Operating System:


18 December 2001

Protect yourself against future threats.


             AUSCERT External Security Bulletin Redistribution

                   ESB-2001.543 -- SGI Security Advisory
                 Buffer Overflow in System V Derived Login
                             19 December 2001


        AusCERT Security Bulletin Summary

Product:                login
Vendor:                 SGI
Operating System:       IRIX
Impact:                 Root Compromise
Access Required:        Remote

Ref:                    AL-2001.19

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                          SGI Security Advisory

         Title:  Buffer Overflow in System V Derived Login
        Number:  20011201-01-I
     Reference:  CERT® Advisory CA-2001-34
          Date:  December 17, 2001

SGI provides this information freely to the SGI user community for its
consideration, interpretation, implementation and use.   SGI recommends
that this information be acted upon as soon as possible.

SGI 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 SGI 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 ---

 login is a program that local and remote connection mechanisms often
 invoke to facilitate logging into a Unix system.

 A vulnerability has been discovered in the login program for many
 System V-derived Unix implementations that allows unauthorized root
 access.  More details can be found in CERT advisory CA-2001-34:

 Silicon Graphics has investigated the issue and finds that IRIX 3.x may
 have had this issue, as mentioned in the CERT advisory.  Any versions of
 IRIX that are more current than IRIX 3.x, including IRIX 4.x, IRIX 5.x,
 and IRIX 6.x, do NOT have this login vulnerability, and no further action
 is required.

 --- Information ---

 SGI Security Advisories can be found at:
 http://www.sgi.com/support/security/ and

 SGI Security Patches can be found at:
 http://www.sgi.com/support/security/ and

 SGI patches for IRIX can be found at the following patch servers:
 http://support.sgi.com/irix/ and ftp://patches.sgi.com/

 SGI freeware updates for IRIX can be found at:

 SGI fixes for SGI open sourced code can be found on:

 SGI patches and RPMs for Linux can be found at:
 http://support.sgi.com/linux/ or

 SGI patches for Windows NT or 2000 can be found at:

 IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
 http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/

 IRIX 6.5 Maintenance Release Streams can be found at:

 IRIX 6.5 Software Update CDs can be obtained from:

 The primary SGI anonymous FTP site for security advisories and patches is
 patches.sgi.com (  Security advisories and patches are
 located under the URL ftp://patches.sgi.com/support/free/security/

 For security and patch management reasons, ftp.sgi.com (mirrors
 patches.sgi.com security FTP repository) lags behind and does not do a
 real-time update.

 --- Acknowledgments ----

 SGI wishes to thank CERT and the Internet Community at large for
 their assistance in this matter.

 --- SGI Security Information/Contacts ---

 If there are questions about this document, email can be sent to


 SGI 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 advisories and patches is
 patches.sgi.com (  Security advisories and patches are
 located under the URL ftp://patches.sgi.com/support/free/security/

 The SGI Security Headquarters Web page is accessible at the URL:

 For issues with the patches on the FTP sites, email can be sent to

 For assistance obtaining or working with security patches, please
 contact your SGI support provider.


 SGI 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>

 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.


 SGI provides a comprehensive customer World Wide Web site. This site is
 located at http://www.sgi.com/support/security/ .


 If there are general security questions on SGI systems, email can be sent to

 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, SGI is appropriately credited and the document retains and
       includes its valid PGP signature.

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