- by x32x01 ||
LDAP Injection & Blind LDAP Injection - High-Level Awareness & Defense 
LDAP injection occurs when untrusted input is embedded into LDAP queries (used for directories, auth, or user lookups), allowing attackers to manipulate query logic. Blind LDAP injection is a stealthier variant where the app doesn’t return directory errors or data - attackers infer results via behavior or timing differences. Both are dangerous because they can expose user records, bypass auth checks, or escalate access if abused.
How it looks (high-level signs):
Common indicators include unexpected directory queries in logs, spikes of strange or repetitive search parameters, unusual latency on lookup endpoints (possible timing probes), and authentication anomalies. Apps that swallow LDAP errors and always return generic responses are particularly susceptible to “blind” techniques that rely on side channels (timing, boolean responses) rather than visible error messages. 
Defensive checklist (must-do):
Never build LDAP filters by concatenating raw user input. Use safe APIs / parameterized LDAP queries or dedicated libraries that perform proper escaping. Apply strict server-side input validation / allowlists, enforce least-privilege for directory accounts, enable LDAP over TLS, and centralize & monitor LDAP logs (audit searches, large result sets, and unusual bind activity). Add WAF rules and anomaly detection for excessive or patterned directory queries. Rotate service credentials and limit which services can perform sensitive directory operations. 
Detection & testing (authorized):
Detect blind patterns by monitoring for repeated similar requests with small input variations and by alerting on unusual response-time profiles. Any testing or simulation should be done only in staging/lab environments or with explicit written permission — never probe production systems without authorization. 
