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
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- -------------
- --- 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@xxxxxxxx
------oOo------
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