Security Advisories and Notifications

Security Advisory: (BEA04-62.00)

From: Oracle Corporation

Minor Subject: A remedy is available to prevent unexpected user identity

Product(s) Affected: WebLogic Server and WebLogic Express

Threat level: Low
This vulnerability requires a single client JVM to log into WebLogic Server more than once using RMI over the IIOP protocol.

Severity: Low
There is the potential one user could execute an RMI method under the wrong identity

Recently 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 below.

I. Advisory

This vulnerability can occur when a client logs into WebLogic Server multiple times as different users. The documentation describes the behavior of the client when RMI requests are made when there is no current user associated with the client's thread. While correct for RMI over T3, this description is incorrect for RMI over the IIOP protocol and any client that relied on the documented behavior may get an unexpected user identity in an RMI call.

The remedy below updates the documentation to address this vulnerability.

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

  • WebLogic Server and WebLogic Express 8.1, on all platforms
  • WebLogic Server and WebLogic Express 7.0, on all platforms
  • WebLogic Server and WebLogic Express 6.1, on all platforms


Oracle strongly recommends the following course of actions:


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 Specific lockdown information is provided at 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:

Additional users who wish to register for product advisory distribution should follow the registration directions at:

Security issues can be reported to Oracle by following the directions at:

Thank you,
Oracle Corporation