Detection Container Escape Attempts

Genel Bakış

Container escape is a critical attack technique where an adversary breaks out of container isolation to access the host system or other containers. Tespit involves monitoring for escape indicators such as namespace manipulation, capability abuse, kernel exploits, mounted sensitive paths, and anomalous syscall patterns using runtime security tools like Falco, Sysdig, and custom seccomp/audit rules.

Ne Zaman Kullanılır

• investigating yaparken security incidents that require Tespit etme container escape attempts
• building yaparken Tespit rules or threat hunting queries for this domain
• SOC yaparken: analysts need structured procedures for this analysis type
• validating yaparken security monitoring coverage for related attack techniques

Ön Gereksinimler

• Linux host with kernel 5.10+ (eBPF support)
• Falco 0.37+ kurulu (kernel module or eBPF probe)
• Docker Engine or containerd runtime
• auditd configured
• Root access for eBPF/kernel module loading

Core Concepts

Common Container Escape Vectors

Vector	Technique	MITRE ID
Privileged containers	Mount host filesystem, load kernel modules	T1611
Docker socket mount	Create privileged container from within	T1610
Kernel exploits	CVE-2022-0185 (fsconfig), Dirty Pipe, runc CVEs	T1068
Capability abuse	CAP_SYS_ADMIN, CAP_SYS_PTRACE, CAP_NET_ADMIN	T1548
Sensitive mounts	/proc/sysrq-trigger, /proc/kcore, cgroup release_agent	T1611
Namespace escape	nsenter, unshare to host namespaces	T1611
Symlink/bind mount	Escape through /proc/self/root	T1611

Tespit Layers

1. Syscall monitoring - eBPF/kernel module captures syscalls in real-time
2. File integrity - tespit etme
   modification of escape-enabling paths
3. Process monitoring - Track process creation, namespace changes
4. Network monitoring - tespit etme
   container-to-host connections
5. Audit logging - Linux auditd for capability and mount operations

İş Akışı

Adım 1: Dağıt: Falco for Runtime Tespit

falco:
  driver:
    kind: ebpf   # or modern_ebpf for kernel 5.8+
  rules_files:
    - /etc/falco/falco_rules.yaml
    - /etc/falco/falco_rules.local.yaml
    - /etc/falco/rules.d
  json_output: true
  json_include_output_property: true
  http_output:
    enabled: true
    url: "http://falcosidekick:2801"
  grpc:
    enabled: true
  priority: warning

helm repo add falcosecurity https://falcosecurity.github.io/charts
helm install falco falcosecurity/falco \
  --namespace falco-system --create-namespace \
  -f falco-values.yaml

Adım 2: Custom Falco Rules for Escape Tespit

- rule: Container Escape via Privileged Mode
  desc: tespit etme
attempts to escape container using privileged capabilities
  condition: >
    spawned_process and container and
    (proc.name in (nsenter, unshare, mount, umount, modprobe, insmod) or
     (proc.name = chroot and proc.args contains "/host"))
  output: >
    Container escape attempt via privileged operation
    (user=%user.name container=%container.name image=%container.image.repository
     command=%proc.cmdline pid=%proc.pid %container.info)
  priority: CRITICAL
  tags: [container, escape, T1611]

- rule: Container Erişim: Docker Socket
  desc: tespit etme
container reading/writing to Docker socket
  condition: >
    (open_read or open_write) and container and
    fd.name = /var/run/docker.sock
  output: >
    Docker socket accessed from container
    (user=%user.name container=%container.name image=%container.image.repository
     fd=%fd.name command=%proc.cmdline %container.info)
  priority: CRITICAL
  tags: [container, escape, docker_socket]

- rule: Container Erişim: Sensitive Proc Paths
  desc: tespit etme
container accessing host-sensitive proc paths
  condition: >
    open_read and container and
    (fd.name startswith /proc/sysrq-trigger or
     fd.name startswith /proc/kcore or
     fd.name startswith /proc/kmsg or
     fd.name startswith /proc/kallsyms or
     fd.name startswith /sys/kernel)
  output: >
    Sensitive proc/sys access from container
    (user=%user.name container=%container.name path=%fd.name
     command=%proc.cmdline %container.info)
  priority: CRITICAL
  tags: [container, escape, proc_access]

- rule: Container Cgroup Escape Attempt
  desc: tespit etme
writing to cgroup release_agent (escape technique)
  condition: >
    open_write and container and
    (fd.name contains release_agent or
     fd.name contains notify_on_release)
  output: >
    Cgroup escape attempt Detected
    (user=%user.name container=%container.name path=%fd.name
     command=%proc.cmdline %container.info)
  priority: CRITICAL
  tags: [container, escape, cgroup]

