Date: Wed, 25 Aug 2004 11:38:06 -0600
From: "Boren, Rich (SSRT)" <rich.boren@...com>
To: <bugtraq@...urityfocus.com>
Subject: [security bulletin] SSRT4779 - rev.0 HP-UX Netscape NSS Library Suite SSLv2 remote buffer overflow



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 HP SECURITY BULLETIN

 HPSBUX01070     REVISION: 0

 SSRT4779 HP-UX Netscape NSS Library Suite SSLv2
               remote buffer overflow

 -----------------------------------------------------------------
 NOTICE:
 There are no restrictions for distribution of this Bulletin
 provided that it remains complete and intact.

 The information in this Security bulletin should be acted upon
 as soon as possible.

 INITIAL RELEASE:    23 August 2004


 POTENTIAL SECURITY IMPACT:  Remote buffer overflow and
 arbitrary code execution

 SOURCE:  HEWLETT-PACKARD COMPANY
               HP Software Security Response Team


 REFERENCES:    http://xforce.iss.net/xforce/alerts/id/180


 VULNERABILITY SUMMARY:
 A potential security vulnerability has been identified with
 Network Security Services (NSS) library suite using SSLv2 ciphers
 running on HP-UX.  A buffer overflow could be exploited remotely
 to execute arbitrary code or create a Denial of Service against
 products or services that implement vulnerable versions of the
 NSS library.


 SUPPORTED SOFTWARE VERSIONS*:  ONLY impacted versions
 are listed.

 Any application or product that integrates the NSS library suite
 and which implements SSLv2 ciphers may be affected.
 Netscape - Directory Server (NDS) - currently supported versions,
 Netscape - Administration Server (AS) - currently supported
 versions.

 BACKGROUND:
 Internet Security Systems, Inc. (ISS) has reported buffer
 overflow vulnerabilities in all known releases of the Network
 Security Services (NSS) library suite.

    http://xforce.iss.net/xforce/alerts/id/180

 AFFECTED VERSIONS

 Note: To determine if a system has an affected version,
      search the output of "swlist -a revision -l fileset"
      for an affected fileset.  Then determine if the
      recommended patch or update is installed.

 HP-UX B.11.23
 HP-UX B.11.11
 HP-UX B.11.00
 =============
 For versions NDS  6.02, and 6.11 with AS 6.01 and 6.1
 NetscapeDirSvr6.NDS-SLAPD
 NetscapeDirSvr6.NDS-ADM
 action: follow procedure described in the Resolution section.

 For version NDS 4.16 with AS 4.2
 NscapeDir40SrvUS.DirectoryServer
 NscapeDir40SrvUS.AdminServer
 action: upgrade to NDS 6.11.

 END AFFECTED VERSIONS


 NOTE: If still using NDS version 4.16 HP recommends upgrading
      to version 6.11 or subsequent and following the
      recommendations herein.

 This bulletin will be updated when a new NDS release is
available.


 RESOLUTION:
 Disabling all SSLv2 cipher suites effectively mitigates these
vulnerabilities.

 NOTE: Simply disabling SSLv2 does not fully protect against
      attack.  All SSLv2 cipher suites must be disabled explicitly
      in order to perform this mitigation.

 Instructions for disabling the SSLv2 cipher suites for Netscape
 Directory Server (NDS) and Administration Server (AS) are
 provided below.

 A. Netscape Directory Server (NDS)

 These changes apply to Netscape Directory Server versions
 6.02 and 6.11.

 1. Stop NDS.
 2. Open the
    /var/opt/netscape/servers/slapd-{instance}/config/dse.ldif
    file in an editor.
 3. DisablealloftheSSLv2ciphersinthe"dn:cn=encryption,cn=config"
    entry.
    To accomplish this, add the following to the comma separated
    list of ciphers in the "nsSSL3ciphers" attribute:
                -rc4
                -rc4export
                -rc2
                -rc2export
                -des
                -desede3

 It is important to include the minus sign before each cipher when
 modifying the "nsSSL3ciphers" to negate the attribute in order to
 tell Netscape Directory Server not to support those ciphers.

 For example, the nsSSL3ciphers attribute with the correct
 ciphers disabled:

 nsSSL3Ciphers:
 -rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc4_40_md5,+rsa_rc2_40_md5,
 +rsa_des_sha,+rsa_fips_des_sha,+rsa_3des_sha,+rsa_fips_3des_sha,
 +fortezza,+fortezza_rc4_128_sha,+fortezza_null,
 +tls_rsa_export1024_with_rc4_56_sha,
 +tls_rsa_export1024_with_des_cbc_sha,
 -rc4,-rc4export,-rc2,-rc2export,-des,-desede3

 3. Start NDS.

 NOTE: If modification of cipher preferences is performed through
       the Directory Server Console, any previous entries added
       manually will be lost, and the process of modifying the
       dse.ldif file will be required again.

 B. Administration Server (AS)

 To disable SSLv2 via the admin server console:
 1.  Login to admin server console
 2.  Select the Administration Server
 3.  Select the Configuration tab
 4.  Select the Encryption Tab
 5.  Click the Cipher Settings button
 6.  Uncheck all ciphers in the SSL 2.0 tab
 7.  Click Ok, then Save
 8.  Restart the server

 To disable SSLv2 manually via the configuration files:
 1. Stop the server.

