6.0.x no IRIX 6.1 no IRIX 6.2 yes 3182 IRIX 6.3 no IRIX 6.4 yes 3184 IRIX 6.5 yes 3286 IRIX 6.5.1 yes 3286 Note 1 NOTES 1) If you have not received an IRIX 6.5.1m CD for IRIX 6.5, contact your SGI Support Provider or download the IRIX 6.5.1 Maintenance Release Stream from http://support.sgi.com/ Patches are available via anonymous FTP and your service/support provider. The primary SGI anonymous FTP site for security information and patches is sgigate.sgi.com (204.94.209.1). Security information and patches can be found in the ~ftp/security and ~ftp/patches directories, respectively. For security and patch management reasons, ftp.sgi.com (mirror of sgigate) lags behind and does not do a real-time update of ~ftp/security and ~ftp/patches. ##### Patch File Checksums #### The actual patch will be a tar file containing the following files: Filename: README.patch.3182 Algorithm #1 (sum -r): 30850 16 README.patch.3182 Algorithm #2 (sum): 15553 16 README.patch.3182 MD5 checksum: 3B34D52857D8A561AA21BE5819112251 Filename: patchSG0003182 Algorithm #1 (sum -r): 29381 10 patchSG0003182 Algorithm #2 (sum): 25835 10 patchSG0003182 MD5 checksum: 014FB79336A21F776D4616A40D5ED66A Filename: patchSG0003182.dev_sw Algorithm #1 (sum -r): 29421 167 patchSG0003182.dev_sw Algorithm #2 (sum): 60245 167 patchSG0003182.dev_sw MD5 checksum: F12045EED76A42D9E534473DE145F300 Filename: patchSG0003182.eoe_man Algorithm #1 (sum -r): 49928 732 patchSG0003182.eoe_man Algorithm #2 (sum): 2181 732 patchSG0003182.eoe_man MD5 checksum: 29BDDCEBB3F538BD1417656D68B1C205 Filename: patchSG0003182.eoe_sw Algorithm #1 (sum -r): 50376 4005 patchSG0003182.eoe_sw Algorithm #2 (sum): 8225 4005 patchSG0003182.eoe_sw MD5 checksum: 172E2B997C5383F5D8935CC8A3BDF3E0 Filename: patchSG0003182.idb Algorithm #1 (sum -r): 51467 32 patchSG0003182.idb Algorithm #2 (sum): 38073 32 patchSG0003182.idb MD5 checksum: F6189FD617CEDA6825B1B5DF86445CC6 Filename: README.patch.3184 Algorithm #1 (sum -r): 20261 14 README.patch.3184 Algorithm #2 (sum): 29975 14 README.patch.3184 MD5 checksum: 125A7A950DFC9097C6C09D1968E136E4 Filename: patchSG0003184 Algorithm #1 (sum -r): 37152 8 patchSG0003184 Algorithm #2 (sum): 57889 8 patchSG0003184 MD5 checksum: BA06CC50BE4F60977973DB78881CB2A7 Filename: patchSG0003184.eoe_man Algorithm #1 (sum -r): 36008 213 patchSG0003184.eoe_man Algorithm #2 (sum): 56912 213 patchSG0003184.eoe_man MD5 checksum: 0B0A1B17A8072222CC98894E2B8B7367 Filename: patchSG0003184.eoe_sw Algorithm #1 (sum -r): 32191 1341 patchSG0003184.eoe_sw Algorithm #2 (sum): 60291 1341 patchSG0003184.eoe_sw MD5 checksum: CF1146018BD54154AE99CECE36CCF526 Filename: patchSG0003184.idb Algorithm #1 (sum -r): 05813 14 patchSG0003184.idb Algorithm #2 (sum): 42422 14 patchSG0003184.idb MD5 checksum: 9F1D2A06C70BA5487D730E7DFBEB58B6 Filename: README.patch.3286 Algorithm #1 (sum -r): 55256 8 README.patch.3286 Algorithm #2 (sum): 29002 8 README.patch.3286 MD5 checksum: 73A6F76CD6D1AF8331A7B831C3D97BDB Filename: patchSG0003286 Algorithm #1 (sum -r): 61030 1 patchSG0003286 Algorithm #2 (sum): 34259 1 patchSG0003286 MD5 checksum: 3B58695C1E6B10C2D0C81FA6179B3BB0 Filename: patchSG0003286.eoe_sw Algorithm #1 (sum -r): 10812 61 patchSG0003286.eoe_sw Algorithm #2 (sum): 45331 61 patchSG0003286.eoe_sw MD5 checksum: 03773FA9D7AF436D7CC42044721E242C Filename: patchSG0003286.idb Algorithm #1 (sum -r): 08036 1 patchSG0003286.idb Algorithm #2 (sum): 33655 1 patchSG0003286.idb MD5 checksum: 6E038D350913318648C823ED84B523E6 - - ------------------------- - - ---- Acknowledgments --- - - ------------------------- Silicon Graphics wishes to thank the Internet community at large 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 iQCVAwUBNhk07rQ4cFApAP75AQGkEgP/WPUji1A2TBOF98ADOQUcqO6Sd2L2lQPo 8MOSpyBUXzfQ8hstwblLVMhCDbDrdweYyMJCwj1cILULcLnek/zikmP/tov8nFXx WB1DkYdvMTcP0Tf/4p7mDBDFm8H8BEK7IRGExQBsKIuIfTIJPcLWgREwWLWjRp34 tvUyTU0tyhY= =o/VI - -----END PGP SIGNATURE----- ============================================================================== CERT-NL wishes to thank Silicon Graphics Inc. , Inc for bringing this information to our attention ============================================================================== CERT-NL is the Computer Emergency Response Team for SURFnet customers. 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