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Home : Advisories : IRIX webdist.cgi, handler and wrap programs

Title: IRIX webdist.cgi, handler and wrap programs
Released by: SGI
Date: 26th August 1997
Printable version: Click here


                Silicon Graphics Inc. Security Advisory

        Title:   IRIX webdist.cgi, handler and wrap programs

        Title:   CERT Advisory CA-97.12, AUSCERT Advisory AA-97.14

        Number:  19970501-02-PX

        Date:    August 26, 1997


Silicon Graphics provides this information freely to the SGI user community

for its consideration, interpretation, implementation and use.   Silicon

Graphics recommends that this information be acted upon as soon as possible.

Silicon Graphics 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

Silicon Graphics 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 ---

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

Several programs provided with the Outbox Environment subsystem have

been found to be insecure.  These are the cgi-bin programs webdist.cgi,

handler and wrap available for IRIX 5.x and 6.x.  Each of these programs

can be manipulated to execute arbitrary commands with potentially

elevated privileges.

Silicon Graphics Inc. 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.  This

issue will be corrected in future releases of IRIX.

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

- - --- Impact ---

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

In general, the Outbox subsystem is install by default on all SGI systems

starting with IRIX 6.2.  However, IRIX 5.x and pre-IRIX 6.2 systems may

have the Outbox subsystem as part of the Desktop software package.

For these particular vulnerabilities, a local account is not required.

Furthermore, each of these vulnerabilities can be exploited remotely.

Utilizing these vulnerabilities, arbitrary commands can be executed

with httpd daemon privileges.  Depending on configuration of the

http server, privileged access may be possible.

This issue has been publically disclosed and discussed in several

public forums including the BUGTRAQ mailing list in addition to

security advisories CERT CA-97.12 and AUSCERT AA-97.14

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

- - --- Software Check ---

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

To determine if the Outbox software is installed on a particular system,

the following command can be used:

   % /usr/sbin/versions outbox.sw

   I = Installed, R = Removed

      Name                 Date      Description

   I  outbox               03/23/97  Outbox Environment, 1.2

   I  outbox.sw            03/23/97  Outbox End-User Software, 1.2

   I  outbox.sw.outbox     03/23/97  Outbox Software Tools, 1.2

   I  outbox.sw.webdist    03/23/97  Web Software Distribution Tools, 1.2

In the above case, the Outbox software is installed and the

steps in either the "Temporary Solution" or "Solution" section

should be completed.

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

- - --- Temporary Solution ---

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

Although patches are available to address the vulnerabilities in

these programs, it is realized that there may be situations where

installing the patches immediately may not be possible.

Below, two possible solutions are provided to remove the

vulnerabilities.  In Solution A program permissions are changed

while in Solution B the Outbox subsystem is removed.  Either

solution can be used depending on site requirements.

Solution A - Change program permissions.

The steps below can be used to remove the vulnerabilities by removing

the permissions of the vulnerable programs.  The default installation

places these files in /var/www/cgi-bin, however, all cgi-bin directories

on a system should be checked for these programs.

     1) Become the root user on the system.

                % /bin/su -



     2) Change the permissions on the programs.

                # /bin/chmod 400 /var/www/cgi-bin/webdist.cgi

                # /bin/chmod 400 /var/www/cgi-bin/handler

                # /bin/chmod 400 /var/www/cgi-bin/wrap


                           *** NOTE ***


               By changing the permissions on these programs as above,

               these programs can not be executed by any user.

     3) Return to previous level.

                # exit


Solution B - Removal of the Outbox software.

     1) Become the root user on the system.

                % /bin/su -



     2) Remove the vulnerable outbox subsystem.

                # /usr/sbin/versions -v remove outbox

     3) Return to previous level.

                # exit


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

- - --- Solution ---

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

   OS Version     Vulnerable?     Patch #      Other Actions

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

   IRIX 3.x          no

   IRIX 4.x          no

   IRIX 5.0.x        no

   IRIX 5.1.x        no

   IRIX 5.2          no

   IRIX 5.3          yes          2315

   IRIX 6.0.x        yes          not avail    Note 1

   IRIX 6.1          yes          not avail    Note 1

   IRIX 6.2          yes          2314

   IRIX 6.3          yes          2338

   IRIX 6.4          yes          2338


     1) upgrade operating system or see "Temporary Solution" section.

Patches are available via anonymous FTP and your service/support provider.

