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Category:   OS (UNIX)  >   Login Vendors:   SGI (Silicon Graphics)
SGI IRIX Login Hole May Let Local Users Gain Root Privileges
SecurityTracker Alert ID:  1007225
SecurityTracker URL:  http://securitytracker.com/id/1007225
CVE Reference:   CVE-2003-0574   (Links to External Site)
Date:  Jul 17 2003
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to IRIX 6.5.21
Description:   A vulnerability was reported in SGI's IRIX operating system in the login utility (/usr/lib/iaf/scheme). A local user may be able to gain root privileges on the system.

SGI reported that a local user can set specific environment variables and then call /usr/lib/iaf/scheme (login) to cause the scheme binary to dump core. The binary is reportedly configured with set user id (setuid) root user privileges. A local user may be able to gain root access on the system.

SGI credits Walter Roberson with reporting this flaw.

SGI notes that this is a different vulnerability than the flaw reported in CERT advisories CA-2001-34 and CA-1997-21.

Impact:   A local user may be able to obtain root privileges.
Solution:   The vendor has issued a fixed version of IRIX (6.5.21). The vendor has also issued a patch (5182) for 6.5.16 - 6.5.20.

The patch files and checksums are:

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

Vendor URL:  www.sgi.com/support/security/ (Links to External Site)
Cause:   Exception handling error

Message History:   None.


 Source Message Contents

Subject:  Login Vulnerabilities on IRIX


-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________
                           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 PGP SIGNATURE-----
    Copyright 2003, Silicon Graphics, Inc. All Rights Reserved.
    http://www.sgi.com/support/security/


 
 


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