Tomcat Cgi

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Having trouble enabling the CGI mode in your Apache Tomcat? Check out this tutorial to learn more!

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When running on Windows with enableCmdLineArguments enabled, the CGI Servlet in Apache Tomcat 9.0.0.M1 to 9.0.17, 8.5.0 to 8.5.39 and 7.0.0 to 7.0.93 is vulnerable to Remote Code Execution due to a bug in the way the JRE passes command line arguments to Windows. The CGI Servlet is disabled by default. I've set up CGI in Tomcat and it runs fine for one of my test scripts. Now I am trying a more sophisticated script which uses DBD/Oracle.pm and it's throwing me the following errors when I inspect. CVE-2019-0232: When running on Windows with enableCmdLineArguments enabled, the CGI Servlet in Apache Tomcat 9.0.0.M1 to 9.0.17, 8.5.0 to 8.5.39 and 7.0.0 to 7.0.93 is vulnerable to Remote Code Execution due to a bug in the way the JRE passes command line arguments to Windows. The CGI Servlet is disabled by default. The CGI option enableCmdLineArguments is disable by default in Tomcat 9.0.x. The Apache Tomcat ® software is an open source implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies. The Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket specifications are developed under the Java Community Process. The Apache Tomcat software is developed in an open and participatory environment. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that.

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Hello Coders, I hope you are all doing well.

Today, I had to enable the CGI mode in Tomcat, while facing lots of issue in the same. So, I thought that, after successful deployment, I would write an article in the same simplified steps. Here it is!

Tomcat Chip And Dale

  • First, download the Apache Tomcat (choose the version that is compatible with your application; in my case, I am using the latest one).
  • Go to the CATALINA_HOME/conf and modify the following files:
    • web.xml (Here, we will enable the CGI support in Tomcat)
      • To enable CGI support in Tomcat, we have to uncomment servlet and servlet-mapping of CGI servlet in web.xml.
      • After uncommenting the servlet and servlet-mapping of CGI, we have to add one param value in that servlet mapping to execute our CGI.
    • context.xml
      • We have to set the attribute 'privileged' to true for Context.



  • Go to the CATALINA_HOME/webapps/ROOT/ directory.
    • Check weather WEB-INF directory is exist or not, if not create the directory WEB-INF.
    • Create another directory named as cgi under WEB-INF.
  • Now, your Tomcat is CGI enabled. You can copy any CGI file under this directory, and it will run successfully.
  • Your base URL will be <<request protocol>>>://<<server-ip>>:<<server-port>>/cgi-bin/<<name of cgi>>, in my case i.e. http://localhost:8080/cgi-bin/test.cgi
  • For more understanding, you can look for CGI-howto section in Tomcat

Let me know if you face any issue after this deployment. Happy Coding!

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