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From: agent99 at sgi.com (SGI Security Coordinator)
Subject: rpc.pcnfsd vulnerabilities on IRIX
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_____________________________________________________________________________
SGI Security Advisory
Title: rpc.pcnfsd vulnerabilities
Number: 20020802-01-I
Date: August 1, 2002
Reference: CERT? Advisory CA-1996-08
Reference: CAN-1999-0078
_____________________________________________________________________________
- -----------------------
- --- Issue Specifics ---
- -----------------------
It's been reported that there are vulnerabilities in the rpc.pcnfsd daemon
that is supplied with IRIX 6.5.
See http://www.cert.org/advisories/CA-1996-08.html for additional details.
These vulnerabilities were assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0078
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.
- --------------
- --- Impact ---
- --------------
The pcnfsd binary is not installed by default on IRIX 6.5 systems. It is
part of the optional pcnfsd subsystem on the NFS CD.
To determine the version of IRIX you are running, execute the following
command:
# uname -R
That will return a result similar to the following:
# 6.5 6.5.16f
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 pcnfs is installed, execute the following command:
# versions pcnfsd
I pcnfsd 02/24/1999 PC-NFS 2.0.2 Server Components
I pcnfsd.man 02/24/1999 PC-NFS Server Component Documentation
I pcnfsd.man.manpages 02/24/1999 PC-NFS Server Man Pages
I pcnfsd.man.relnotes 02/24/1999 PC-NFS Server Release Notes
I pcnfsd.spool 02/24/1999 PC-NFS Server Component Print Spooling
I pcnfsd.spool.directory 02/24/1999 PC-NFS Server Print Spooling Directory
I pcnfsd.sw 02/24/1999 PC-NFS Server Component Software
I pcnfsd.sw.base 02/24/1999 PC-NFS Server Base Subsystem
If the result is similar to that shown above, then pcnfs is installed and
the system may be vulnerable.
- ----------------------------
- --- Temporary Workaround ---
- ----------------------------
SGI has moved the pcnfs product to "Courtesy" mode, and there will be no
fixes released for this problem. See the following URL for details on the
different support modes:
http://support.sgi.com/news/support/SF_sw-policy-05-2002.html
SGI recommends uninstalling the pcnfsd package from the system, by
following these steps:
$ su -
# versions remove pcnfsd
It is not necessary to reboot the system after doing this, but you should
unexport and remove the /var/spool/pcnfs line in /etc/exports and remove
the /var/spool/pcnfs directory:
# exportfs -u /var/spool/pcnfs
# rmdir /var/spool/pcnfs
# cp /etc/exports /etc/exports.OLD
# sed '\/var\/spool\/pcnfs/d' /etc/exports > /tmp/tmpfile;
mv /tmp/tmpfile /etc/exports
- ----------------
- --- Solution ---
- ----------------
SGI has not provided patches for this vulnerability. Our recommendation is
to uninstall the product as outlined above.
The pcnfs package is no longer supported, but as a courtesy to SGI customers
a newer revision (pcnfsd-93.02.16-cert) has been ported by the SGI Freeware
volunteers and is available at http://freeware.sgi.com/index-by-alpha.html.
Please note that as with all SGI Freeware, this package is not supported by
SGI.
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
NOTES
1) This version of the IRIX operating has been retired. Upgrade to an
actively supported IRIX operating system. See
http://support.sgi.com/irix/news/index.html#policy 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/irix/swupdates/
3) Uninstall the pcnfsd package as described above.
- ------------------------
- --- Acknowledgments ----
- ------------------------
SGI wishes to thank Avalon Security Research, Rob Thomas, CERT, 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/irix/ and ftp://patches.sgi.com/
SGI freeware updates for IRIX can be found at:
http://freeware.sgi.com/
SGI fixes for SGI open sourced code can be found on:
http://oss.sgi.com/projects/
SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or
http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/
SGI patches for Windows NT or 2000 can be found at:
http://support.sgi.com/nt/
IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/
IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/colls/patches/tools/relstream/index.html
IRIX 6.5 Software Update CDs can be obtained from:
http://support.sgi.com/irix/swupdates/
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). 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@....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 (216.32.174.211). 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@....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
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------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@....com.
For reporting *NEW* SGI security issues, email can be sent to
security-alert@....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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