From rich.boren@hp.com Fri Aug 27 21:28:56 2004 From: "Boren, Rich (SSRT)" To: bugtraq@securityfocus.com Date: Wed, 25 Aug 2004 11:38:06 -0600 Subject: [security bulletin] SSRT4779 - rev.0 HP-UX Netscape NSS Library Suite SSLv2 remote buffer overflow -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 SUPPORT: For further information, contact HP Services support channel. SUBSCRIBE: To initiate a subscription to receive future HP Security Bulletins via Email: http://h30046.www3.hp.com/driverAlertProfile.php?regioncode =NA&langcode=USENG&jumpid=in_SC-GEN__driverITRC&topiccode=ITRC On the web page: Driver and Support Alerts/Notifications Sign-up: Product Selection Under Step1: your products 1. Select product category: - a minimum of servers must be selected. 2. Select product family or search: - a minimum of one product must be selected. 3. Add a product: - a minimum of one product must be added. In Step 2: your operating system(s) - check ALL operating systems for which alerts are required. Complete the form and Save. To update an existing subscription: http://h30046.www3.hp.com/subSignIn.php Log in on the web page Subscriber's choice for Business: sign-in. On the Web page: Subscriber's Choice: your profile summary - use Edit Profile to update appropriate sections. Note: In addition to the individual alerts/notifications for the selected operating systems/products, subscribers will automatically receive one copy of alerts for non-operating system categories (i.e., a subscriber who signs up for all six operating system alerts will only receive one copy of all the non-operating system alerts). 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@hp.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@hp.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. -----BEGIN PGP SIGNATURE----- Version: PGP 8.0.2 iQA/AwUBQSzL5+AfOvwtKn1ZEQIi7QCg6GuR+hGcfc65UoPX5ZdwsUySgHkAn3xG wfG1I9BgLHdKOU3YO5L9zlRq =o2Iu -----END PGP SIGNATURE-----