AUSCERT External Security Bulletin Redistribution

     SSRT3622 Potential Security Vulnerabilities in Apache HTTP Server
                              03 October 2003


        AusCERT Security Bulletin Summary

Product:                OpenSSL
Publisher:              Hewlett-Packard
Operating System:       HP-UX release 11.23
                        HP-UX release 11.22
                        HP-UX release 11.20
                        HP-UX release 11.11
                        HP-UX release 11.00
Impact:                 Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0543, CAN-2003-0544, CAN-2003-0545

Ref:                    AL-2003.18

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Hash: SHA1

Originally issued: 01 Oct 2003
SSRT3622 Potential Security Vulnerabilities in Apache HTTP Server
NOTICE: There are no restrictions for distribution of this
        Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible.  Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.

PROBLEM: 1. Certain ASN.1 encodings that are rejected as invalid
            by the parser can trigger a bug in the deallocation
            of the corresponding data structure, corrupting the
            stack.  This can be used as a denial of service
            attack.  It is currently unknown whether this can be
            exploited to run malicious code. This issue does not
            affect OpenSSL 0.9.6.

            More details are available at:

         2. Unusual ASN.1 tag values can cause an out of bounds
            read under certain circumstances, resulting in a
            denial of service vulnerability.
            More details are available at:

         3. A malformed public key in a certificate will crash
            the verify code if it is set to ignore public key
            decoding errors.  Exploitation of an affected
            application would result in a denial of service

         4. Due to an error in the SSL/TLS protocol handling,
            a server will parse a client certificate when one is
            not specifically requested.

IMPACT:   Potential Denial of Service

PLATFORM: HP9000 Servers running HP-UX release B.11.00, B.11.11,
          B.11.20, B.11.22, and B.11.23 with versions of the
          following products are affected, and represented as:
          product-name, version (product-tag/bundle-tag)

          - hp apache-based web server, or earlier
            This product includes OpenSSL 0.9.6b.

          - hp-ux apache-based web server, v. or earlier
            This product includes OpenSSL 0.9.6i.

          - hp apache-based web server, (with IPv6
            support), or earlier (HPApache/B9416BA)
            This product includes OpenSSL 0.9.6b.

          - hp-ux apache-based web server(with IPv6 support),
            v. or earlier (hpuxwsAPACHE/hpuxwsApache)
            This product includes OpenSSL 0.9.6i.

SOLUTION: For HP-UX releases B.11.00, B.11.11, B.11.20,
          B.11.22, and B.11.23 download new HP Apache product
          from the ftp site (see below for details).

          For HPApache/B9416AA, HPApache/B9416BA and
              hpuxwsAPACHE/hpuxwsApache download the following:

          - hp-ux apache-based web server (with IPv4)
            A. or later (hpuxwsAPACHE/hpuxwsApache)
            This product includes OpenSSL 0.9.7b + patches.

          - hp-ux apache-based web server(with IPv6 support),
            B. or later (hpuxwsAPACHE/hpuxwsApache)
            This product includes OpenSSL 0.9.7b + patches.

                Install the product containing the fix.
        For customers with HPApache/B9416AA HPApache/B9416BA
        installed, the fix requires removing the affected
        products from the system and migration to

AVAILABILITY: Complete product bundles are available from
              the ftp site (see below for details).

A. Background
   An SSL/TLS testing suite developed by the NISCC (National
   Infrastructure Security Co-Ordination Centre in the UK) has
   identified ASN.1 parsing vulnerabilities in OpenSSL.

   The Common Vulnerabilities and Exposures project
   <http://cve.mitre.org/> has identified potential
   vulnerabilities in the Apache HTTP Server (CAN-2003-0543,


     The affected filesets are: (product.fileset)

     For IPv4:
     HP-UX B.11.00
     HP-UX B.11.11
     HP-UX B.11.22
     fix: revision A. or subsequent

     For IPv6:
     HP-UX B.11.11
     HP-UX B.11.23
     fix: revision B. or subsequent


B. Recommended solution
   For customers using HPApache/B9416BA and hpuxwsAPACHE/
   hpuxwsApache, HP has incorporated OpenSSL 0.9.7b + patches
   in the following product:

   - hp-ux apache-based web server version or later

        System:    hprc.external.hp.com  (
        Login:     apache1
        Password:  apache1

        FTP Access: ftp://apache1:apache1@hprc.external.hp.com/
                or: ftp://apache1:apache1@
                or: ftp hprc.external.hp.com

        Note: There is an ftp defect in IE5 that may result in
               a browser hang.  To work around this:
        - Select Tools -> Internet Options -> Advanced
        - Un-check the option:
                  [ ] Enable folder view for FTP sites

    To fix the problem:

    1. Determine the affected version.
    2. Download and verify the cksum or md5 sum.
    3. Install the appropriate Apache depot.

          2820606652 77844480   A.
          84183799 91555840     A.
          774435972 77875200    B.
          871663669 116940800   B.


   Check for Apache Installation
   To determine if the Apache web server from HP is installed on
   your system, use Software Distributor's swlist command.  All
   three versions products may co-exist on a single system.

   For example, the results of the command
     swlist -l product | grep -i apache     might show:

     HPApache  HP Apache-based Web Server
     hpuxwsAPACHE  A.   HP-UX Apache-based Web Server

   Stop Apache
   Before updating, make sure to stop any previous Apache binary.
   Otherwise, the previous binary will continue running,
   preventing the new one from starting, although the
   installation would be successful.

   After determining which Apache is installed, stop Apache with
   the following commands:

     for HPApache:        /opt/hpapache2/bin/apachectl stop
     for hpuxwsAPACHE:    /opt/hpws/apache/bin/apachectl stop

   Download and Install Apache
   - Download Apache from temporary ftp site using the previously
     mentioned links.
   - Verify successful download by comparing the cksum/md5 with
     the value specified on the installation web page.
   - Use SD to swinstall the depot.
   - For customers with HPApache/B9416BA installed, migrate to
     hpuxwsAPACHE/hpuxwsApache and remove the affected products
     from the system.

   Installation of this new version of HP Apache over an existing
   HP Apache installation is supported, while installation over a
   non-HP Apache is NOT supported.

   Removing Apache Installation
   If you rather remove Apache from your system than install a
   newer version to resolve the security problem, use both
   Software Distributor's "swremove" command and also "rm -rf"
   the home location as specified in the rc.config.d file "HOME"

   To find the files containing HOME variables in the
   /etc/rc.config.d directory:

     %ls /etc/rc.config.d | grep apache

C. To subscribe to automatically receive future NEW HP Security
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   NOTE: Using your itrc account security bulletins can be
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   To -gain access- to the Security Patch Matrix, select
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   For information on the Security Patch Check tool, see:

   The security patch matrix is also available via anonymous


   On the "Support Information Digest Main" page:
   click on the "HP Security Bulletin Archive".

   The PGP key used to sign this bulletin is available from
   several PGP Public Key servers.  The key identification
   information is:

      HP Security Response Team (Security Bulletin signing only)
      Fingerprint =
        6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

   If you have problems locating the key please write to
   security-alert@hp.com.  Please note that this key is
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D. To report new security vulnerabilities, send email to


   Please encrypt any exploit information using the
   security-alert PGP key, available from your local key
   server, or by sending a message with a -subject- (not body)
   of 'get key' (no quotes) to security-alert@hp.com.


(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company.  Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.

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Version: PGP 8.0


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