OWASP Top 10: Web Application Security Masterclass

94% of web applications contain at least one OWASP Top 10 vulnerability (Verizon 2023 DBIR). This tutorial covers exploitation techniques, real-world case studies, and professional remediation strategies for each critical risk.

OWASP Vulnerability Prevalence (2023)

Broken Access (34%)

Cryptographic Failures (23%)

Injection (20%)

Other (23%)

1. Injection Vulnerabilities

Types:

SQLi: Database command injection
OS Command: Shell command execution
LDAP: Directory service manipulation

Enterprise Case:

2017 Equifax breach (CVE-2017-5638) exposed 143M records via SQLi

2. Broken Authentication

Attack Vectors:

Credential Stuffing: Reused password databases
Session Fixation: Cookie manipulation
Weak 2FA: SMS/email bypass

Testing Methods:

Burp Suite Intruder for brute force
OWASP ZAP for session analysis
Custom wordlists with Crunch

Remediation:

Implement passwordless auth (WebAuthn) and rate limiting

3. Sensitive Data Exposure

Common Failures:

Clear-text Storage: Unencrypted databases
Weak Algorithms: MD5, SHA1 hashing
Improper Headers: Missing HSTS/CSP

GDPR Impact:

Fines up to 4% of global revenue for PII exposure

4. XML External Entities (XXE)

Exploitation Methods:

File Disclosure: Extract /etc/passwd
SSRF: Internal network scanning
DoS: Billion laughs attack

Enterprise Impact:

2017 PayPal XXE vulnerability allowed internal system access

OWASP Top 10 Quick Reference

Rank	Vulnerability	Test Tool	Remediation
A01	Broken Access	Burp Suite	RBAC Implementation
A02	Cryptographic Failures	testssl.sh	TLS 1.2+ Enforcement
A03	Injection	SQLmap	Prepared Statements

5. Emerging Web Threats

API Security

Broken object level authorization

Tool: Postman, Burp Suite

Web3 Vulnerabilities

Smart contract reentrancy

Solution: Slither, MythX

Serverless Attacks

Event injection in Lambda

Defense: Input validation

Web App Hardening Checklist

Implement WAF (ModSecurity, Cloudflare)

Conduct DAST/SAST scans weekly

Enforce CSP headers

Train developers on secure coding

Chief Security Architect Insight: The 2023 OWASP Benchmark shows applications with regular security testing reduce vulnerabilities by 78%. Effective web security requires both automated scanning (DAST/SAST) and manual penetration testing for business logic flaws.

0 Interaction

0 Views

0 Likes