Published:
22 July 1998
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-98.118 -- SGI Security Advisory 19980701-01-P IRIX 6.4 ioconfig(1M) and disk_bandwidth(1M) Vulnerability 23 July 1998 =========================================================================== Silicon Graphics Inc. has released the following advisory concerning a vulnerability discovered in both ioconfig(1M) and disk_bandwidth(1M) programs that can lead to a root compromise of the system. The following security bulletin is provided as a service to AusCERT's members. As AusCERT did not write this document, AusCERT has had no control over its content. As such, the decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It will not be updated when the original bulletin is. If downloading at a later date, it is recommended that the bulletin is retrieved from the original authors to ensure that the information is still current. Contact information for SGI is included in the Security Bulletin below. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. - ------------------------BEGIN INCLUDED TEXT----------------------- - -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ Silicon Graphics Inc. Security Advisory Title: IRIX 6.4 ioconfig(1M) and disk_bandwidth(1M) Vulnerability Number: 19980701-01-P Date: July 20, 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 IRIX ioconfig(1M) program assigns logical controller numbers to all I/O devices on a Silicon Graphics Origin or Onyx2 system. The IRIX disk_bandwidth(1M) program is used to determine the number of I/O operations that can be performed on a given disk device on an Origin or Onyx2 system. Both programs are normally only used by IRIX System administrators. Unfortunately, a vulnerability has been discovered in both ioconfig(1M) and disk_bandwidth(1M) programs that can lead to a root compromise of the system. 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 ioconfig(1M)/disk_bandwidth(1M) programs are installed by default on all IRIX 6.4 S2MP Origin and Onyx2 systems. A local user account on the vulnerable system is required in order to exploit the ioconfig(1M)/disk_bandwidth(1M) vulnerability locally and remotely. This vulnerability has been publically discussed in Usenet newsgroups and mailing lists. - - ----------------- - - ---- Solution --- - - ----------------- The steps below can be used to remove the vulnerability by restricting permissions of the ioconfig(1M)/disk_bandwidth(1M) programs to the root user. 1) Become the root user on the system. % /bin/su - Password: # 2) Verify the vulnerable ioconfig(1M)/disk_bandwidth(1M) programs are installed. Only IRIX 6.4 S2MP for Origin/Onyx2 is vulnerable. # uname -R 6.4 S2MP+OCTANE 3) Remove permissions on the vulnerable ioconfig(1M) and disk_bandwidth(1M) programs. # /bin/chmod 500 /sbin/ioconfig # /bin/chmod 500 /sbin/disk_bandwidth ************ *** NOTE *** ************ Removing permissions from the vulnerable programs will prevent non-root users from accessing ioconfig(1M) and disk_bandwidth(1M). 4) Verify the new permissions on the program. Note that the program size may be different depending on release. # ls -al /sbin/ioconfig /usr/sbin/disk_bandwidth -r-x------ 1 root sys 34024 Feb 20 16:53 ioconfig -r-x------ 1 root sys 17604 Dec 18 1997 disk_bandwidth 5) Return to previous user level. # exit % - - ------------------------- - - ---- 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 <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 iQCVAwUBNbPJCLQ4cFApAP75AQGkPQP/baaHH5TYuMzJCkyj1ZyaMb2onb6wOQ1B fearTK4dWE+mJ3G72V3TpPwPu4DJYKSs/xdGlaeW7bWB505efj6mQdY97L3+B0SI 9HbdsS4pyHMPTeVJH+pjh/wr9mD81elaNgzvXVMIBsUNb/8Xz8wrFJjSikPQWgmo y6JaCXW48jk= =3ID2 - -----END PGP SIGNATURE----- - -------------------------END INCLUDED TEXT------------------------ -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBNcWIGSh9+71yA2DNAQFzhgP9FG1gi0ZAv9pGJs9eCbq3+P0WiVbA9mHr 2xiYW2hsFutH4YKxA4oPxRN4kXZEB8dWrUP9ZgK+7lWboEbIHpMsp8bXSbOUPbQ6 kKIF/wRw7zE1czPyPifmk7Y2wOaXcMKA4A9bSKdYkAwQY8l9zg2iY/JUhdIvBVU9 ujKOlXgzn5g= =4Q4E -----END PGP SIGNATURE-----