Full Report
NSA and CISA are urging developers to adopt memory safe languages (MSLs) to combat vulnerabilities in software
Analysis Summary
# Best Practices: Migrating to Memory Safe Languages for Software Security
## Overview
These practices, jointly urged by the NSA and CISA, focus on modernizing software development by adopting Memory Safe Languages (MSLs). The primary goal is to inherently eliminate entire classes of critical vulnerabilities, such as buffer overflows, which are frequently exploited in cyber-attacks, thereby significantly enhancing system integrity and security posture.
## Key Recommendations
### Immediate Actions
1. **Conduct Vulnerability Assessment:** Inventory all existing codebases, specifically identifying components written in memory-unsafe languages (e.g., C, C++).
2. **Prioritize High-Risk Components:** Immediately tag systems or modules handling critical data, infrastructure control, or high-volume transactions for urgent review and potential MSL migration.
3. **Establish MSL Policy:** Issue an internal directive mandating that all *new* development projects must utilize a memory-safe language by default.
### Short-term Improvements (1-3 months)
1. **Pilot MSL Adoption:** Select a non-critical, isolated component or new feature development (greenfield project) to be rewritten or implemented entirely in a chosen MSL (e.g., Rust).
2. **Developer Training Initiative:** Launch targeted training programs for development teams focusing on the syntax, idioms, and memory safety guarantees of the chosen MSLs.
3. **Update Supply Chain Vetting:** Incorporate checks for memory safety risk profiles when evaluating third-party libraries and dependencies.
### Long-term Strategy (3+ months)
1. **Create Migration Roadmap:** Develop a phased strategy to systematically refactor or rewrite high-risk legacy components from memory-unsafe languages to MSLs.
2. **Integrate MSL Tooling:** Integrate security static analysis tools specifically designed for the chosen MSLs into the continuous integration/continuous deployment (CI/CD) pipeline to enforce safety guarantees automatically.
3. **Measure Security Debt Reduction:** Track the number of memory-related vulnerabilities found in new code versus legacy code to quantitatively measure the efficacy of the MSL transition strategy.
## Implementation Guidance
### For Small Organizations
- **Focus on New Development:** Prioritize using established MSLs for all new service development to avoid inheriting legacy debt immediately, using readily available, well-supported languages.
- **Leverage Managed Services:** Where possible, substitute custom code relying on older languages with cloud-native services or commercial off-the-shelf (COTS) software known to use safer languages or managed memory models.
### For Medium Organizations
- **Targeted Refactoring:** Identify 1-2 critical but contained legacy applications and allocate resources specifically to rewrite these modules using MSLs as a controlled proof-of-concept before broader rollout.
- **Cross-Training:** Cross-train developers from different teams on MSL practices to disseminate knowledge and build internal expertise clusters.
### For Large Enterprises
- **Establish a Center of Excellence (CoE):** Form a specialized team responsible for setting coding standards, evaluating MSL frameworks (e.g., evaluating Rust vs. Go vs. C# memory models), and overseeing the large-scale migration roadmap.
- **Interoperability Strategy:** Develop clear interface boundaries and Foreign Function Interface (FFI) best practices to safely interface new MSL components with essential, long-lived legacy components that cannot be immediately rewritten.
- **Mandate Standard Libraries:** Standardize the use of audited, memory-safe versions of commonly used data structures and cryptographic primitives.
## Configuration Examples
*The provided text focuses on language selection rather than specific runtime configuration. However, the implementation guidance points toward configuration practices:*
1. **CI/CD Enforcement:** Configure build pipelines to **fail the build** if static analysis tools report critical memory safety violations in MSL-based code.
2. **Compiler Flags (Example for Rust integration):** Ensure compiler flags enforce strict safety checks, such as utilizing built-in bounds checking and overflow detection mechanisms by default.
## Compliance Alignment
The adoption of Memory Safe Languages directly supports foundational security principles required by major frameworks:
- **NIST SP 800-53 / CSF:** Supports controls related to **SA-11 (Software, Firmware, and Information System Documentation)** and **SC-8 (Transmission Confidentiality and Integrity)** by reducing the attack surface exploited through exploitation chains originating from memory corruption.
- **ISO/IEC 27001:** Addresses the objective of **A.14 (Acquiring, Developing, and Maintaining Systems)** by ensuring secure development practices are followed.
- **CIS Critical Security Controls (CSC):** Aligns with **Control 18 (Application Software Security)** by actively designing out common classes of vulnerabilities at the source.
## Common Pitfalls to Avoid
1. **Ignoring Interoperability Costs:** Underestimating the complexity and performance overhead associated with creating secure wrappers or interfaces between high-performance, memory-unsafe code and new MSL code.
2. **Treating MSL as a Silver Bullet:** Failing to implement other crucial security practices (like input validation, proper authentication, and strong authorization) simply because the language is memory-safe. Memory safety addresses *one* class of bugs, not all security flaws.
3. **Incomplete Training:** Assuming developers can transition seamlessly. Insufficient training leads to developers circumventing MSL safety guarantees (e.g., using `unsafe` blocks unnecessarily), reintroducing vulnerabilities.
## Resources
The guidelines are based on the joint report from government agencies:
- **Joint Report Name (Defanged Reference):** *Memory Safe Languages: Reducing Vulnerabilities in Modern Software Development* (Referenced under NSA/CISA joint guidance).
- **Recommended Languages:** Focus efforts on languages like **Rust**, and others that provide stronger memory guarantees by design.