-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: xterm(1) exploitable buffer overflow Title: CERT VB-98.04 Number: 19981002-01-PX Date: October 15, 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 Open Group (http://www.opengroup.org/) has reported via CERT that an exploitable buffer overflow has been discovered in xterm(1) which can lead to a root compromise. 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 xterm(1) program is installed by default on IRIX. A local user account on the vulnerable system is required in order to exploit xterm(1) program. The exploitable buffer overflow vulnerability can lead to a root compromise. This xterm buffer overflow vulnerability was reported by CERT VB-98.04: http://www.cert.org/ftp/cert_bulletins/VB-98.04.xterm.Xaw This xterm vulnerability has been publicly 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 remove the vulnerability by removing the setuid permissions of the xterm(1) program. 1) Become the root user on the system. % /bin/su - Password: # 2) Remove the setuid-root bit from the xterm binary. # chmod 0755 /usr/bin/X11/xterm 3) Verify the new permissions on the program. Note that the program size may be different depending on release. # ls -al /usr/bin/X11/xterm -rwxr-xr-x 1 root sys 204728 May 22 16:36 /usr/bin/X11/xterm 4) Return to previous level. # exit % - ---------------- - --- Solution --- - ---------------- OS Version Vulnerable? Patch # Other Actions ---------- ----------- ------- ------------- IRIX 3.x yes Note 1 & 2 IRIX 4.x yes Note 1 & 2 IRIX 5.0.x yes Note 1 & 2 IRIX 5.1.x yes Note 1 & 2 IRIX 5.2 yes Note 1 & 2 IRIX 5.3 yes 3142 IRIX 6.0.x yes Note 1 & 2 IRIX 6.1 yes Note 1 & 2 IRIX 6.2 yes 3143 IRIX 6.3 yes 3144 IRIX 6.4 yes 3351 IRIX 6.5 yes 6.5.1 Note 3 IRIX 6.5.1 no NOTES 1) Upgrade to currently supported IRIX operating system. 2) See "Temporary Solution" section. 3) 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.3142 Algorithm #1 (sum -r): 49324 8 README.patch.3142 Algorithm #2 (sum): 61084 8 README.patch.3142 MD5 checksum: 2B1A5715ACEB0CDC4C18678A8002B6F1 Filename: patchSG0003142 Algorithm #1 (sum -r): 29610 1 patchSG0003142 Algorithm #2 (sum): 34053 1 patchSG0003142 MD5 checksum: 6BD0AA3B67430C2068FE9144D86C74D5 Filename: patchSG0003142.idb Algorithm #1 (sum -r): 32785 1 patchSG0003142.idb Algorithm #2 (sum): 35269 1 patchSG0003142.idb MD5 checksum: BF1E7D0BB1E46B1BDFF9979189F5360B Filename: patchSG0003142.x_eoe_sw Algorithm #1 (sum -r): 33648 213 patchSG0003142.x_eoe_sw Algorithm #2 (sum): 34214 213 patchSG0003142.x_eoe_sw MD5 checksum: B02985C04953B11AE03E11DE362A36E3 Filename: README.patch.3143 Algorithm #1 (sum -r): 25019 8 README.patch.3143 Algorithm #2 (sum): 21033 8 README.patch.3143 MD5 checksum: B564135EFDC38135580A8F6B7F42CFD0 Filename: patchSG0003143 Algorithm #1 (sum -r): 32423 1 patchSG0003143 Algorithm #2 (sum): 27066 1 patchSG0003143 MD5 checksum: 415ACF1ACFD6EA16B264492BAA55E207 Filename: patchSG0003143.idb Algorithm #1 (sum -r): 23124 1 patchSG0003143.idb Algorithm #2 (sum): 35279 1 patchSG0003143.idb MD5 checksum: 78CE6DFAD29790B3082AEB257A48A71A Filename: patchSG0003143.x_eoe_sw Algorithm #1 (sum -r): 40988 213 patchSG0003143.x_eoe_sw Algorithm #2 (sum): 61141 213 patchSG0003143.x_eoe_sw MD5 checksum: E1CC35856C0FB1D65D8399881C5E64F4 Filename: README.patch.3144 Algorithm #1 (sum -r): 14474 7 README.patch.3144 Algorithm #2 (sum): 20083 7 README.patch.3144 MD5 checksum: 34700B91B362B53ADB4741D1436DA239 Filename: patchSG0003144 Algorithm #1 (sum -r): 28337 1 patchSG0003144 Algorithm #2 (sum): 26275 1 patchSG0003144 MD5 checksum: BD9C4D0B2AEBE8DC674FCDF777124B38 Filename: patchSG0003144.idb Algorithm #1 (sum -r): 04654 1 patchSG0003144.idb Algorithm #2 (sum): 35038 1 patchSG0003144.idb MD5 checksum: F53D7B84B841E089C824603FBDFCCA32 Filename: patchSG0003144.x_eoe_sw Algorithm #1 (sum -r): 62709 211 patchSG0003144.x_eoe_sw Algorithm #2 (sum): 8545 211 patchSG0003144.x_eoe_sw MD5 checksum: F8275F4C685744FC32E0B46F62DE4CD4 Filename: README.patch.3351 Algorithm #1 (sum -r): 62541 7 README.patch.3351 Algorithm #2 (sum): 18263 7 README.patch.3351 MD5 checksum: 9B4F30943168D03E87F9A3CCE2D1E420 Filename: patchSG0003351 Algorithm #1 (sum -r): 51459 1 patchSG0003351 Algorithm #2 (sum): 32809 1 patchSG0003351 MD5 checksum: 128031560CEE2BA9D8988EAE99292E6C Filename: patchSG0003351.idb Algorithm #1 (sum -r): 36105 1 patchSG0003351.idb Algorithm #2 (sum): 35002 1 patchSG0003351.idb MD5 checksum: 24564AD152E4B65388DAA7BD9A5D205A Filename: patchSG0003351.x_eoe_sw Algorithm #1 (sum -r): 42288 212 patchSG0003351.x_eoe_sw Algorithm #2 (sum): 26656 212 patchSG0003351.x_eoe_sw MD5 checksum: 7A9742D4417ADBA74E64EE31DD7F2CE7 - ------------------------ - --- Acknowledgments --- - ------------------------ Silicon Graphics wishes to thank the CERT Coordination Center and the users of 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-alertat_private ------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-alertat_private 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-requestat_private 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-alertat_private 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 iQCVAwUBNiZfFbQ4cFApAP75AQGNogP/QIH9LHZgJ3wZqYxtjvEbf7VdbBItUe0L E66H8PqoPu9UASt78/AXwAF1GOvcBZV11iMPm3knhwB0LX2eSFgxVPrVLIot99Zd 3m47crNJQpqaxsoqPO9QAWdfA2wkmY2LDefsCF5nnH3RYxJPtNhnJv3+Dzjevm4h iIxmn3voxrE= =Ynfb -----END PGP SIGNATURE-----
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