Memory safety properties
Memory safety prevents a program from reading or writing outside an allocated object, using memory after its lifetime, using uninitialized data, or treating memory as an incompatible type. Violations include buffer overflow, out-of-bounds access, use-after-free, double free, invalid pointer use, and related control-flow corruption.
An attacker can turn these defects into information disclosure, denial of service, arbitrary write, or code execution in the process security context.
Remove the weakness class
Prefer a memory-safe language and safe libraries for new components. Use ownership, bounds checks, managed lifetimes, strong types, and safe interfaces so ordinary code cannot express the invalid operation. Isolate the smallest necessary unsafe region and give it an explicit contract, review, tests, and narrow authority.
For existing memory-unsafe code, prioritize exposed parsers, network services, privileged components, cryptographic code, and libraries that process attacker-controlled input. Replace high-risk components when practical. A roadmap should state inventory, risk, migration order, owners, and measurable progress.
Mitigation and verification
Compiler and platform defenses such as stack protection, non-executable memory, address randomization, control-flow integrity, hardware memory tagging, and sandboxing can make exploitation harder or reduce impact. They do not remove the underlying defect.
Use sanitizers in tests, fuzz parsers and protocol state machines, apply static analysis, review unsafe operations, and test boundary and lifetime behavior. Keep toolchains and dependencies current. Run the service with the least operating-system, filesystem, network, and secret authority required.
Failure and residual risk
A memory-safe language can call unsafe native code or depend on a vulnerable runtime. Logic, authorization, injection, and cryptographic flaws remain possible. Fuzzing explores inputs but does not prove absence of defects. Exploit mitigations can be bypassed and can vary by build or platform.
Pomerium boundary
Pomerium can reduce who reaches an upstream service and can isolate public application access from direct paths. It cannot repair a memory-safety defect in an upstream parser, library, kernel, or runtime. The vulnerable process can still be reached by an authenticated user or internal service. Owners must remove or mitigate the defect and limit process authority.
Evaluation checklist
- Which components process untrusted input in memory-unsafe code?
- Can new or replaced components use a memory-safe language and safe library boundary?
- Are unsafe regions small, explicit, reviewed, and tested under sanitizers and fuzzing?
- Which exploit mitigations are active in the exact production artifact and platform?
- What authority and secrets would process compromise expose?
- Does the migration roadmap measure elimination of weakness classes rather than only defect counts?