 2. Edit /var/opt/netscape/servers/admin-serv/config/server.xml
    a. In the SSLPARAMS element there is an SSLv2 attribute.
       Set this to "off".
    b. To also disable all of the SSLv2 ciphers, replace "+" with
       "-" in the ssl2ciphers attribute for all of the ciphers
       listed.

 An example follows:
  ssl2ciphers="-rc4,-rc4export,-rc2,-rc2export,
  -des,-desede3" ssl3="on"
  ssl3tlsciphers="+rsa_rc4_128_md5,+rsa_3des_sha,+rsa_des_sha,
  +rsa_rc4_40_md5,+rsa_rc2_40_md5,-rsa_null_md5"

 3. Edit /var/opt/netscape/servers/admin-serv/config/local.conf
    a. In the configuration.encryption.nsSSL2 attribute,
       set the value to "off".
    b. To also disable all of the SSLv2 ciphers, replace "+" with
      "-" in the configuration.encryption.nsSSL2Ciphers attribute
      for all of the ciphers listed.

 An example follows:
  configuration.encryption.nsSSL2: off
  configuration.encryption.nsSSL3: on
  configuration.encryption.nsSSL2Ciphers: -desede3,-des,-rc4,-rc2,
  -rc4export,-rc2export
  configuration.encryption.nsSSL3Ciphers: +fips_3des_sha,
  +rsa_des_sha,-rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc2_40_md5,
  +fips_des_sha,+rsa_rc4_40_md5,+rsa_3des_sha

 4. Start the server


 MANUAL ACTIONS:  Yes - NonUpdate
 For Netscape Directory Server (NDS) 4.16 upgrade to 6.11 and
 follow the procedure in the Resolution section of this bulletin.

 For Netscape Directory Server (NDS) 6.02 and 6.11 follow the
 procedure in the Resolution section of this bulletin.

 For Administration Server (AS) 4.2 upgrade to 6.01 or 6.1 and
 follow the procedure in the Resolution section of this bulletin.

 For Administration Server (AS) 6.01 and 6.1 follow the
 procedure in the Resolution section of this bulletin.


 BULLETIN REVISION HISTORY:
 Revision 0   19 August 2004
    Initial release


 * The software product category that this Security Bulletin
  relates to is represented by the 5th and 6th characters of the
  Bulletin number: GN=General, MA=Management Agents,
  MI=Misc. 3rd party, MP=HP-MPE/iX, NS=HP NonStop Servers,
  OV=HP OpenVMS, PI=HP Printing & Imaging, ST=HP Storage,
  TU=HP Tru64 UNIX, TL=Trusted Linux, UX=HP-UX, VV=Virtual Vault


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 HP-UX SPECIFIC SECURITY BULLETINS*:
 The HP-UX Security Patch Matrix is available here:
   http://itrc.hp.com/service/cki/docDisplay.do?
   docId=hpuxSecurityMatrix
 Or via anonymous ftp:
   ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/

 The HP-UX Security Patch Matrix, updated daily, categorizes
 security patches by platform/OS release, and by Bulletin topic.
 The Security Patch Check tool completely automates the process of
 reviewing the Security Patch Matrix for HP-UX 11.XX Versions.

 NOTE: Installing patches listed in the Security Patch Matrix will
 completely implement the RESOLUTION in the Security Bulletin
 _only_ if there are no MANUAL ACTIONS included.

 The Security Patch Check tool can also verify that a Security
 Bulletin RESOLUTION has been implemented on HP-UX 11.XX Versions
 provided that no MANUAL ACTIONS were included. The Security Patch
 Check tool cannot verify patches implemented via product upgrade.

 For information on the Security Patch Check tool, see:
   http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
   displayProductInfo.pl?productNumber=B6834AA

REPORT: To report a potential security vulnerability with any HP
supported product, send Email to: security-alert@...com. It is
strongly recommended that security related information being
communicated to HP be encrypted using PGP, especially exploit
information. To obtain the security-alert PGP key please send an
e-mail message to security-alert@...com with the Subject of
'get key' (no quotes).

System management and security procedures must be reviewed
frequently to maintain system integrity. HP is continually
reviewing and enhancing the security features of software products
to provide customers with current secure solutions.

"HP is broadly distributing this Security Bulletin in order to
bring to the attention of users of the affected HP products the
important security information contained in this Bulletin. HP
recommends that all users determine the applicability of this
information to their individual situations and take appropriate
action. HP does not warrant that this information is necessarily
accurate or complete for all user situations and, consequently,
HP will not be responsible for any damages resulting from user's
use or disregard of the information provided in this Bulletin.
To the extent permitted by law, HP disclaims all warranties,
either express or implied, including the warranties of
merchantability and fitness for a particular purpose, title
and non-infringement."

(c)Copyright 2004 Hewlett-Packard Development Company, L.P.
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
provided is provided "as is" without warranty of any kind. To the
extent permitted by law, neither HP or its affiliates,
subcontractors or suppliers will be liable for incidental, special
or consequential damages including downtime cost; lost profits;
damages relating to the procurement of substitute products or
services; or damages for loss of data, or software restoration.
The information in this document is subject to change without
notice. Hewlett-Packard Company and the names of Hewlett-Packard
products referenced herein are trademarks of Hewlett-Packard
Company in the United States and other countries. Other product
and company names mentioned herein may be trademarks of their
respective owners.

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