mirror of
https://github.com/danog/psalm.git
synced 2024-12-02 09:37:59 +01:00
33 lines
1023 B
Markdown
33 lines
1023 B
Markdown
|
# TaintedLdap
|
||
|
|
|
||
|
|
Potential LDAP injection. This rule is emitted when user-controlled input can be passed into a LDAP request.
|
||
|
|
|
||
|
|
## Risk
|
||
|
|
|
||
|
|
Passing untrusted user input to LDAP requests could be dangerous.
|
||
|
|
|
||
|
|
If LDAP requests like these are used for login purposes, it could result in an authentication bypass. An attacker could write a filter that would evaluate to `true` for any user, and thus bruteforce credentials easily.
|
||
|
|
|
||
|
|
|
||
|
|
## Example
|
||
|
|
|
||
|
|
```php
|
||
|
|
<?php
|
||
|
|
|
||
|
|
$ds = ldap_connect('example.com');
|
||
|
|
$dn = 'o=Psalm, c=US';
|
||
|
|
$filter = $_GET['filter']);
|
||
|
|
ldap_search($ds, $dn, $filter, []);
|
||
|
|
```
|
||
|
|
|
||
|
|
## Mitigations
|
||
|
|
|
||
|
|
Use [`ldap_escape`](https://www.php.net/manual/en/function.ldap-escape.php) to escape user input to the LDAP filter and DN.
|
||
|
|
|
||
|
|
|
||
|
|
## Further resources
|
||
|
|
|
||
|
|
- [OWASP Wiki for LDAP Injections](https://owasp.org/www-community/attacks/LDAP_Injection)
|
||
|
|
- [LDAP Injection Prevention Cheatsheet](https://cheatsheetseries.owasp.org/cheatsheets/LDAP_Injection_Prevention_Cheat_Sheet.html)
|
||
|
|
- [CWE-90](https://cwe.mitre.org/data/definitions/90.html)
|