Oracle WebLogic Remote Code Execution via IIOP
Description
Oracle WebLogic Server versions prior to the January 2020 Critical Patch Update contain a critical vulnerability (CVE-2020-2551) in the WLS Core Components that allows unsafe deserialization of Java objects via the IIOP protocol. This flaw enables unauthenticated remote attackers to send specially crafted serialized Java objects to the server, which are processed without proper validation. Successful exploitation allows attackers to execute arbitrary code with the privileges of the WebLogic Server process, potentially leading to complete system compromise.
Remediation
Take the following steps to remediate this vulnerability:
1. Apply Security Patches (Recommended)
Upgrade Oracle WebLogic Server to a version that includes the January 2020 Critical Patch Update or later. Refer to Oracle's Critical Patch Update Advisory for specific patch numbers applicable to your WebLogic version.
2. Disable IIOP Protocol (If Not Required)
If your application does not require IIOP/T3 protocols, disable them in the WebLogic Server configuration:
• Navigate to the WebLogic Administration Console • Go to Environment > Servers > [Your Server] • Click on the 'Protocols' tab • Under 'IIOP', uncheck 'Enable IIOP' • Save and restart the server
3. Restrict Network Access
If IIOP must remain enabled, implement network-level controls:
• Configure firewall rules to restrict IIOP port access to trusted IP addresses only
• Place WebLogic servers behind a properly configured application firewall
• Ensure IIOP ports are not exposed to the internet
4. Verify Remediation
After applying patches or mitigations, rescan your environment to confirm the vulnerability has been resolved.