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IRIX : ftpd minor vulnerabilities



_____________________________________________________________________________

                          SGI Security Advisory

        Title:      ftpd minor vulnerabilities
        Number:     20020305-03-I
        Date:       August 13, 2002
        Reference:  CERTŪ Vulnerability Note VU# 2558
        Reference:  CERTŪ 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@sgi.com.

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

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The primary SGI anonymous FTP site for security advisories and patches is
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The SGI Security Headquarters Web page is accessible at the URL:
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For assistance obtaining or working with security patches, please
contact your SGI support provider.

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

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

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______________________________________________________________________________
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