Cyber Security Web Application Attacks

🌐 Cyber Security Web Application Attacks (In-Depth & Practical View)

 What are Web Application Attacks?

Web application attacks exploit flaws in application logic, input handling, authentication, or configuration to:

• Steal data

• Take over accounts

• Execute code

• Disrupt services

📌 Most attacks happen at OSI Layer 7 (Application Layer).

 OWASP & Industry Standard

The global standard reference for web risks is maintained by OWASP.
Their OWASP Top 10 lists the most critical web vulnerabilities.

 Major Web Application Attacks (Explained)

1️⃣ SQL Injection (SQLi)

What happens: Malicious SQL is injected via inputs (login forms, search boxes).

Impact

• Read/modify database

• Bypass login

• Delete data

Defense

• Prepared statements

• Parameterized queries

• Input validation

2️⃣ Cross-Site Scripting (XSS)

What happens: Attacker injects malicious JavaScript that runs in the victim’s browser.

Types

• Stored XSS

• Reflected XSS

• DOM-based XSS

Impact

• Session theft

• Defacement

• Phishing

Defense

• Output encoding

• Content Security Policy (CSP)

3️⃣ Cross-Site Request Forgery (CSRF)

What happens: Victim’s browser is tricked into sending an unwanted request.

Impact

• Unauthorized actions (change email, transfer funds)

Defense

• CSRF tokens

• SameSite cookies

4️⃣ Broken Authentication

What happens: Weak login/session handling.

Examples

• Weak passwords

• Predictable session IDs

• No MFA

Impact

• Account takeover

Defense

• Strong password policy

• MFA

• Secure session management

5️⃣ Broken Access Control

What happens: Users access resources they shouldn’t.

Examples

• Viewing other users’ data

• Admin pages accessible to normal users

Defense

• Server-side authorization checks

• Role-Based Access Control (RBAC)

6️⃣ Security Misconfiguration

What happens: Unsafe default settings.

Examples

• Default credentials

• Open admin panels

• Debug mode enabled

Defense

• Secure configuration

• Remove unused features

7️⃣ Sensitive Data Exposure

What happens: Data sent or stored without encryption.

Impact

• Data leaks

• Privacy violations

Defense

• HTTPS (TLS)

• Encryption at rest & in transit

8️⃣ File Upload Vulnerabilities

What happens: Malicious files uploaded (e.g., web shells).

Impact

• Remote code execution

• Server takeover

Defense

• File type validation

• Rename files

• Store outside web root

9️⃣ Server-Side Request Forgery (SSRF)

What happens: Attacker forces server to make internal requests.

Impact

• Internal network access

• Cloud metadata theft

Defense

• URL allowlists

• Network restrictions

🔟 Insecure APIs

What happens: APIs lack proper auth, rate limits, or validation.

Impact

• Data scraping

• Account takeover

Defense

• API authentication (OAuth, tokens)

• Rate limiting

• Input validation

 Other Common Web Attacks

 Attack Lifecycle (How Attacks Happen)

1️⃣ Recon (find inputs & endpoints)
2️⃣ Inject payloads
3️⃣ Bypass controls
4️⃣ Exploit vulnerability
5️⃣ Steal data / control system

📌 Most attacks start with user input fields.

🛡 How to Defend Web Applications

🔐 Technical Controls

• Web Application Firewall (WAF)

• Secure coding standards

• Input validation & output encoding

• HTTPS everywhere

• Proper error handling

👨‍💻 Process Controls

• Code reviews

• Security testing (SAST/DAST)

• Regular patching

• Bug bounty programs

🔧 Common Tools (Awareness)

• Burp Suite

• OWASP ZAP

• Nikto

• SQLmap

• Nuclei

⚠️ Use only on systems you own or have permission to test.

🎯 Career Importance (Very High 🔥)

Knowledge of web attacks is essential for:

• Ethical Hackers

• Penetration Testers

• Bug Bounty Hunters

• SOC Analysts

• Web Developers

📌 Most bug bounties = web application vulnerabilities

🧠 Key Takeaways

✔ Web apps are the most attacked assets
✔ OWASP Top 10 is mandatory knowledge
✔ Input validation is critical
✔ WAF + secure coding = strong defense

🌐 Every input is a potential attack vector