# 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:** Go

- Prevalence: 高 频繁被利用
- Impact: 高 3 条严重级别为高的规则
- Prevention: 已记录 3 个修复示例

**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

基于 1 条 Shoulder 检测规则的 LDAP Injection 预防策略。

### Go

Use ldap.EscapeFilter to sanitize user input in LDAP queries

## Warning Signs

- [HIGH] user input flowing to LDAP queries without proper escaping

## Consequences

- 读取应用程序数据
- 修改应用程序数据
- 绕过保护机制

## Mitigations

- 尽可能使用参数化的 LDAP 查询
- 对 LDAP 查询中使用的所有用户输入进行转义或编码
- 根据可接受字符的允许列表对输入进行验证

## Detection

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

## Rules by Language

### Go (1 rules)

- **LDAP Injection** [HIGH]: Detects user input flowing to LDAP queries without proper escaping.
  - Remediation: Use ldap.EscapeFilter to sanitize user input before including in LDAP filters.

```go
escaped := ldap.EscapeFilter(username)
filter := fmt.Sprintf("(uid=%s)", escaped)
```

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