Date: Wed, 13 Aug 2003 09:42:44 -0700
From: SGI Security Coordinator <[email protected]>
To: [email protected]Subject: Denial of Service Vulnerability in NFS on IRIX
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______________________________________________________________________________
SGI Security Advisory
Title : Denial of Service Vulnerability in NFS XDR decoding
Number : 20030801-01-P
Date : August 13, 2003
Reference: CVE 2003-0576
Reference: SGI BUG 894659
Fixed in : IRIX 6.5.20 or patches 5229, 5230, 5240, 5241, 5227, 5228
______________________________________________________________________________
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 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 5229 Notes 2, 4 & 5
IRIX 6.5.17f yes 5230 Notes 2, 4 & 5
IRIX 6.5.18m yes 5240 Notes 2, 4 & 5
IRIX 6.5.18f yes 5241 Notes 2, 4 & 5
IRIX 6.5.19m yes 5227 Notes 2, 4 & 5
IRIX 6.5.19f yes 5228 Notes 2, 4 & 5
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 patch.
5) Note that these patches also include other fixes that are not
security related.
##### Patch File Checksums ####
Filename: README.patch.5227
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MD5 checksum: 7ED03B2BE0DC6DE5D33D81339AB14017
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Filename: patchSG0005227.eoe_sw
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MD5 checksum: 32BF7447A53E8A9DAD84A2B416674F16
Filename: patchSG0005227.irix_dev_sw
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MD5 checksum: D53D8B75C2D7B3A3C925ADCFB35F8B95
Filename: patchSG0005227.nfs_sw
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Filename: patchSG0005228.eoe_sw
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MD5 checksum: EFB7678E25D935BFDF9B8531786FE67A
Filename: patchSG0005228.idb
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Algorithm #2 (sum): 21988 41 patchSG0005228.idb
MD5 checksum: 92B4E031662EEF88415D18A2ABE8CA74
Filename: patchSG0005228.irix_dev_sw
Algorithm #1 (sum -r): 38535 10 patchSG0005228.irix_dev_sw
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MD5 checksum: D53D8B75C2D7B3A3C925ADCFB35F8B95
Filename: patchSG0005228.nfs_sw
Algorithm #1 (sum -r): 17463 5280 patchSG0005228.nfs_sw
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MD5 checksum: DCEAE822C6F2AE0335987F8D4CB22037
Filename: README.patch.5229
Algorithm #1 (sum -r): 01277 9 README.patch.5229
Algorithm #2 (sum): 828 9 README.patch.5229
MD5 checksum: 27F5BC248785EB885A13CC882BC3546F
Filename: patchSG0005229
Algorithm #1 (sum -r): 35802 2 patchSG0005229
Algorithm #2 (sum): 57891 2 patchSG0005229
MD5 checksum: FC923269FA4B82B7B74C6406982A9BF7
Filename: patchSG0005229.eoe_sw
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MD5 checksum: 566A389D3F36A1398FA7EEC56BF175B9
Filename: patchSG0005229.idb
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MD5 checksum: 60B99ECECF97909AEF3F4A2DE88D82F5
Filename: patchSG0005229.irix_dev_sw
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MD5 checksum: 782988FA4FAC22A5F522D4985B47D6CB
Filename: patchSG0005229.nfs_sw
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MD5 checksum: C8D28197ABBFB214E312BE5474089CFE
Filename: README.patch.5230
Algorithm #1 (sum -r): 12236 9 README.patch.5230
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MD5 checksum: 12E5B2318D3B3516409D084C27387163
Filename: patchSG0005230
Algorithm #1 (sum -r): 50666 2 patchSG0005230
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MD5 checksum: 44FE30C482E00898A48FB5C865A63FF3
Filename: patchSG0005230.eoe_sw
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Filename: patchSG0005230.idb
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MD5 checksum: 3E3AE7ACC124D1789D16E6510C58D9DB
Filename: patchSG0005230.nfs_sw
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MD5 checksum: D53D8B75C2D7B3A3C925ADCFB35F8B95
Filename: patchSG0005240.nfs_sw
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Filename: patchSG0005241.eoe_sw
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Filename: patchSG0005241.idb
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Filename: patchSG0005241.irix_dev_sw
Algorithm #1 (sum -r): 38535 10 patchSG0005241.irix_dev_sw
Algorithm #2 (sum): 12894 10 patchSG0005241.irix_dev_sw
MD5 checksum: D53D8B75C2D7B3A3C925ADCFB35F8B95
Filename: patchSG0005241.nfs_sw
Algorithm #1 (sum -r): 09049 3954 patchSG0005241.nfs_sw
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MD5 checksum: B28A5B503F0B5C85D62C76A666667685
- -------------
- --- 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:
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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.
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