Security Advisories and Notifications

Security Advisory: (BEA05-79.00)

From: Oracle Corporation

Minor Subject: Incorrect cookie data may impact cluster performance.

Product(s) Affected: WebLogic Server and WebLogic Express

Threat level: High
A remote client may pass incorrect host and port information in a cookie.

Severity: High
Cluster performance may decrease as attempts are made to contact the incorrect host and port, thereby accomplishing a successful denial of service attack.

A problem was identified that could potentially cause a security vulnerability in certain versions of WebLogic Server. An upgrade 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.
This vulnerability occurs in both WebLogic Server and WebLogic Express. Subsequent references in this advisory to WebLogic Server are intended to encompass both products.

I. Advisory

Sites running clusters are susceptible to this vulnerability. The cluster cookie parsing code attempts to contact any host and port in the cookie whether or not the host, port pair is a member of a cluster. If a cookie with an invalid host and port is received, it may lead to a cluster slowdown as attempts are made to contact the invalid host and port. This can lead to a successful denial-of-service attack.

The following versions of WebLogic Server are affected by this vulnerability
  • WebLogic Server 7.0 through Service Pack 5, on all platforms


Oracle strongly recommends the following course of actions:

WebLogic Server 7.0
Upgrade to WebLogic Server 7.0 Service Pack 6


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