Best Practices - Application & Web Security
Why Application & Web Security Matters
Even well-written code can be undermined by insecure deployment, weak authentication, exposed secrets, or outdated dependencies. Administrators and DevOps teams play a critical role in configuring, securing, and maintaining application environments to prevent breaches, data exposure, and service outages.
Common Risks
| Category | Description | Key Controls (At a Glance) |
|---|---|---|
Insecure Input/Output Handling | Poor validation and encoding can cause injection and XSS vulnerabilities. | Support secure coding practices; enforce input validation and output encoding. |
Weak Authentication & Authorization | Custom or misconfigured login flows may allow unauthorized access. | Use centralized SSO; require MFA (preferably biometric or passkeys); enforce server-side authorization checks. |
Hard-Coded or Exposed Secrets | Secrets in code or config files are easily leaked or misused. | Use approved secrets vaults; rotate secrets; restrict access. |
Vulnerable Dependencies | Outdated libraries can be exploited even if the application logic is secure. | Track and patch dependencies; use Software Composition Analysis (SCA) tools; remove unused libraries. |
Misconfigured TLS & Sessions | Weak ciphers or insecure cookies enable interception or session hijacking. | Require modern TLS; enforce secure cookie flags; use proper session policies. |
Note:
The “Key Controls (At a Glance)” column is intended as a quick reference. Detailed expectations and implementation guidance are described in the Best Practices sections below.
General Best Practices
Support Secure Coding & Input/Output Controls
- Ensure developers validate input server-side (type, length, format).
- Encourage use of Object-Relational Mappings (ORMs) or parameterized queries.
- Ensure output is encoded for its target context (HTML, URL, JS).
- Disable debug endpoints in production.
Harden Authentication & Authorization
- Prefer central authentication (SSO via SAML/OIDC) over local authentication.
- Require MFA (preferably biometric or passkeys) for admins and systems supporting sensitive data/functions.
- Enforce server-side authorization checks on every request.
Manage Secrets Properly
- Store credentials in approved secrets management systems, not in code.
- Limit access to secrets and log secret access when possible.
- Rotate secrets after staff transitions or suspected exposure.
Secure TLS & Sessions
- Enforce HTTPS with modern TLS versions and ciphers.
- Configure secure cookies (Secure, HttpOnly, SameSite).
- Set reasonable session timeouts; invalidate sessions after logout.
Minimize Internet Exposure
- Only expose services that must be publicly reachable.
- Place web applications behind reverse proxies or application gateways.
- Use Web Application Firewalls (WAF) for externally facing apps.
Keep Dependencies Up to Date
- Track major frameworks and libraries.
- Use automated SCA tools in CI/CD pipelines.
- Apply security updates after testing.
Integrate Security into the SDLC
- Add SAST to build pipelines.
- Use DAST for public-facing applications.
- Include security criteria in change requests and release notes.
Log and Monitor Application Activity
- Log authentication, authorization failures, and admin actions.
- Send application logs to central SIEM for correlation with infrastructure events.
- Investigate anomalies promptly and adjust controls as needed.