LDAP Injection Template

Executive Summary:

This report addresses a critical security vulnerability known as LDAP Injection within our application. LDAP Injection occurs when untrusted user input is improperly sanitized or validated before being used in LDAP (Lightweight Directory Access Protocol) queries, allowing attackers to manipulate queries and potentially execute unauthorized LDAP commands. This report aims to detail the vulnerability, its potential impact on our systems and users, and actionable recommendations for mitigation.

Description of the Vulnerability:

LDAP Injection vulnerabilities arise when applications construct LDAP queries dynamically using user-supplied input without proper validation or sanitization. Attackers can exploit these vulnerabilities to inject malicious LDAP payloads, such as filters or commands, into the queries, leading to unauthorized access, data disclosure, or server compromise. Common examples include search filters, authentication mechanisms, or user profile lookups vulnerable to injection attacks.


The impact of LDAP Injection vulnerabilities can be severe, leading to various security risks, including unauthorized access to sensitive information, data disclosure, or LDAP server compromise. Attackers can exploit LDAP Injection vulnerabilities to manipulate query results, escalate privileges, or perform reconnaissance to facilitate further attacks, potentially leading to financial loss, reputational damage, or legal consequences.


The likelihood of exploitation depends on various factors, including the visibility of LDAP integration points, the effectiveness of input validation, and the attacker's knowledge of LDAP query syntax. However, given the prevalence of LDAP Injection vulnerabilities in web applications and the potential impact on system security, the risk associated with this vulnerability is significant if not properly mitigated.

Steps to Reproduce:

  1. Identify functionalities within the application that interact with LDAP servers, such as user authentication, user profile management, or directory lookups.
  2. Manipulate input parameters or form fields to inject LDAP payloads, such as search filters, into the LDAP queries sent by the application.
  3. Monitor the LDAP queries generated by the application and observe if the injected payloads are executed or processed without proper validation.
  4. Analyze the query results or application responses to determine if unauthorized access or data disclosure occurs as a result of the injection attacks.

Recommendations for Developers:

  1. Use Parameterized Queries: Use parameterized queries or prepared statements to construct LDAP queries dynamically, ensuring that user input is properly sanitized and encoded to prevent injection attacks.
  2. Implement Input Validation: Implement strict input validation and sanitization mechanisms to validate and filter user-supplied input before using it in LDAP queries, preventing malicious payloads from being injected.


Addressing the LDAP Injection vulnerability is critical to protecting the integrity and confidentiality of LDAP data, maintaining secure authentication mechanisms, and preventing unauthorized access within our application. By implementing parameterized queries and input validation mechanisms, we can mitigate the risks associated with LDAP Injection vulnerabilities and enhance the overall security posture of our systems.