- rule: Container Loading Kernel Module
  desc: tespit etme
container attempting to load kernel modules
  condition: >
    spawned_process and container and
    (proc.name in (modprobe, insmod, rmmod) or
     (evt.type = init_module or evt.type = finit_module))
  output: >
    Kernel module load attempt from container
    (user=%user.name container=%container.name command=%proc.cmdline
     %container.info)
  priority: CRITICAL
  tags: [container, escape, kernel_module]

- rule: Container Namespace Manipulation
  desc: tespit etme
setns/unshare syscalls from container
  condition: >
    container and (evt.type = setns or evt.type = unshare) and
    not proc.name in (containerd-shim, runc)
  output: >
    Namespace manipulation from container
    (user=%user.name container=%container.name syscall=%evt.type
     command=%proc.cmdline %container.info)
  priority: CRITICAL
  tags: [container, escape, namespace]

- rule: Container Mount Sensitive Filesystem
  desc: tespit etme
container mounting host filesystems
  condition: >
    spawned_process and container and proc.name = mount and
    (proc.args contains "/dev/" or proc.args contains "proc" or
     proc.args contains "sysfs")
  output: >
    Sensitive mount operation from container
    (user=%user.name container=%container.name command=%proc.cmdline
     %container.info)
  priority: HIGH
  tags: [container, escape, mount]

Adım 3: Configure Seccomp Profile for Escape Prevention

{
  "defaultAction": "SCMP_ACT_ERRNO",
  "archMap": [
    { "architecture": "SCMP_ARCH_X86_64", "subArchitectures": ["SCMP_ARCH_X86", "SCMP_ARCH_X32"] }
  ],
  "syscalls": [
    {
      "names": [
        "read", "write", "open", "close", "stat", "fstat", "lstat",
        "poll", "lseek", "mmap", "mprotect", "munmap", "brk",
        "rt_sigaction", "rt_sigprocmask", "ioctl", "access",
        "pipe", "select", "sched_yield", "dup", "dup2",
        "nanosleep", "getpid", "socket", "connect", "accept",
        "sendto", "recvfrom", "bind", "listen", "getsockname",
        "getpeername", "socketpair", "setsockopt", "getsockopt",
        "clone", "fork", "vfork", "execve", "exit", "wait4",
        "kill", "getuid", "getgid", "geteuid", "getegid",
        "epoll_create", "epoll_wait", "epoll_ctl", "epoll_create1",
        "futex", "set_tid_address", "set_robust_list",
        "openat", "newfstatat", "readlinkat", "fchownat",
        "clock_gettime", "clock_getres", "clock_nanosleep",
        "getrandom", "memfd_create", "statx", "rseq"
      ],
      "action": "SCMP_ACT_ALLOW"
    },
    {
      "names": ["unshare", "setns", "mount", "umount2", "pivot_root",
                "init_module", "finit_module", "delete_module",
                "kexec_load", "kexec_file_load", "ptrace",
                "reboot", "swapon", "swapoff", "sethostname",
                "setdomainname", "keyctl", "bpf"],
      "action": "SCMP_ACT_LOG",
      "comment": "Log escape-relevant syscalls for Tespit"
    }
  ]
}

Adım 4: Audit Rules for Container Escape

-a always,exit -F arch=b64 -S setns -S unshare -k container_escape
-a always,exit -F arch=b64 -S mount -S umount2 -k container_mount
-a always,exit -F arch=b64 -S init_module -S finit_module -S delete_module -k kernel_module
-a always,exit -F arch=b64 -S ptrace -k process_trace

-w /var/run/docker.sock -p rwxa -k docker_socket
-w /proc/sysrq-trigger -p w -k sysrq
-w /proc/kcore -p r -k kcore_read

-w /usr/bin/runc -p x -k container_runtime
-w /usr/bin/containerd -p x -k container_runtime
-w /usr/bin/docker -p x -k container_runtime

Adım 5: Real-Time Alert Pipeline

config:
  slack:
    webhookurl: "https://hooks.slack.com/services/xxx"
    minimumpriority: "critical"
    messageformat: |
      *Container Escape Alert*
      Rule: {{ .Rule }}
      Priority: {{ .Priority }}
      Output: {{ .Output }}

  elasticsearch:
    hostport: "https://elasticsearch:9200"
    index: "falco-alerts"
    minimumpriority: "warning"

  pagerduty:
    routingkey: "xxxx"
    minimumpriority: "critical"

Doğrulama Commands

kubectl run falco-event-generator \
  --image=falcosecurity/event-generator \
  --restart=Never \
  -- run syscall --action PtraceAttachContainer

kubectl logs -n falco-system -l app.kubernetes.io/name=falco --tail=50

docker Denetle: --format '{{.HostConfig.SecurityOpt}}' <container-id>

ausearch -k container_escape --interpret

References

• Falco Runtime Security
• Container Escape Techniques - HackTricks
• MITRE ATT&CK T1611 - Escape to Host
• Sysdig Container Security

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