# Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') (CWE-90)

The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query.

**Stack:** Python

- Prevalence: Alta Frecuentemente explotada
- Impact: Alto 3 reglas de severidad alta
- Prevention: Documentada 3 ejemplos de corrección

**OWASP:** Injection (A03:2021-Injection) - #3

## Description

If user input is incorporated into an LDAP query without proper sanitization, an attacker can inject LDAP commands that could read or modify sensitive directory information.

## Prevention

Estrategias de prevención para LDAP Injection basadas en 1 reglas de detección de Shoulder.

### Python

Escape LDAP special characters using escape_filter_chars() before constructing filters

## Warning Signs

- [HIGH] LDAP queries constructed with unsanitized user input

## Consequences

- Leer datos de la aplicación
- Modificar datos de la aplicación
- Eludir mecanismo de protección

## Mitigations

- Usa consultas LDAP parametrizadas siempre que sea posible
- Escapa o codifica toda la entrada del usuario usada en consultas LDAP
- Valida la entrada contra una lista de permitidos de caracteres aceptables

## Detection

- Total rules: 3
- Languages: go, javascript, typescript, python

## Rules by Language

### Python (1 rules)

- **LDAP Injection** [HIGH]: Detects LDAP queries constructed with unsanitized user input.
  - Remediation: Escape LDAP special characters using escape_filter_chars().

```python
from ldap3.utils.conv import escape_filter_chars
safe_username = escape_filter_chars(username)
```

Learn more: https://shoulder.dev/learn/python/cwe-90/ldap-injection