Build scripts being able to run arbitrary code or access the network is always dangerous even if it was just local on developer machines. It's also more evidence that Docker/LXC is not a security boundary and all untrusted code should run in a Firecracker VM.

The problem with agents is not that we don't know how to defend. It's that defenders need to be more careful and work faster than ever. We can say now that wide scoped tokens should have been retired for years and it's all RubyGems fault but the reality is a lot of organization are not prepared for this.

Even if they take security seriously they don't have enough manpower or a good strategy to implement it, and sometimes you have no idea that something is a problem because it wasn't a problem for years.