Competition Kernel Container Escape
Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for kernel attack surface, namespace and cgroup boundaries, container isolation assumptions, syscall paths, and escape primitive verification. Use when the user asks to analyze container-to-host escape paths, kernel exploit prerequisites, namespace crossover, capability misuse, or prove whether an exploit primitive cross…
Install
$ agentstack add skill-zhaoxuya520-reverse-skill-competition-kernel-container-escape ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
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Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-zhaoxuya520-reverse-skill-competition-kernel-container-escape) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
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.
Reply in Simplified Chinese unless the user explicitly requests English.
Quick Start
- Map runtime isolation first: namespaces, cgroups, seccomp, capabilities, LSM, and mount boundaries.
- Separate exploit prerequisite, primitive, and boundary-crossing proof.
- Record kernel version, config hints, runtime options, and reachable syscall surface.
- Keep instrumented observations separate from pristine challenge path.
- 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.mdfor 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
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: zhaoxuya520
- Source: zhaoxuya520/reverse-skill
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.