TUCoPS :: SGI :: n-123.txt

SGI Login Vulnerabilities (CIAC N-123)

             __________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

                           SGI Login Vulnerabilities
                     [SGI Security Advisory 20030702-01-P]

July 21, 2003 23:00 GMT                                           Number N-123
______________________________________________________________________________
PROBLEM:       Logging into an IRIX 6.5 machine while particular environment 
               variables are set can lead to /usr/lib/iaf/scheme (login) 
               dumping core. 
PLATFORM:      IRIX 6.5 systems 
DAMAGE:        "Scheme" is suid root, therefore this could potentially lead  
               to a root compromise. 
SOLUTION:      Upgrade to IRIX 6.5.21 or apply patches stated in SGI's 
               bulletin. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. The scheme binary is installed by default 
ASSESSMENT:    on IRIX 6.5 systems as part of eoe.sw.base. A local account is 
               required to exploit any of these vulnerabilities. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-123.shtml 
 ORIGINAL BULLETIN:                                                           
                     ftp://patches.sgi.com/support/free/security/advisories
                           /20030702-01-P 
______________________________________________________________________________

[***** Start SGI Security Advisory 20030702-01-P *****]

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______________________________________________________________________________
                           SGI Security Advisory

Title    : Login Vulnerabilities
Number   : 20030702-01-P
Date     : July 16, 2003
Reference: CVE CAN-2003-0574
Reference: SGI BUGS 850587 889119  
Fixed in : IRIX 6.5.21 or patch 5182
______________________________________________________________________________

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 ---
- -----------------------

It's been reported that logging into an IRIX 6.5 machine while particular
environment variables are set can lead to /usr/lib/iaf/scheme (login)
dumping core. Since "scheme" is suid root, this could potentially lead to a
root compromise.  A local account would be required to exploit any such
vulnerability.

This issue was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0574

Please note that this is not the same issue as reported in 
CERT advisory CA-2001-34 or CERT advisory CA-1997-21 (CVE-1999-0028).

SGI 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. 

These issues have been corrected in future releases of IRIX.


- --------------
- --- Impact ---
- --------------

The scheme binary is installed by default on IRIX 6.5 systems as part of
eoe.sw.base.  

To determine the version of IRIX you are running, execute the following
command: 

  # /bin/uname -R
  
That will return a result similar to the following:

  # 6.5 6.5.19f
  
The first number ("6.5") is the release name, the second ("6.5.16f" in this
case) is the extended release name.  The extended release name is the
"version" we refer to throughout this document.  


- ----------------------------
- --- Temporary Workaround ---
- ----------------------------

There is no effective workaround available for these problems.  SGI
recommends either upgrading to IRIX 6.5.21, or installing the appropriate
patch from the listing below.


- ----------------
- --- Solution ---
- ----------------

SGI has provided a series of patches for these vulnerabilities. Our
recommendation is to upgrade to IRIX 6.5.21, or install the appropriate
patch.

   OS Version     Vulnerable?     Patch #      Other Actions
   ----------     -----------     -------      -------------    
   IRIX 3.x        unknown                     Note 1
   IRIX 4.x        unknown                     Note 1
   IRIX 5.x        unknown                     Note 1
   IRIX 6.0.x      unknown                     Note 1          
   IRIX 6.1        unknown                     Note 1         
   IRIX 6.2        unknown                     Note 1
   IRIX 6.3        unknown                     Note 1
   IRIX 6.4        unknown                     Note 1
   IRIX 6.5          yes                       Notes 2 & 3
   IRIX 6.5.1        yes                       Notes 2 & 3
   IRIX 6.5.2        yes                       Notes 2 & 3
   IRIX 6.5.3        yes                       Notes 2 & 3
   IRIX 6.5.4        yes                       Notes 2 & 3
   IRIX 6.5.5        yes                       Notes 2 & 3
   IRIX 6.5.6        yes                       Notes 2 & 3
   IRIX 6.5.7        yes                       Notes 2 & 3
   IRIX 6.5.8        yes                       Notes 2 & 3
   IRIX 6.5.9        yes                       Notes 2 & 3
   IRIX 6.5.10       yes                       Notes 2 & 3
   IRIX 6.5.11       yes                       Notes 2 & 3
   IRIX 6.5.12       yes                       Notes 2 & 3
   IRIX 6.5.13       yes                       Notes 2 & 3
   IRIX 6.5.14       yes                       Notes 2 & 3
   IRIX 6.5.15       yes                       Notes 2 & 3
   IRIX 6.5.16       yes            5182       Notes 2 & 4
   IRIX 6.5.17       yes            5182       Notes 2 & 4
   IRIX 6.5.18       yes            5182       Notes 2 & 4
   IRIX 6.5.19       yes            5182       Notes 2 & 4
   IRIX 6.5.20       yes            5182       Notes 2 & 4
   IRIX 6.5.21        no
   
   NOTES
 
     1) This version of the IRIX operating has been retired. Upgrade to an
        actively supported IRIX operating system.  See
        http://support.sgi.com for more information.

     2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your 
        SGI Support Provider or URL: http://support.sgi.com

     3) Upgrade to IRIX 6.5.21 or later.
     
     4) Install patch 5182.

             ##### Patch File Checksums ####

The actual patch will be a tar file containing the following files:

Filename:                 README.patch.5182
Algorithm #1 (sum -r):    38247 8 README.patch.5182
Algorithm #2 (sum):       42384 8 README.patch.5182
MD5 checksum:             0176171441AE46078FDBB1DB630C8397

Filename:                 patchSG0005182
Algorithm #1 (sum -r):    40388 2 patchSG0005182
Algorithm #2 (sum):       1995 2 patchSG0005182
MD5 checksum:             B5A294E9B777C62DF04CEC66012BEFA8

Filename:                 patchSG0005182.eoe_sw
Algorithm #1 (sum -r):    33077 76 patchSG0005182.eoe_sw
Algorithm #2 (sum):       57300 76 patchSG0005182.eoe_sw
MD5 checksum:             84429D3529CE8B6F09508EDF68037580

Filename:                 patchSG0005182.idb
Algorithm #1 (sum -r):    23124 2 patchSG0005182.idb
Algorithm #2 (sum):       42608 2 patchSG0005182.idb
MD5 checksum:             367E564FC2EC650A0B632EB0EC9374E1


- ------------------------
- --- Acknowledgments ----
- ------------------------

SGI wishes to thank Walter Roberson, FIRST and the users of the Internet
Community at large for their assistance in this matter.


- -------------
- --- Links ---
- -------------

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

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

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

SGI freeware updates for IRIX can be found at:
http://freeware.sgi.com/

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

SGI patches for Windows NT or 2000 can be found at:
http://support.sgi.com/

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

IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/

IRIX 6.5 Software Update CDs can be obtained from:
http://support.sgi.com/

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.


- -----------------------------------------
- --- SGI Security Information/Contacts ---
- -----------------------------------------

If there are questions about this document, email can be sent to
security-info@sgi.com.

                      ------oOo------

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:
http://www.sgi.com/support/security/

For issues with the patches on the FTP sites, email can be sent to 
security-info@sgi.com.

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

                      ------oOo------

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 such as zedwatch@sgi.com > 
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------

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

                      ------oOo------

If there are general security questions on SGI systems, email can be sent to
security-info@sgi.com.

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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[***** End SGI Security Advisory 20030702-01-P *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Silicon Graphics, Inc. (SGI) for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

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