Security Advisories and Notifications

Security Advisory: (BEA05-82.00)

From: Oracle Corporation

Minor Subject: Denial of Service attack.

Product(s) Affected: WebLogic Server and WebLogic Express

Threat level: High
A knowledgeable user can remotely attack the server.

Severity: High
Successfully exploiting the attack can make a WebLogic Server instance unusable.

A problem was identified that could potentially cause a security vulnerability in certain versions of WebLogic Server. This problem can be corrected with an upgrade (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

All sites are susceptible to this vulnerability.

A specific remote buffer overflow attack can cause thread looping resulting in high CPU utilization that could be used as a denial-of-service attack on the server.

The upgrade resolves the issue by changing the input processing so that the threads no longer loop.

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

  • WebLogic Server and WebLogic Express 6.1 Service Pack 4, on all platforms.


Oracle strongly recommends the following course of actions.

WebLogic Server and WebLogic Express version 6.1
  1. Upgrade to WebLogic Server (or Express) 6.1 Service Pack 5 or later.


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