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Denial of Service Vulnerability in NFS XDR decoding Update



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______________________________________________________________________________
                           SGI Security Advisory

  Title    : Denial of Service Vulnerability in NFS XDR decoding Update
  Number   : 20030801-02-P
  Date     : September 9, 2003
  Reference: CVE CAN-2003-0576
  Reference: SGI BUGS 894659, 898951
  Fixed in : IRIX 6.5.20 or patches listed below for IRIX 6.5.17-6.5.19
______________________________________________________________________________

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.
______________________________________________________________________________

- -------------------
- --- Update Info ---
- -------------------

This bulletin is a followup to SGI Security Bulletin 20030801-01-P:
ftp://patches.sgi.com/support/free/security/advisories/20030801-01-P
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0576

An incomplete list of patches was referenced.  Some of the patches
referenced in 20030801-01-P did not apply cleanly. New patches have
been created that will apply cleanly on current IRIX systems.


- -----------------------
- --- Issue Specifics ---
- -----------------------

It's been reported that it is possible to create a Denial of Service attack
on the IRIX nfsd through the use of carefully crafted packets which cause
XDR decoding errors. This can lead to kernel panicing the system.  No local 
account or access to an NFS mount point is required, so this could be 
constructed as a remote exploit.

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 with patches and in future releases of IRIX.


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

nfs is installed by default on IRIX 6.5 systems.

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.

To see if nfs is installed, execute the following command:

$ versions -b | grep nfs
I  nfs                  05/15/2003  Network File System, 6.5.20f


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

There is no effective workaround available for these problems.  SGI
recommends either upgrading to IRIX 6.5.20, 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 6.5.20, 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                       Notes 2 & 3
   IRIX 6.5.17m      yes     5299              Notes 2, 4 & 5
   IRIX 6.5.17f      yes     5300              Notes 2, 4 & 5
   IRIX 6.5.18m      yes     5240              Notes 2, 4, 5, & 6
   IRIX 6.5.18f      yes     5241              Notes 2, 4, 5, & 6
   IRIX 6.5.19m      yes     5309+5311         Notes 2, 4, 5, & 6
   IRIX 6.5.19f      yes     5310+5312         Notes 2, 4, 5, & 6
   IRIX 6.5.20        no
   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 6.5.20.

     4) Upgrade to IRIX 6.5.20 or install the required patch(es)
        based on your hardware platform.

     5) Note that these patches also include other fixes that are not
        security related.

     6) For 6.5.18/19 IP35 platforms (O300/O3000, Fuel, Tezro),
        the patch matrix is:

          IRIX 6.5.18m  5213
          IRIX 6.5.18f  5261
          IRIX 6.5.19m  5309+5297
          IRIX 6.5.19f  5310+5298

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

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Filename:                 patchSG0005213
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Filename:                 patchSG0005213.nfs_sw
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Filename:                 patchSG0005240.eoe_sw
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Filename:                 patchSG0005240.irix_dev_sw
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Filename:                 patchSG0005240.nfs_sw
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Filename:                 README.patch.5241
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Filename:                 patchSG0005241
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MD5 checksum:             5C6423A1D130E749E6644CDE3CD73FF3

Filename:                 patchSG0005241.eoe_sw
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Filename:                 patchSG0005241.irix_dev_sw
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MD5 checksum:             D53D8B75C2D7B3A3C925ADCFB35F8B95

Filename:                 patchSG0005241.nfs_sw
Algorithm #1 (sum -r):    09049 3954 patchSG0005241.nfs_sw
Algorithm #2 (sum):       32772 3954 patchSG0005241.nfs_sw
MD5 checksum:             B28A5B503F0B5C85D62C76A666667685

Filename:                 README.patch.5261
Algorithm #1 (sum -r):    49730 16 README.patch.5261
Algorithm #2 (sum):       12479 16 README.patch.5261
MD5 checksum:             1E0425C87FC8E70F17F8DBCA2045B9A0

Filename:                 patchSG0005261
Algorithm #1 (sum -r):    51002 8 patchSG0005261
Algorithm #2 (sum):       17205 8 patchSG0005261
MD5 checksum:             F4A379CB4B2D7EF2D856F341E10D55E3

Filename:                 patchSG0005261.eoe_sw
Algorithm #1 (sum -r):    23283 5593 patchSG0005261.eoe_sw
Algorithm #2 (sum):       53331 5593 patchSG0005261.eoe_sw
MD5 checksum:             A31456714875F2DF221B30AFF675E69E

Filename:                 patchSG0005261.idb
Algorithm #1 (sum -r):    50233 11 patchSG0005261.idb
Algorithm #2 (sum):       41910 11 patchSG0005261.idb
MD5 checksum:             B3AD01892954B22E7F68127B59087CA2

Filename:                 patchSG0005261.irix_dev_sw
Algorithm #1 (sum -r):    38535 10 patchSG0005261.irix_dev_sw
Algorithm #2 (sum):       12894 10 patchSG0005261.irix_dev_sw
MD5 checksum:             D53D8B75C2D7B3A3C925ADCFB35F8B95

