Introduction

Injection attacks remain one of the most critical and exploited vulnerabilities in web applications. Whether it’s SQL Injection, Command Injection, or LDAP Injection, the core weakness is the same: untrusted input being passed directly into interpreters without proper validation or sanitization.

At CyberDudeBivash, we consider injection attacks as cybercriminals’ favorite weapons — enabling everything from data theft and privilege escalation to complete system compromise.

 Types of Injection

1. SQL Injection (SQLi)

   • Attacker manipulates database queries by injecting malicious SQL.

   • Example:

     SELECT * FROM users WHERE username = 'admin' OR '1'='1';
     

2. Command Injection

   • Injecting system-level commands into an application.

   • Example:

     ping -c 4 127.0.0.1; rm -rf /  
     

3. LDAP Injection

   • Manipulating LDAP queries to gain unauthorized access.

   • Example:

     (&(uid=*)(userPassword=*))  
     

4. NoSQL / JSON Injection

   • Exploiting MongoDB/NoSQL queries by passing malicious JSON payloads.

 Real-World Impact

• Massive Data Breaches → Extraction of customer records, financial data, PII.

• Account Takeovers (ATO) → Attackers bypass authentication.

• Remote Code Execution (RCE) → Through command injection.

• Regulatory Penalties → GDPR, HIPAA, PCI DSS violations.

 Detection & Threat Hunting

Indicators of Injection Exploitation

• Abnormal query execution patterns.

• Logs showing ' OR '1'='1 or other payloads.

• Excessive database errors (e.g., “syntax error near …”).

Threat Hunting Query (SIEM Example)

index=web_logs
| search "' OR '1'='1" OR "UNION SELECT" OR "xp_cmdshell" OR "(&(uid="
| stats count by src_ip, uri, user

 Defense Strategies

1. Parameterized Queries (Prepared Statements)

   • Prevents injection by separating SQL code from user input.

2. Input Validation & Sanitization

   • Reject unexpected characters (', ;, {}, etc.).

3. Stored Procedures (with caution)

   • Avoid dynamic SQL queries inside procedures.

4. Least Privilege Database Accounts

   • Ensure apps can only access necessary data — not admin-level.

5. Web Application Firewalls (WAF)

   • Block known injection payloads in real-time.

6. Continuous Testing

   • Integrate SAST/DAST tools in CI/CD pipelines.

   • Perform regular penetration testing for injection flaws.

 MITRE ATT&CK Mapping

• T1190 – Exploit Public-Facing Application

• T1505 – Server-Side Injection

• T1059 – Command & Scripting Interpreter

 Lessons Learned

• Injection remains one of the oldest yet most effective cyberattacks.

• A single unvalidated input can compromise an entire enterprise.

• Proactive validation, parameterization, and security testing are non-negotiable for defense.

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