Security Advisories and Notifications


Subject: Security Advisory (BEA07-176.00)
From: Oracle Corporation
Minor Subject: Server may select a cipher suite that uses a null cipher for SSL communication with SSL clients
Product(s) Affected: WebLogic Server and WebLogic Express

Threat level: Medium
An attacker could obtain and exploit information that is not encrypted when a null cipher suite is in use.

Severity: Medium
An attacker may be able to perform unauthorized operations with the information obtained.

A problem was identified that could potentially cause a security vulnerability in certain versions of WebLogic Server. A patch is available to correct this problem (see Section II). Oracle treats potential security problems with a high degree of urgency and endeavors to take appropriate steps to help ensure the security of our customers' systems. As a result, Oracle strongly suggests the following actions:

I. Read the following advisory.
II. Apply the suggested action.
III. If you know of any additional users interested in future security advisories, please forward them the registration instructions included in this advisory.

I. Advisory

Under certain circumstances, when a client does not offer support for any of the cipher suites available in the server, then the server may select a cipher suite that uses a null cipher; this may result in SSL communication that is not encrypted.

This advisory corrects this issue by logging a message when null cipher is in use and also provides administrators the ability to disable the use of null ciphers during SSL communications with SSL clients.

Impact and CVSS Ratings:

CVSS Severity Score: 5.9 (Medium)
Attack Range (AV): Remote
Attack Complexity (AC): Low
Level of Authentication Needed (Au): Not Required
Impact Type: Unauthorized access to sensitive information appearing in clear text
Vulnerability Type: Elevation of privilege, Access Validation
CVSS Base Score Vector: (AV:R/AC:L/Au:NR/C:P/I:P/A:N/B:C)

Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
Online Calculator: http://nvd.nist.gov/cvss.cfm?calculator

The following versions of WebLogic Server and WebLogic Express are affected by this vulnerability

  • WebLogic Server 10.0 on all platforms
  • WebLogic Server 9.2 released through Maintenance Pack 1, on all platforms
  • WebLogic Server 9.1 on all platforms
  • WebLogic Server 9.0 on all platforms
  • WebLogic Server 8.1 released through Service Pack 6, on all platforms
  • WebLogic Server 7.0 released through Service Pack 7, on all platforms

II. SUGGESTED ACTION

Oracle strongly recommends the following course of actions.

WebLogic Server 10.0

Use the Smart Update tool to install the 10.0 patch for CR325828.

WebLogic Server 9.2

Upgrade to WebLogic Server and WebLogic Express 9.2 Maintenance Pack 2.

WebLogic Server 9.1

Use the Smart Update tool to install the 9.1 patch for CR325828.

WebLogic Server 9.0

  1. Download and apply the 9.0 GA Combo patch #7824963 from OracleMetaLink as per the instructions below:
    • Select the Patches and Updates tab after logging in to OracleMetaLink.
    • Click Simple Search.
    • In the Search By field, select Patch Number from the list.
    • Enter the patch number. The patch number may be different for different product releases and platforms.
    • Select the platform (or choose generic as applicable)
    • Click Go.
    • Click Download to download the patch.
  2. Download and apply the patch #7824432 from OracleMetaLink as per the instructions below:
    • Select the Patches and Updates tab after logging in to OracleMetaLink.
    • Click Simple Search.
    • In the Search By field, select Patch Number from the list.
    • Enter the patch number. The patch number may be different for different product releases and platforms.
    • Select the platform (or choose generic as applicable)
    • Click Go.
    • Click Download to download the patch
  3. Place the jar for the patch at the end of the PATCH_CLASSPATH.

WebLogic Server and WebLogic Express version 8.1

  1. Upgrade to WebLogic Server and WebLogic Express 8.1 Service Pack 6.
  2. Download and apply the patch #7824425 from OracleMetaLink as per the instructions below:
    • Select the Patches and Updates tab after logging in to OracleMetaLink.
    • Click Simple Search.
    • In the Search By field, select Patch Number from the list.
    • Enter the patch number. The patch number may be different for different product releases and platforms.
    • Select the platform (or choose generic as applicable)
    • Click Go.
    • Click Download to download the patch.
  3. Place the jar for the patch in the CLASSPATH before the weblogic.jar file.

WebLogic Server and WebLogic Express version 7.0

  1. Upgrade to WebLogic Server and WebLogic Express 7.0 Service Pack 7.
  2. Download and apply the patch #7824416 from OracleMetaLink as per the instructions below:
    • Select the Patches and Updates tab after logging in to OracleMetaLink.
    • Click Simple Search.
    • In the Search By field, select Patch Number from the list.
    • Enter the patch number. The patch number may be different for different product releases and platforms.
    • Select the platform (or choose generic as applicable)
    • Click Go.
    • Click Download to download the patch.
  3. Place the jar for the patch in the CLASSPATH before the weblogic.jar file.

Note: To disable the use of null cipher, the following system property can be set:

"-Dweblogic.security.disableNullCipher=true"
Note that if this property is set, no message will be output and null ciphers will never be used.

If this property is set and if an SSL client presents a ciphersuite list that has only null-ciphered suites in its initial connection, the server will throw an exception, java.security.NoSuchAlgorithmException. This exception will be logged to the server log if SSL debugging is enabled. The client will receive this as an SSL Alert, with Severity FATAL, Type: 40. (A type '40' is the SSL error, HANDSHAKE_FAILURE).



SECURITY COMMUNICATIONS

Oracle strongly suggests that customers apply the remedies recommended in all our security advisories. Oracle also urges customers to apply every Service/Maintenance Pack as they are released. Service/Maintenance Packs include a roll-up of all bug fixes for each version of the product, as well as each of the prior Service/Maintenance Packs. Service/Maintenance Packs and information about them can be found at: http://www.oracle.com/technology/software/products/ias/bea_main.html

Note: Information about securing WebLogic Server and WebLogic Express can be found at http://edocs.bea.com/wls/docs103/security.html. Specific lockdown information is provided at http://e-docs.bea.com/wls/docs103/lockdown/index.html. We strongly encourage you to review this documentation to ensure your server deployment is securely configured.

As a policy, if there are any security-related issues with any Oracle product, Oracle will distribute an advisory and instructions with the appropriate course of action. Because the security of your site, data, and code is our highest priority, we are committed to communicating all security-related issues clearly and openly.

All previous advisories can be viewed at: http://www.oracle.com/technology/deploy/security/wls-security.

Additional users who wish to register for product advisory distribution should follow the registration directions at: http://www.oracle.com/technology/deploy/security/alerts.htm.

Security issues can be reported to Oracle by following the directions at: http://www.oracle.com/technology/deploy/security/alerts.htm.

Thank you,
Oracle Corporation