Filename:                 patchSG0005261.nfs_sw
Algorithm #1 (sum -r):    31956 422 patchSG0005261.nfs_sw
Algorithm #2 (sum):       11414 422 patchSG0005261.nfs_sw
MD5 checksum:             12B70352F402174FFD6B033869D7E024

Filename:                 README.patch.5297
Algorithm #1 (sum -r):    48845 23 README.patch.5297
Algorithm #2 (sum):       32300 23 README.patch.5297
MD5 checksum:             2090A1E436E3F0E8DB64715AEB95818C

Filename:                 patchSG0005297
Algorithm #1 (sum -r):    43330 9 patchSG0005297
Algorithm #2 (sum):       20967 9 patchSG0005297
MD5 checksum:             18F9918E3EF373AD85C64386AEC0D4E1

Filename:                 patchSG0005297.eoe_man
Algorithm #1 (sum -r):    58730 28 patchSG0005297.eoe_man
Algorithm #2 (sum):       53579 28 patchSG0005297.eoe_man
MD5 checksum:             C45CFA5847A4A277933B66E7BC75270B

Filename:                 patchSG0005297.eoe_sw
Algorithm #1 (sum -r):    19297 11239 patchSG0005297.eoe_sw
Algorithm #2 (sum):       37563 11239 patchSG0005297.eoe_sw
MD5 checksum:             A4BDB4CA50EC789CBEF6E695776AFD62

Filename:                 patchSG0005297.idb
Algorithm #1 (sum -r):    15626 25 patchSG0005297.idb
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MD5 checksum:             B37753F599C603576842E1C250FC20C4

Filename:                 patchSG0005298
Algorithm #1 (sum -r):    06814 9 patchSG0005298
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MD5 checksum:             C707E122F202CCB1348D04859D0CF857

Filename:                 patchSG0005298.eoe_man
Algorithm #1 (sum -r):    58730 28 patchSG0005298.eoe_man
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Filename:                 patchSG0005298.eoe_sw
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MD5 checksum:             2F30C016B2F1D630F0F0C319981E8D8B

Filename:                 patchSG0005298.idb
Algorithm #1 (sum -r):    22626 25 patchSG0005298.idb
Algorithm #2 (sum):       5212 25 patchSG0005298.idb
MD5 checksum:             64F1BB609FEDE5E5627F46E04B3F4F6C

Filename:                 README.patch.5299
Algorithm #1 (sum -r):    41188 9 README.patch.5299
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MD5 checksum:             FBFE8A19BDDE01B495E057C8D7D83A16

Filename:                 patchSG0005299
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Filename:                 patchSG0005299.eoe_sw
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MD5 checksum:             E667C1503149945361387176FDC6BB8E

Filename:                 patchSG0005299.idb
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MD5 checksum:             344E65F22D98E89429810659D357EE7C

Filename:                 patchSG0005299.nfs_sw
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Filename:                 README.patch.5300
Algorithm #1 (sum -r):    06846 9 README.patch.5300
Algorithm #2 (sum):       15937 9 README.patch.5300
MD5 checksum:             45D2022C2E6C5DEB75E1E75426885EC9

Filename:                 patchSG0005300
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Algorithm #2 (sum):       8768 3 patchSG0005300
MD5 checksum:             3DF9A0C6897F90A75E33B84633D4FCF9

Filename:                 patchSG0005300.eoe_sw
Algorithm #1 (sum -r):    42290 6009 patchSG0005300.eoe_sw
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Filename:                 patchSG0005300.idb
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Filename:                 patchSG0005300.nfs_sw
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MD5 checksum:             EC9DD6232C07823F730D54A38B4DC9D7

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Algorithm #2 (sum):       47098 2100 patchSG0005311.eoe_sw
MD5 checksum:             62B1D0038E9DC46B049756F6A2A08418

Filename:                 patchSG0005311.idb
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Algorithm #2 (sum):       14158 7 patchSG0005311.idb
MD5 checksum:             61E20566BCC33D33268A3860D4A03CD0

Filename:                 README.patch.5312
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Algorithm #2 (sum):       25656 8 README.patch.5312
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Filename:                 patchSG0005312
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Algorithm #2 (sum):       53505 2 patchSG0005312
MD5 checksum:             1661EAD503FB30D030BA3248359C023C

Filename:                 patchSG0005312.eoe_sw
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Algorithm #2 (sum):       37755 2163 patchSG0005312.eoe_sw
MD5 checksum:             ACC64E74152BAE2844A5E5FA0CCA7A91

Filename:                 patchSG0005312.idb
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Algorithm #2 (sum):       14196 7 patchSG0005312.idb
MD5 checksum:             FBA8CB90ADC53FB0BAFBECD33899C93E


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

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

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______________________________________________________________________________
      This information is provided freely to all interested parties
      and may be redistributed provided that it is not altered in any
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      includes its valid PGP signature.

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