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   UNIRAS (UK Govt CERT) Briefing Notice - 572/03 dated 15.10.03  Time: 11:00
 UNIRAS is part of NISCC(National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Potential Security Vulnerabilities in Apache HTTP Server (rev.01).

Potential denial of service attack.

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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.

**REVISED 01**
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 <http://software.hp.com>.

          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

**REVISED 01**
AVAILABILITY: Complete product bundles are available from
- - - -->>          <http://software.hp.com>.

CHANGE SUMMARY:  Rev.01 temporary ftp site removed
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


**REVISED 01**
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
- - - -->> <http://www.software.hp.com/portal/swdepot/
- - - -->>      displayProductInfo.do?productNumber=HPUXWSATW100901

    To fix the problem:

    1. Determine the affected version.

   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 <http://software.hp.com> (see above).
    - 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
   Bulletins from the HP IT Resource Center via electronic
   mail, do the following:

   Use your browser to get to the HP IT Resource Center page


   Use the 'Login' tab at the left side of the screen to login
   using your ID and password.  Use your existing login or the
   "Register" button at the left to create a login, in order to
   gain access to many areas of the ITRC.  Remember to save the
   User ID assigned to you, and your password.

   In the left most frame select "Maintenance and Support".

   Under the "Notifications" section (near the bottom of
   the page), select "Support Information Digests".

   To -subscribe- to future HP Security Bulletins or other
   Technical Digests, click the check box (in the left column)
   for the appropriate digest and then click the "Update
   Subscriptions" button at the bottom of the page.


   To -review- bulletins already released, select the link
   (in the middle column) for the appropriate digest.

   NOTE: Using your itrc account security bulletins can be
         found here:

   To -gain access- to the Security Patch Matrix, select
   the link for "The Security Bulletins Archive".  (near the
   bottom of the page)  Once in the archive the third link is
   to the current Security Patch Matrix. Updated daily, this
   matrix categorizes security patches by platform/OS release,
   and by bulletin topic.  Security Patch Check completely
   automates the process of reviewing the patch matrix for
   11.XX systems.  Please note that installing the patches
   listed in the Security Patch Matrix will completely
   implement a security bulletin _only_ if the MANUAL ACTIONS
   field specifies "No."

   The Security Patch Check tool can verify that a security
   bulletin has been implemented on HP-UX 11.XX systems providing
   that the fix is completely implemented in a patch with no
   manual actions required.  The Security Patch Check tool cannot
   verify fixes implemented via a product upgrade.

   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@xxxxxxx  Please note that this key is
   for signing bulletins only and is not the key returned
   by sending 'get key' to security-alert@xxxxxxx

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@xxxxxxx

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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via EMail to:

Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 20 7821 1330 Ext 4511
Fax: +44 (0) 20 7821 1686

Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 20 7821 1330 and follow the prompts

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UNIRAS wishes to acknowledge the contributions of Hewlett Packard for the information
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>
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