hacktricks/network-services-pentesting/8009-pentesting-apache-jserv-protocol-ajp.md

8009 - Pentesting Apache JServ Protocol (AJP)

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Basic Information

From https://diablohorn.com/2011/10/19/8009-the-forgotten-tomcat-port/

AJP is a wire protocol. It an optimized version of the HTTP protocol to allow a standalone web server such as Apache to talk to Tomcat. Historically, Apache has been much faster than Tomcat at serving static content. The idea is to let Apache serve the static content when possible, but proxy the request to Tomcat for Tomcat related content.

Also interesting:

The ajp13 protocol is packet-oriented. A binary format was presumably chosen over the more readable plain text for reasons of performance. The web server communicates with the servlet container over TCP connections. To cut down on the expensive process of socket creation, the web server will attempt to maintain persistent TCP connections to the servlet container, and to reuse a connection for multiple request/response cycles

Default port: 8009

PORT     STATE SERVICE
8009/tcp open  ajp13

CVE-2020-1938 'Ghostcat'

This is an LFI vuln which allows to get some files like WEB-INF/web.xml which contains credentials. This is an exploit to abuse the vulnerability and AJP exposed ports might be vulnerable to it.

The patched versions are at or above 9.0.31, 8.5.51, and 7.0.100.

Enumeration

Automatic

nmap -sV --script ajp-auth,ajp-headers,ajp-methods,ajp-request -n -p 8009 <IP>

Brute force

AJP Proxy

Nginx Reverse Proxy + AJP

(Checkout the Dockerized version)

It's possible to communicate with an open AJP proxy port (8009 TCP) by using the Nginx ajp_module apache module and access the Tomat Manager from this port which could ultimately lead to RCE in the vulnerable server.

• Start downloading Nginx from https://nginx.org/en/download.html and then compile it with the ajp module:

# Compile Nginx with the ajp module
git clone https://github.com/dvershinin/nginx_ajp_module.git
cd nginx-version
sudo apt install libpcre3-dev
./configure --add-module=`pwd`/../nginx_ajp_module --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules
make
sudo make install
nginx -V

• Then, comment the server block and add the following in the http block in /etc/nginx/conf/nginx.conf.

upstream tomcats {
	server <TARGET_SERVER>:8009;
	keepalive 10;
	}
server {
	listen 80;
	location / {
		ajp_keep_conn on;
		ajp_pass tomcats;
	}
}

• Finally, start nginx (sudo nginx) and check it works by accessing http://127.0.0.1

Nginx Dockerized-version

git clone https://github.com/ScribblerCoder/nginx-ajp-docker
cd nginx-ajp-docker

Replace TARGET-IP in nginx.conf witg AJP IP then build and run

docker build . -t nginx-ajp-proxy
docker run -it --rm -p 80:80 nginx-ajp-proxy

Apache AJP Proxy

It's also possible to use an Apache AJP proxy to access that port instead of Nginx.

References

• https://github.com/yaoweibin/nginx_ajp_module

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