search menu icon-carat-right cmu-wordmark

CERT Coordination Center

BEA WebLogic Server fails to properly validate certificate chains

Vulnerability Note VU#566390

Original Release Date: 2004-04-22 | Last Revised: 2004-04-22


There is a vulnerability in BEA WebLogic Server in which certificate chains rejected by the custom trust manager could still be accepted by the server.


BEA Systems describes WebLogic Server as "an industrial-strength application infrastructure for developing, integrating, securing, and managing distributed Java applications." The WebLogic Server allows for the configuration of custom trust managers. This feature provides the ability to override certain validation errors when evaluating a client's certificate. There is a vulnerability in the way the WebLogic server validates certificate chains that could allow a remote attacker to impersonate a user or remote server.

According to the BEA Security 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 BEA Security Advisory states that the following versions of WebLogic Server and 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


A remote attacker could impersonate a user or remote server.


WebLogic Server and WebLogic Express version 8.1
1. Upgrade to WebLogic Server and WebLogic Express version 8.1 Service Pack 2.

2. Install the patch from:

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.

Vendor Information


BEA Systems Inc. Affected

Updated:  April 22, 2004



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Please refer to BEA Security Advisory BEA04-054.00.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector



This vulnerability was reported by BEA Systems Inc.

This document was written by Damon Morda.

Other Information

CVE IDs: None
Severity Metric: 5.20
Date Public: 2004-04-14
Date First Published: 2004-04-22
Date Last Updated: 2004-04-22 19:13 UTC
Document Revision: 19

Sponsored by CISA.