The SGI anonymous FTP site is sgigate.sgi.com ( or its

mirror, ftp.sgi.com.   Security information and patches can be found

in the ~ftp/security and ~ftp/patches directories, respectfully.

                 ##### Patch File Checksums ####

The actual patch will be a tar file containing the following files:

Filename:                 README.patch.2315

Algorithm #1 (sum -r):    25011 11 README.patch.2315

Algorithm #2 (sum):       39892 11 README.patch.2315

MD5 checksum:             9B5B74574022FEE0259307C44A4602C0

Filename:                 patchSG0002315

Algorithm #1 (sum -r):    44474 2 patchSG0002315

Algorithm #2 (sum):       48055 2 patchSG0002315

MD5 checksum:             0C9FA667D42B3FC6895C5AD612CE4FB1

Filename:                 patchSG0002315.idb

Algorithm #1 (sum -r):    27036 3 patchSG0002315.idb

Algorithm #2 (sum):       23448 3 patchSG0002315.idb

MD5 checksum:             3DEEA538437CC5D96488269715948F31

Filename:                 patchSG0002315.outbox_sw

Algorithm #1 (sum -r):    38552 35 patchSG0002315.outbox_sw

Algorithm #2 (sum):       34937 35 patchSG0002315.outbox_sw

MD5 checksum:             0655A31A55306B4272FD00796CF69466

Filename:                 README.patch.2314

Algorithm #1 (sum -r):    10949 11 README.patch.2314

Algorithm #2 (sum):       39885 11 README.patch.2314

MD5 checksum:             E2BFB467EF18F1D5B5CDCE5FBDC3F36D

Filename:                 patchSG0002314

Algorithm #1 (sum -r):    18667 2 patchSG0002314

Algorithm #2 (sum):       51210 2 patchSG0002314

MD5 checksum:             FE7C82E22CD63CC278C011FE80F3265A

Filename:                 patchSG0002314.idb

Algorithm #1 (sum -r):    23116 3 patchSG0002314.idb

Algorithm #2 (sum):       23091 3 patchSG0002314.idb

MD5 checksum:             CB3E71D4FB3D86192E15EE59AED8A296

Filename:                 patchSG0002314.outbox_sw

Algorithm #1 (sum -r):    56643 35 patchSG0002314.outbox_sw

Algorithm #2 (sum):       28391 35 patchSG0002314.outbox_sw

MD5 checksum:             5CC76625AB89FF2862EB21111E7924F0

Filename:                 README.patch.2338

Algorithm #1 (sum -r):    39046 13 README.patch.2338

Algorithm #2 (sum):       48961 13 README.patch.2338

MD5 checksum:             D568381EF9948399D50663C2CB9175E8

Filename:                 patchSG0002338

Algorithm #1 (sum -r):    41914 3 patchSG0002338

Algorithm #2 (sum):       15225 3 patchSG0002338

MD5 checksum:             18845B0651DC6CCED5E92694915DB36D

Filename:                 patchSG0002338.idb

Algorithm #1 (sum -r):    32107 4 patchSG0002338.idb

Algorithm #2 (sum):       19674 4 patchSG0002338.idb

MD5 checksum:             351DFB48864622C3B8219CC88526F5BE

Filename:                 patchSG0002338.outbox_sw

Algorithm #1 (sum -r):    36841 107 patchSG0002338.outbox_sw

Algorithm #2 (sum):       12878 107 patchSG0002338.outbox_sw

MD5 checksum:             2269AB01C700BB39E1CCF1849FAC70AF

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

- - --- Acknowledgments ---

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

Silicon Graphics wishes to thank the CERT Coordination Center, and

AUSCERT for their assistance in this matter.

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

- - --- Silicon Graphics Inc. Security Information/Contacts ---

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

If there are questions about this document, email can be sent to



Silicon Graphics 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 information and patches

is sgigate.sgi.com (  Security information and patches

are located under the directories ~ftp/security and ~ftp/patches,

respectively. The Silicon Graphics Security Headquarters Web page is

accessible at the URL http://www.sgi.com/Support/security/security.html.

For issues with the patches on the FTP sites, email can be sent to


For assistance obtaining or working with security patches, please

contact your SGI support provider.


Silicon Graphics 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 



In the example above,  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.


Silicon Graphics provides a comprehensive customer World Wide Web site.

This site is located at http://www.sgi.com/Support/security/security.html.


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, Silicon

  Graphics is appropriately credited and the document retains and

  includes its valid PGP signature.


Version: 2.6.2







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