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Category:   Application (Security)  >   ipfilterd (/dev/ipfilter) Vendors:   SGI (Silicon Graphics)
SGI IRIX Operating System 'ipfilterd' Configuration Error Lets Local Users Disrupt Network Traffic
SecurityTracker Alert ID:  1004195
SecurityTracker URL:  http://securitytracker.com/id/1004195
CVE Reference:   CVE-2002-0172   (Links to External Site)
Date:  May 1 2002
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in SGI's "ipfilterd" packet filtering implementation. A local user could cause denial of service conditions.

SGI reported that unsafe default permissions (644, world readable) on the /dev/ipfilter file (device) as created by /dev/MAKEDEV could allow a local, non-root user to disrupt network traffic.

The /dev/ipfilter device is reportedly created by default on IRIX 6.5 systems during installation but the ipfilterd packet filtering software that is intended to use this device is not installed by default (it is part of the eoe.sw.ipgate package).

To determine if you are vulnerable, execute the following command:

$ ls -l /dev/ipfilter
crw-r--r-- 1 root sys 59, 0 Apr 12 08:33 /dev/ipfilter

If your /dev/ipfilter shows the above permissions (644) and ownership (root, sys), then you are vulnerable, according to the report.

No further details were provided.

Impact:   A local user can disrupt network traffic.
Solution:   SGI has issued a fixed version (IRIX 6.5.11) and recommends upgrading to that version or later.


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, no,,
IRIX 6.5.12, no,,
IRIX 6.5.13, no,,
IRIX 6.5.14, no,,
IRIX 6.5.15, no,,
IRIX 6.5.16, 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/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 6.5.11 or later.

As a temporary workaround:

You can fix the permissions of /dev/ipfilter with the following command:

# chmod 600 /dev/ipfilter

After running that command, it should look like this:

# ls -l /dev/ipfilter
crw------- 1 root sys 59, 0 Apr 12 08:33 /dev/ipfilter

However, SGI recommends upgrading to IRIX 6.5.11 or later because if the /dev/MAKEDEV script is run it will reset the permissions to 644. The /dev/MAKEDEV script has been changed in IRIX 6.5.11 to create the device with 600 permissions.

Vendor URL:  www.sgi.com/ (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (SGI/IRIX)
Underlying OS Comments:  6.5 - 6.5.10

Message History:   None.


 Source Message Contents

Subject:  IRIX /dev/ipfilter Denial of Service vulnerability


-----BEGIN PGP SIGNED MESSAGE-----

_____________________________________________________________________________

                          SGI Security Advisory

        Title:      /dev/ipfilter Denial of Service vulnerability
        Number:     20020408-01-I
        Date:       April 30, 2002
        Reference:  CAN-2002-0172
______________________________________________________________________________

- -----------------------
- --- Issue Specifics ---
- -----------------------

SGI has determined that the default permissions on /dev/ipfilter as created
by /dev/MAKEDEV could lead to a Denial of Service attack.  The default
permissions were 644, and while the permissions are set to that value it is
possible for a non-root user to disrupt network traffic.

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 /dev/ipfilter device is created by default on IRIX 6.5 systems during
installation.  The ipfilterd software that is intended to use this device is
not installed by default, it is part of the eoe.sw.ipgate package.

To determine if you are vulnerable, execute the following command:

   $ ls -l /dev/ipfilter
   crw-r--r--    1 root     sys        59,  0 Apr 12 08:33 /dev/ipfilter

If your /dev/ipfilter shows the permissions and ownership of 644 as in the
example above, then you are vulnerable.

These vulnerabilities may not be exploited by a remote user, a local account
is required.

This issue has been corrected in IRIX 6.5.11 and later versions.

This vulnerability was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0172


- ----------------------------
- --- Temporary Workaround ---
- ----------------------------

You can fix the permissions of /dev/ipfilter with the following command:

   # chmod 600 /dev/ipfilter

After running that command, it should look like this:

   # ls -l /dev/ipfilter
   crw-------    1 root     sys        59,  0 Apr 12 08:33 /dev/ipfilter

However, SGI recommends upgrading to IRIX 6.5.11 or later because if the
/dev/MAKEDEV script is run it will reset the permissions to 644.  The
/dev/MAKEDEV script has been changed in IRIX 6.5.11 to create the device
with 600 permissions.


- ----------------
- --- Solution ---
- ----------------

SGI has not provided patches for this vulnerability. Our recommendation is
to upgrade to IRIX 6.5.11 or later.


   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       no
   IRIX 6.5.12       no
   IRIX 6.5.13       no
   IRIX 6.5.14       no
   IRIX 6.5.15       no
   IRIX 6.5.16       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/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 6.5.11 or later.


- -------------
- --- 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------

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@sgi.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
(http://www.sgi.com/support/security/wiretap.html) or by sending email to
SGI as outlined below.

% mail wiretap-request@sgi.com
subscribe wiretap <YourEmailAddress>
end
^d

In the example above, <YourEmailAddress> is the email address that you wish
the mailing list information sent to.  The word end must be on a separate
line to indicate the end of the body of the message. The control-d (^d) is
used to indicate to the mail program that you are finished composing the
mail message.


                      ------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@sgi.com.

For reporting *NEW* SGI security issues, email can be sent to
security-alert@sgi.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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