AUSCERT External Security Bulletin Redistribution

                   ESB-2002.632 -- SGI Security Advisory
                      Apache Security Vulnerabilities
                             13 November 2002


        AusCERT Security Bulletin Summary

Product:                Apache prior to 1.3.27
Vendor:                 SGI
Operating System:       IRIX prior to 6.5.19
Impact:                 Root Compromise
Access Required:        Remote

Ref:                    ESB-2002.550

- --------------------------BEGIN INCLUDED TEXT--------------------


                          SGI Security Advisory

Title    : Apache Security Vulnerabilities
Number   : 20021105-01-I
Date     : November 12, 2002
Reference: CVE CAN-2002-0843, CAN-2002-0839, CAN-2002-0840
Reference: SGI BUG 869356
Fixed in : sgi_apache-1.3.27-BETA "patch" found on
Fixed in : ftp://patches.sgi.com/support/free/security/beta/apache-1.3.27/
Fixed in : sgi_apache v1.3.27 on IRIX 6.5.19 Apps CD

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

It's been reported that Apache versions prior to 1.3.27 have the following

    o  Buffer overflows in ab utility

       Buffer overflows in the benchmarking utility ab can be exploited if
       ab is run against a malicious server

    o  Shared memory permissions lead to local privilege escalation

       The permissions of the shared memory used for the scoreboard allows
       an attacker who can execute under the Apache UID to send a signal to
       any process as root or cause a local denial of service attack.

    o  Error page XSS using wildcard DNS CAN-2002-0840

       Cross-site scripting (XSS) vulnerability in the default error page of
       Apache 2.0 before 2.0.43, and 1.3.x up to 1.3.26, when
       UseCanonicalName is "Off" and support for wildcard DNS is present,
       allows remote attackers to execute script as other web page visitors
       via the Host: header.

See: http://www.apacheweek.com/features/security-13 for further details.

These vulnerabilities were assigned the following CVEs:

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 will be corrected in future releases of IRIX.

- - --------------
- - --- Impact ---
- - --------------

The Apache webserver is supplied with IRIX versions since 6.5.12m/f as a
replacement for the older SGI FastTrack server.  It is installed by default,
and is enabled through "chkconfig" by default.

In order to determine if the Apache webserver is installed, execute the
following command:

  # versions -b | grep apache

  If the following line is returned you are OK (ignore the date):

  I  sgi_apache       11/15/2002  SGI Web Server based on Apache, 1.3.27

  If any earlier version is shown you are vulnerable.

These vulnerabilities might lead to a root compromise in some
configurations, and no local account is required.

These vulnerabilities have been reported by CVE and have been publicly
discussed in Usenet newsgroups and mailing lists.

To determine the version of IRIX you are running, execute the following

  # /bin/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.

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

SGI acknowledges that it may not always be possible to immediately install
patches or upgrade the operating system.  In those cases, we recommend
removing the Apache webserver and associated products by using the following

  # versions remove sgi_apache\*
  # versions remove websetup\*
  # versions remove gateway\*

It is not necessary to reboot the system after doing this.  You should
follow the recommendations in the "Temporary Solution" section below as soon
as it is possible to do so.

- - --------------------------
- - --- Temporary Solution ---
- - --------------------------

SGI is working on providing a new Apache version.  In the interim, we have
provided a BETA copy of Apache which should address the security matter. Our
recommendation is to upgrade to IRIX 6.5.19 when available and install the
Apache version on the Applications CD, or install the distribution from the
ftp site noted below.

   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 3 & 4
   IRIX 6.5.15       yes                       Notes 3 & 4
   IRIX 6.5.16       yes                       Notes 3 & 4
   IRIX 6.5.17       yes                       Notes 3 & 4
   IRIX 6.5.18       yes                       Notes 3 & 4
   IRIX 6.5.19       no


   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

   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 6.5.19 when released and install the Apache
      distribution from the Applications CD

   4) Install the Apache distribution located at:
      Please note that this version will not be supported on Irix versions
      prior to 6.5.14.

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

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

Filename:                 sgi_apache
Algorithm #1 (sum -r):    11059 5 sgi_apache
Algorithm #2 (sum):       39872 5 sgi_apache
MD5 checksum:             C83DA535714AC4D157BD884695902D2D

Filename:                 sgi_apache.books
Algorithm #1 (sum -r):    53491 3334 sgi_apache.books
Algorithm #2 (sum):       3618 3334 sgi_apache.books
MD5 checksum:             68457FA5B900979136B14A6F7C9A9F35

Filename:                 sgi_apache.idb
Algorithm #1 (sum -r):    58058 284 sgi_apache.idb
Algorithm #2 (sum):       58597 284 sgi_apache.idb
MD5 checksum:             41584996C3CBD440540C941EA9B95F4E

Filename:                 sgi_apache.man
Algorithm #1 (sum -r):    08314 98 sgi_apache.man
Algorithm #2 (sum):       35168 98 sgi_apache.man
MD5 checksum:             AA095B6BC2F1C6A62FD4A81E4021E641

Filename:                 sgi_apache.src
Algorithm #1 (sum -r):    09105 6412 sgi_apache.src
Algorithm #2 (sum):       33444 6412 sgi_apache.src
MD5 checksum:             3C0D14E5185FA0E871DC8507C689C5A9

Filename:                 sgi_apache.sw
Algorithm #1 (sum -r):    34276 1858 sgi_apache.sw
Algorithm #2 (sum):       13640 1858 sgi_apache.sw
MD5 checksum:             2BB483DDED4DD1CC05FCEE3667A9B75F

- - ------------------------
- - --- Acknowledgments ----
- - ------------------------

SGI wishes to thank iDefense, Matthew Murphy, David Wagner, FIRST and the
users of the Internet Community at large for their assistance in this

- - -------------
- - --- Links ---
- - -------------

SGI Security Advisories can be found at:
http://www.sgi.com/support/security/ and

SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and

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:

SGI fixes for SGI open sourced code can be found on:

SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or

SGI patches for Windows NT or 2000 can be found at:

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:

IRIX 6.5 Software Update CDs can be obtained from:

The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (  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


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 (  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:

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.


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 such as aaanalyst@sgi.com >

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.


SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/support/security/ .


If there are general security questions on SGI systems, email can be sent to

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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