WebLogic T3/IIOP Information Disclosure Vulnerability (CVE-2024-21006/CVE-2024-21007)

WebLogic T3/IIOP Information Disclosure Vulnerability (CVE-2024-21006/CVE-2024-21007)

abril 18, 2024 | NSFOCUS


Recently, NSFOCUS CERT detected that Oracle has released a security announcement and fixed two information disclosure vulnerabilities (CVE-2024-21006/CVE-2024-21007) in Oracle WebLogic Server. Due to the defects of T3/IIOP protocol, unauthenticated attackers can send malicious requests through servers affected by T3/IIOP protocol. Access to sensitive information on the target system. Affected users should take measures for protection as soon as possible.

Reference link:


Scope of Impact

Affected Version

  • WebLogic Server
  • WebLogic Server

Note: The above is the product version that Oracle officially supports maintenance at present, and multiple old versions of WebLogic Server such as, and have stopped maintenance.


Local detection

Users can run the following command to check whether the WebLogic version and patch have been installed.

$ cd /Oracle/Middleware/wlserver_10.3/server/lib

$ java -cp weblogic.jar   weblogic.version

If no patch installation information is displayed in the output, a risk exists, as shown in the following figure.

T3 protocol detection

The Nmap tool provides a scanning script for the WebLogic T3 protocol to detect WebLogic hosts that enable the T3 service. The command is as follows:

nmap -n -v -Pn –sV [host or network segment address] -p7001,7002 –script=weblogic-t3-info.nse

As shown in the red mark of the following figure, the target has enabled T3 protocol and WebLogic version is within the affected range. If relevant personnel do not install official security patches, there will be a vulnerability risk.


Patch update

At present, Oracle has released patches to fix the above vulnerabilities. Please refer to the official notice to download the updated patch of the affected product in time, and install the update by referring to the readme file in the patch installation package to ensure long-term effective protection. Download link: https://support.oracle.com/rs?type=doc&id=3011291.2

Temporary Measures

If the user cannot install the update patch temporarily, take the following measures for temporary protection:

Restrict T3 protocol access

Users can temporarily block attacks that exploit T3 protocol vulnerabilities by controlling access to the T3 protocol. WebLogic Server provides a default connection filter named weblogic.security.net.ConnectionFilterImpl, which accepts all incoming connections. Access control can be performed on T3 and T3s protocols through the configuration rules of this connection filter. The detailed operation steps are as follows:

1. Go to the WebLogic console. On the configuration page of base_domain, go to the Security tab page and click Filters to configure connection filters.

2. Enter weblogic.security.net.ConnectionFilterImpl in the connection filter, and configure rules conforming to the actual situation of the enterprise in the connection filter rule by referring to the following writing: * * allow t3 t3s

Local IP ** allow t3 t3s

IP allowed to be accessed  * * allow t3 t3s  

* * * deny t3 t3s

The connection filter rule format is as follows: target localAddress localPort action protocols, where:

  • target specifies one or more servers to filter.
  • localAddress can be used to define the host address of the server. (If an asterisk (*) is specified, the returned match will be all local IP addresses.)
  • localPort defines the port on which the server is listening. (If an asterisk is specified, the match will return all available ports on the server).
  • action specifies the operation to be performed. (Value must be “allow” or “deny”.)
  • Protocols is a list of protocol names to be matched. (Must specify one of the following protocols: http, https, t3, t3s, giop, giops, dcom or ftp. If no protocol is defined, all protocols will match one rule.

3. If the rule does not take effect after saving, it is recommended to restart the WebLogic service (restarting the WebLogic service will cause business interruption. It is recommended that relevant personnel assess the risk before proceeding).

Taking the Windows environment as an example, the steps to restart the service are as follows:

Enter the bin directory under the directory where the domain is located, run stopWebLogic.cmd file in Windows system to terminate WebLogic service, and run stopWebLogic.sh file in Linux system.

After the termination script is executed, run the startWebLogic.cmd or startWebLogic.sh file to start WebLogic to restart the WebLogic service.

Disable IIOP Protocol

Users can block attacks that exploit IIOP protocol vulnerabilities by disabling the IIOP protocol as follows:

In the WebLogic console, choose Service > AdminServer > Protocol and uncheck Enable IIOP.

Restart the WebLogic project to make the configuration take effect.


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