Competition Kernel Container Escape

Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to $ctf-sandbox-orchestrator first.

Use this skill when the decisive step is proving a boundary crossing between containerized context and host or higher-privilege kernel context.

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Quick Start

1. Map runtime isolation first: namespaces, cgroups, seccomp, capabilities, LSM, and mount boundaries.
2. Separate exploit prerequisite, primitive, and boundary-crossing proof.
3. Record kernel version, config hints, runtime options, and reachable syscall surface.
4. Keep instrumented observations separate from pristine challenge path.
5. Reproduce one minimal primitive-to-boundary-crossing chain.

Workflow

1. Map Isolation And Kernel Surface

• Record namespace map, cgroup mode, capabilities, seccomp profile, AppArmor or SELinux state, mounted filesystems, and runtime sockets.
• Note kernel version, distro build hints, module exposure, and container runtime behavior.
• Keep host and container observations linked to exact node and context.

2. Prove Exploit Primitive And Crossover

• Show controllable input, trigger condition, affected object, and observable kernel or runtime state change.
• Capture before and after identity, namespace, mount, or process visibility to prove boundary crossing.
• Distinguish crash-only behavior from stable capability gain.

3. Reduce To Decisive Escape Chain

• Compress to: prerequisite state -> primitive trigger -> boundary crossing evidence -> resulting host-level capability.
• State whether root cause is kernel vulnerability, runtime misconfiguration, capability overgrant, or namespace leak.
• If path relies mostly on credential replay after initial foothold, hand off to Linux credential pivot skill.

Read This Reference

• Load references/kernel-container-escape.md for isolation checklist, primitive checklist, and parity guidance.

What To Preserve

• Kernel and runtime context, capability set, seccomp or LSM state, and namespace map
• Primitive trigger data, boundary crossing evidence, and resulting capability
• One minimal reproducible chain from container context to host-relevant effect