The Attack Vector of Choice
Why spend months finding a zero-day in a hardened application when you can simply compromise the build server and inject a backdoor into the source code before it’s even compiled? Supply chain attacks (like the infamous SolarWinds breach) have proven that CI/CD pipelines are the soft underbelly of modern software engineering.
Immutable Build Environments
To combat this, the build environment must be ephemeral and immutable. Every compilation should occur in a fresh, isolated container that is immediately destroyed afterward. All build dependencies must be cryptographically hashed and verified against a strict lockfile. If a hash mismatches by a single bit, the build is mercilessly halted.
Code Signing and Provenance
Finally, every artifact produced must be cryptographically signed by an offline key. This ensures that the binary deployed to production is exactly the binary that was built, proving its provenance. In my domain, unfaithful commits and unsigned binaries are subject to immediate termination. There is no room for compromise.