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Message-ID: <10208131612.ZM331157@einstein.csd.sgi.com>
From: agent99 at sgi.com (SGI Security Coordinator)
Subject: IRIX ftpd minor vulnerabilities
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_____________________________________________________________________________
SGI Security Advisory
Title: ftpd minor vulnerabilities
Number: 20020305-03-I
Date: August 13, 2002
Reference: CERT? Vulnerability Note VU# 2558
Reference: CERT? CA-1997-27
Reference: SGI Security Advisory 20020305-02-I
Reference: CVE-1999-0351
Reference: CVE-1999-0017
_____________________________________________________________________________
- -----------------------
- --- Issue Specifics ---
- -----------------------
It has been reported that there are fundamental design issues in the FTP
protocol which exhibit themselves as vulnerabilities in the ftpd daemon.
1) the "Pizza Thief" exploit, a minor security issue involving FTP
connections when the PASV mode is being used.
See the following URLs for additional details:
http://www.kb.cert.org/vuls/id/2558
http://www.infowar.com/iwftp/iw_sec/iw_sec_01.txt
2) the "FTP_PrivilegedPort" exploit, a minor security issue involving
FTP connections when the PORT mode is being used.
See the following URLs for additional details:
http://www.kbeta.com/attacklist/FTP_PrivilegedPort.htm
http://www.cert.org/advisories/CA-1997-27.html
ftp://patches.sgi.com/support/free/security/advisories/20020305-02-I
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 binary /usr/etc/ftpd daemon 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:
# 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.
A local account is required to exploit the FTP_PrivilegedPort exploit,
but not the the Pizza Thief exploit.
The "Pizza Thief" exploit was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0351
The FTP Privileged Port exploit was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0017
- ----------------------------
- --- Temporary Workaround ---
- ----------------------------
SGI understands that there are times when upgrading the operating system or
installing patches are inconvenient or not possible. In those instances, we
recommend disabling ftpd as a workaround until the operating system can be
upgraded. Follow these steps to disable ftpd:
1) become superuser
% su -
2) edit the /etc/inetd.conf file
# vi /etc/inetd.conf
3) find the line in inetd.conf that looks like this:
ftp stream tcp nowait root /usr/etc/ftpd ftpd -l
4) comment the line out so it looks like the following line:
#ftp stream tcp nowait root /usr/etc/ftpd ftpd -l
...then save the file and exit from the editor.
5) send a hangup signal to the inetd daemon to get it to reread the
configuration file and implement the changes:
# killall -HUP inetd
6) kill any running ftpd processes:
# killall ftpd
It is not necessary to reboot the system after performing this procedure.
Note that ftp server services will no longer be available from the system
after performing these steps. Normal ftp client services will still be
available.
- ----------------
- --- Solution ---
- ----------------
SGI has not provided patches for these minor vulnerabilities. Our
recommendation is to upgrade to IRIX 6.5.17 when available.
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 6.5.17 no Note 4
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) Upgrade to IRIX 6.5.17 or use the supplied workaround.
IRIX 6.5.17 maintenance release can be downloaded from:
http://support.sgi.com/colls/patches/tools/relstream/index.html
4) ftpd must be run with the -p flag for this to take effect.
- ------------------------
- --- Acknowledgments ----
- ------------------------
SGI wishes to thank 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------
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encourages interested parties to self-subscribe to receive (via email) all
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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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