Security Advisories and Notifications

Security Advisory: (BEA03-27.00)

From: Oracle Corporation

Subject: SECURITY ADVISORY (BEA03-27.00)

Minor Subject: Remedy available to prevent access to a web application without re-authentication

Product(s) Affected: WebLogic Server and Express

Threat Level: Low

Severity: Low

Recently a problem was identified that could potentially cause a security vulnerability in certain versions of WebLogic Server and Express. A Service Pack is available to correct the problem (see section II below). BEA treats such possibilities with the highest degree of urgency and does everything possible to ensure the security of all customer assets. As a result, we strongly suggest the following action:

     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 an application that contains a web application component using "memory" session persistence is redeployed without rebooting the server. When this occurs, users who have logged into the web application prior to its redeployment can sometimes access the web application without needing to authenticate again even if they are accessing the application long after their last access. Only systems that use web applications, "memory" session persistence and dynamic redeployment (ie: redeploy without a reboot) are vulnerable to this problem.

The following versions of WebLogic Server and Express are affected by this vulnerability
  • Version: WebLogic Server 7.0 released or WebLogic Server on all platforms


Oracle strongly recommends the following course of actions:
  • WebLogic Server 7.0 released or WebLogic Server
    • Apply WebLogic Server 7.0 Service Pack 2


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