With so many physical products—from automobiles to airplanes and medical devices to industrial control systems—now being driven by software, product security has become a top-level concern for manufacturers. Software flaws can not only affect security by introducing vulnerabilities that can be exploited by attackers but also impact safety by compromising a product’s functional operation.
In addition, product security has significant financial implications. For example, fixing a vulnerability in development costs 10 times less than in testing and 100 times less than fixing it in production. This explains why static application security testing (SAST) has become a cornerstone of product security and the engine for implementing code analysis at the earliest stages of development, commonly known as shift left security.
Unlike other forms of application security testing (AST), SAST scans 100% of the code, including configuration files, not just the code that is executed at runtime. SAST can also provide additional benefits, such as quality and architectural testing. Software quality and security are inextricably linked since poorly written software typically is insecure software.
With the stakes so high, getting SAST right is the tipping point for any product security program. To evaluate SAST tools, consider the following checklist to make sure they align with your business requirements:
1. Deep Language Support: C/C++, Java, C#, etc.
Languages are often selected based on the programmatic requirements of the software producer, the needs of the consumer and the hardware associated with the product. For example, developing software for safety-critical applications like aerospace requires different capabilities than languages used to build web applications.
2. Compiler and Embedded OS Platform Compatibility
Compilers used for embedded software development implement unique flags for configuration, such as performance optimizations, code size, error checking and the diagnostic information emitted. Since embedded OS platforms typically include compiler and debugging tools plus the various OS files and configuration options, make sure the SAST tool can integrate with the development environment used.
3. Actionable Alerts
For the DevOps team to embrace security, embedding security in the software factory life cycle cannot slow down development velocity or hinder developers’ ability to meet software release timelines. False positives redirect developer attention away from writing software to investigating potential defects. Too many false positives result in developers losing faith in true positives and paying less attention to security alerts of real substance.
4. Built-In DevOps Integration
The software development life cycle employs an extensive toolset that provides automation to help developers get products to the production stage faster—not unlike a manufacturing plant or factory. Make sure the SAST tool supports and integrates with distinct tool categories including collaboration and management, source control and repositories, IDEs, compilers, orchestration and automation and business intelligence.
5. Flexible Deployment
Depending on the organization and industry, SAST may need to support a variety of deployment options, including on-premises, cloud, hybrid, etc. For example, air-gapped deployments are often required in security-sensitive environments where the data protection uncertainty associated with multitenant public clouds is unacceptable. Meanwhile, cloud-based SAST can provide benefits like scalability and elasticity and reduce infrastructure capital investments.
6. Developer-friendly UI
Shift left security is accomplished by integrating security warnings into the integrated development environment (IDE) used by engineers. A SAST tool that works within existing IDEs can reduce the number of errors presented to testers, which subsequently reduces the volume of kickbacks to engineering and leads to faster time-to-market.
7. Standards
Many organizations use—and some must comply with—standards for software coding best practices such as SEI CERT, MISRA, etc., which provide a framework for improving the safety, reliability and security of software systems. In addition, a company may need to satisfy functional safety standards such ISE 61508, as well as derivative industry specific standards including IEC 62304 (Medical), ISO 26262 (Automotive), DO-178C (Avionics) and IEC 62434 (Security). A SAST tool should provide integration with key standards that govern an organization’s products and, where appropriate, be certified for them.
Using these guidelines for evaluating SAST tools will help ensure that the product you select meets your organization’s business, technology, safety and security requirements.
