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5. Single-Host Deployment without Namespacing

5. Single-Host Deployment without Namespacing

Multiple MCP instances or agents share the same host/VM/container, leading to shared memory, disk, or env variables. Tech Detail:
  • /tmp used by multiple subprocesses
  • No Linux namespaces (unshare, cgroup, seccomp)
  • Shared env.json with unscoped secrets
Exploit Potential:
  • Tool A accesses Tool B’s /tmp/output.json
  • Env leakage via /proc/self/environ
Mitigation:
  • Per-tool Docker containers with AppArmor or gVisor
  • Use –mount=tmpfs, memory quotas, and noexec volumes
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