All systems have vulnerabilities, either in the technology from which they are constructed or in the behaviors of the people who use them.
The Build Security In Guidelines is a taxonomy of mid-level engineering concerns that were derived from the vulnerability database accumulated by the CERT® Coordination Center over its 15-year history. In general, these concerns are less abstract than the Build Security In Principles—which are intended to be enduring top-level concerns—and more abstract than the Build Security In Coding Rules—which are intended to be precise, specific implementation advice.
Assume that Technology Will Contain Vulnerabilities
Validate All Input as Precisely as Possible
Use All Security Mechanisms Correctly
Do Not Allow Your System to Ever Use or Depend on Language Behaviors that Are "Undefined"
In every phase of a system's development, under particular conditions, features added—or omitted—can introduce security vulnerabilities. To produce a safe and secure system, the competent, security-conscious engineer must
learn the meaning of software assurance and be knowledgeable in the practice of supporting techniques,
recognize the security implications of all functional requirements,
recognize the security implications of missing requirements,
recognize emergent behaviors in the system that have security implications,
recognize the implications of an evolving deployment environment on the system,
translate those implications into additional system requirements,
design features to meet those requirements,
recognize the security implications of the included and omitted features,
add, modify, or remove features accordingly,
recognize the security implications of the system's implementation,
correct any defects in the implementation,
understand how to test the system for compliance with security requirements, and
be able to use software assurance techniques to demonstrate the assurance attributes of the system.
A failure in any of these, and more, can leave the system with security vulnerabilities.
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