10 Layers Deep: How StepSecurity Stops TeamPCP's Trivy Supply Chain Attack on GitHub Actions
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TeamPCP compromised 76 Trivy GitHub Action version tags and later the Checkmarx KICS action, injecting credential stealers that read secrets from runner memory and exfiltrated them to attacker-controlled domains. StepSecurity's platform counters these attacks through ten independent security layers: network egress block mode (drops unauthorized outbound connections), process lockdown mode (terminates jobs on suspicious memory reads), StepSecurity Maintained Actions (hardened alternatives to risky third-party actions), policy-driven PRs that auto-pin actions to immutable commit SHAs, runtime network and process monitoring, imposter commit detection, AI-powered ecosystem threat intelligence, workflow run policies that cancel jobs referencing known-compromised actions, and an Actions Inventory for rapid blast-radius mapping during incidents. The core argument is that defense in depth is essential because attackers must succeed at every kill-chain step while defenders only need to stop them at one.
Table of contents
The Full Defense WalkthroughPreventive Controls: What StepSecurity Has in Place Before an AttackRuntime Detection: How StepSecurity Catches What Prevention MissesThreat Intelligence: StepSecurity's Ecosystem Wide MonitoringWorkflow Run Policies: The Pre Execution GateIncident Response: Mapping the Blast Radius with Actions InventoryThe Broader Threat LandscapeKey Takeaway: Defense in Depth WorksSort: