Security assessment: webapp01 ASP.NET Core application

[Copilot]

Comprehensive security assessment of webapp01 identifies 15 vulnerabilities requiring remediation before production deployment.

Assessment Scope

• Source code analysis (C#, Razor Pages, configuration)
• Dependency vulnerability scanning (NuGet packages)
• OWASP Top 10 2021 compliance mapping
• Secrets detection and authentication review

Findings Summary

Risk Level: 🔴 HIGH RISK (not production-ready)

Severity	Count	Key Issues
Critical	3	Hardcoded DB credentials, exposed Azure Storage key, default password in code
High	5	2 vulnerable dependencies (CVEs), command injection, ReDoS, log injection
Medium	4	Missing auth/authz, no security headers, insecure deserialization
Low	3	Missing CSRF validation, permissive AllowedHosts, no rate limiting

OWASP Top 10 Compliance: 10% (1/10 pass)

Critical Vulnerabilities

// DevSecOps.cshtml.cs:15 - Hardcoded database credentials
private const string CONNECTION_STRING = "Server=localhost;Database=TestDB;User Id=admin;Password=SecretPassword123!;";

// Index.cshtml.cs:11 - Hardcoded default password  
public const string DEFAULT_PASSWORD = "Pass@word1";

// appsettings.json:9 - Exposed Azure Storage key
"STORAGE_TEST":"18gryvHXuSVGDBcdJ3+QhRypNi413Kri8oalcQPAAZ7UGMHjaTVpSq4R9fYqzCsmZDnvK6AaE8Ce+AStDHNkpQ=="

Vulnerable Dependencies:

• Microsoft.Data.SqlClient 5.0.2 → 5.2.1 (GHSA-98g6-xh36-x2p7)
• System.Text.Json 8.0.4 → 8.0.5+ (GHSA-8g4q-xg66-9fp4)

Command Injection: Index.cshtml.cs:22-24 - unsanitized query parameter used in command construction
ReDoS: DevSecOps.cshtml.cs:18 - regex ^(a+)+$ causes exponential backtracking

Documentation Delivered

• SECURITY_ASSESSMENT_REPORT.md (29KB): Detailed vulnerability analysis with CWE/OWASP mappings, impact assessments, remediation guidance, compliance analysis
• SECURITY_SUMMARY.md: Executive summary with prioritized action items
• SECURITY_DASHBOARD.txt: Visual ASCII dashboard for at-a-glance status
• SECURITY.md: Updated with assessment results and vulnerability reporting process

Remediation Timeline

48 hours: Rotate secrets, update dependencies, fix command injection
Week 1: Fix ReDoS, log injection, add security headers
Weeks 2-3: Implement auth/authz, input validation
Month 1: Rate limiting, CSRF fixes, configuration hardening

Recommendations

1. Enable GitHub Advanced Security (Secret Scanning, CodeQL, Dependabot)
2. Migrate secrets to Azure Key Vault with Managed Identity
3. Implement ASP.NET Core Identity for authentication
4. Add security headers middleware (CSP, X-Frame-Options, etc.)
5. Establish SDL with automated security testing in CI/CD

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