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Pascual Vila

Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Treating "delete the committed secret from the latest commit" as sufficient remediation for a leak

// Insufficient alone: // git rm .env && git commit -m "remove secret" // Required first: // Rotate the actual credential at its source (DB, API provider, etc.)

The Solution //

Removing a file from the current commit does nothing to the secret's presence in git history — anyone with clone access (or who cloned before the fix) can still retrieve it via git log -p or a similar history search. The only real fix is rotating the secret at its source immediately; history cleanup is a secondary, less urgent step afterward.

The Error //

Granting a service broad access to every secret in the secrets manager instead of scoping to what it actually needs

// Wrong: this service can read ALL production secrets "Resource": "arn:aws:secretsmanager:*:*:secret:prod/*" // Correct: scoped to only this service's own secrets "Resource": "arn:aws:secretsmanager:*:*:secret:prod/email-service/*"

The Solution //

Overly broad IAM permissions mean that if any single service is ever compromised (via a dependency vulnerability, for instance), the blast radius extends to every secret that service could access — not just the ones it legitimately uses. Scope each service's secrets-manager IAM policy to only the specific secret paths it needs.

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