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Application Security

ASVS 5.0 V16.5.1: Return Generic Errors, Never Internal Detail

ASVS V16.5.1 requires a generic message for unexpected errors with no stack traces, queries or tokens. Express, Spring and Flask examples, plus tests.

Oct 18, 20265 min read
Application Security

ASVS 5.0 V16.4.3: Ship Logs to a Logically Separate System

ASVS V16.4.3 wants logs sent securely to a separate system so a breach of the app does not compromise the evidence. Setup, test and pitfalls.

Oct 18, 20265 min read
Application Security

ASVS 5.0 V16.4.2: Protect Logs From Access and Modification

ASVS V16.4.2 says logs must be shielded from unauthorized access and be tamper resistant. What to configure and how to prove it to an auditor.

Oct 18, 20263 min read
Application Security

ASVS 5.0 V16.4.1: Encode Log Data to Prevent Log Injection

ASVS V16.4.1 requires every logging component to encode data so attackers cannot forge log lines. Code for Python, Java and Node, plus a test.

Oct 18, 20266 min read
Application Security

ASVS 5.0 V16.3.4: Log Unexpected Errors and Control Failures

ASVS V16.3.4 asks you to log unexpected errors and security control failures, such as a failed backend TLS handshake. Here is how to do it and test it.

Oct 18, 20264 min read
Application Security

ASVS 5.0 V16.3.3: Log Attempts to Bypass Security Controls

ASVS V16.3.3 asks you to log defined security events and attempts to bypass validation, business logic and anti automation controls. Examples and tests.

Oct 18, 20262 min read
Application Security

ASVS 5.0 V16.3.2: Log Failed Authorization Attempts

ASVS V16.3.2 requires failed authorization to be logged, and at Level 3 every decision and sensitive data access. Middleware example and test steps.

Oct 18, 20263 min read
Application Security

ASVS 5.0 V16.3.1: Log Every Authentication Attempt

ASVS V16.3.1 requires logging all successful and failed authentication, with the method and factors used. What to record, sample code and tests.

Oct 18, 20263 min read
Application Security

ASVS 5.0 V16.2.5: Keep Sensitive Data Out of Your Logs

ASVS V16.2.5 asks that logging follows each data type's protection level: never log credentials, mask or hash tokens. Redaction code and a leak test.

Oct 18, 20263 min read

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