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Web Security
Learn about web application security, HTTPS, SSL/TLS, and common web vulnerabilities.
Common Web Vulnerabilities
Cross-Site Scripting (XSS)
Types:
- • Reflected XSS
- • Stored XSS
- • DOM-based XSS
Impact:
Session hijacking, data theft, malicious redirects
Prevention:
- • Input validation and sanitization
- • Output encoding
- • Content Security Policy (CSP)
- • Use secure frameworks
Example:
<script>alert('XSS')</script>SSL/TLS Certificate Analyzer
Certificate Information
Domain:example.com
Issuer:Let's Encrypt Authority X3
Valid From:2024-01-01
Valid To:2024-12-31
Algorithm:RSA 2048-bit
Status:Valid
Security Headers Checker
Content-Security-Policy
default-src 'self'
Present
X-Frame-Options
DENY
Present
X-XSS-Protection
1; mode=block
Missing
Strict-Transport-Security
max-age=31536000
Present
X-Content-Type-Options
nosniff
Present
Security Score
4/5
SSL/TLS Protocol Versions
| Version | Year | Status | Security Level | Known Issues |
|---|---|---|---|---|
| SSL 2.0 | 1995 | Deprecated | Insecure |
|
| SSL 3.0 | 1996 | Deprecated | Insecure |
|
| TLS 1.0 | 1999 | Deprecated | Weak |
|
| TLS 1.1 | 2006 | Deprecated | Weak |
|
| TLS 1.2 | 2008 | Current | Secure |
|
| TLS 1.3 | 2018 | Current | Most Secure |
|
Web Security Best Practices
Authentication & Authorization
- ✓Implement strong password policies
- ✓Use multi-factor authentication (MFA)
- ✓Apply principle of least privilege
- ✓Regular access reviews
- ✓Session timeout mechanisms
Data Protection
- ✓Encrypt data in transit and at rest
- ✓Use HTTPS everywhere
- ✓Implement proper key management
- ✓Data classification and handling
- ✓Secure backup procedures
Input Validation
- ✓Validate all user inputs
- ✓Use whitelist validation
- ✓Encode output data
- ✓Implement file upload restrictions
- ✓Sanitize database queries
Security Headers
- ✓Content Security Policy (CSP)
- ✓HTTP Strict Transport Security (HSTS)
- ✓X-Frame-Options
- ✓X-Content-Type-Options
- ✓Referrer Policy