From: Oracle Corporation
Minor Subject: Patches available to prevent user impersonation.
Product(s) Affected: WebLogic Server and WebLogic Express
Threat level: Medium
A remote attacker, when 2-way SSL is used with a custom trust manager, might be able to exploit this vulnerability.
A successful attacker could impersonate a system administrator or a remote server.
A problem was identified that could potentially cause a security vulnerability in certain versions of WebLogic Server and WebLogic Express. Patches are available to correct this problem (see Section II). BEA System treats potential security problems with the highest degree of urgency and does everything possible to ensure the security of all customer assets. 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.
This vulnerability affects sites using custom trust managers. This vulnerability can occur when WebLogic Server is validating a certificate chain. It occurs under the following circumstances:
- During an inbound 2-way SSL request (when the user's certificate is validated).
- During an outbound SSL request (when the remote server's certificate chain is validated).
If a certificate chain is validated and accepted but the custom trust manager rejects the chain, the certificate chain may still be accepted. This circumstance allows an attacker using two-way SSL to impersonate a user. When outbound SSL is being used, an attacker can impersonate a remote server.
The following versions of WebLogic Server and WebLogic Express are affected by this vulnerability
- WebLogic Server and WebLogic Express 8.1 released through Service Pack 2, on all platforms
- WebLogic Server and WebLogic Express 7.0 released through Service Pack 4, on all platforms
II. SUGGESTED ACTION
Oracle strongly recommends the following course of actions:
Oracle strongly recommends the following course of actions.
WebLogic Server and WebLogic Express version 8.1
1. Upgrade to WebLogic Server and WebLogic Express version 8.1 Service Pack 2.
2. Download and apply the patch #7823648 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.
WebLogic Server version 8.1 Service Pack 3 is also supported with this patch.
WebLogic Server and WebLogic Express version 7.0
1. Upgrade to WebLogic Server and WebLogic Express version 7.0 Service Pack 5.
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:
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: