[Security Review] Daily Security Review 2026-10-13

[github-actions[bot]]

📊 Executive Summary

Security posture is strong and layered (Squid L7 ACL + iptables NAT/filter + capability drop + seccomp default-deny + no-new-privileges). No critical or high issues were found in this review. Scope was limited: /tmp/gh-aw/escape-test-summary.txt was empty (0 bytes) and npm audit failed (registry TLS error in sandbox), so neither complementary source was available.

🔍 Findings from Firewall Escape Test

cat /tmp/gh-aw/escape-test-summary.txt → empty (ls -la: 0 bytes). No escape-test data to cross-reference this run.

🛡️ Architecture Security Analysis

Network: containers/agent/setup-iptables.sh:106-122 blocks 15 dangerous ports (SSH, SMTP, DBs, RDP, SMB...) with audit LOG rules (~466); DNAT 80/443→Squid is defense in depth; src/host-iptables.ts re-exports host-iptables-rules. DNS limited to configured servers.

Container (src/services/agent-service.ts:58-86): agent gets cap_add: SYS_CHROOT, SYS_ADMIN (dropped via capsh before user code), cap_drop: NET_RAW, SYS_PTRACE, SYS_MODULE, SYS_RAWIO, MKNOD, no-new-privileges:true, custom seccomp (defaultAction: SCMP_ACT_ERRNO, containers/agent/seccomp-profile.json:2), apparmor:unconfined. NET_ADMIN only on the iptables-init container with cap_drop: ALL. procfs mounted with hidepid=2,nosuid,nodev,noexec (entrypoint.sh:648).

Domain validation (src/domain-patterns.ts:66-122): wildcard * → [a-zA-Z0-9.-]*, anchored ^...$, other metacharacters escaped; ReDoS-safe.

Input validation: grep "shell: *true\|exec(" in non-test src/ found only regex .exec usage, no shell-string command execution.

⚠️ Threat Model (STRIDE)

Category	Threat	Evidence	Likelihood	Impact	Rating
Spoofing	Agent impersonating API proxy credentials	API keys withheld from agent when proxy enabled	Low	High	Low
Tampering	Modifying iptables from agent	NET_ADMIN/NET_RAW absent from agent	Low	High	Low
Repudiation	Missing audit trail	Squid firewall_detailed logs + iptables LOG rules	Low	Med	Low
Info disclosure	Reading other procs' environ	hidepid=2, token unset	Low	High	Low
DoS	Resource exhaustion	mem_limit 6g, pids limit, swap policy configurable	Med	Low	Low
EoP	SYS_ADMIN window + apparmor:unconfined	agent-service.ts:62-82	Low	High	Medium (residual: relies on capsh drop ordering)
EoP	chmod 777 "$SETTINGS_DIR"	entrypoint.sh:304	Low	Low	Low (verify directory scope)

🎯 Attack Surface Map

Surface	Entry	Protections	Risk
Network egress	setup-iptables.sh, Squid ACL	domain allowlist, port blocklist, DNS restriction	Low
Container runtime	src/services/agent-service.ts:66-82	cap drop, seccomp, NNP	Medium (AppArmor off)
Domain parsing	src/domain-patterns.ts	escape + anchor	Low
CLI input	src/cli.ts, src/squid/validation.ts	validation, no shell strings	Low
Docker wrapper/DinD	--enable-dind, docker socket	opt-in	Medium when enabled
Enclaves/API proxy	containers/enclave, containers/api-proxy	isolated networks, capability auth	Low–Med

📋 Evidence Collection

Commands

• cat /tmp/gh-aw/escape-test-summary.txt → empty
• sed -n 55,90p src/services/agent-service.ts → caps/security_opt as above
• grep defaultAction containers/agent/seccomp-profile.json → "defaultAction": "SCMP_ACT_ERRNO"
• sed -n 104,125p containers/agent/setup-iptables.sh → DANGEROUS_PORTS list
• grep -n capsh|hidepid containers/agent/entrypoint.sh → hidepid at 648, capsh privilege drop at ~1674
• npm audit → failed (self-signed certificate in sandbox)

✅ Recommendations

• Critical/High: none.
• Medium: Keep a regression test asserting SYS_ADMIN/SYS_CHROOT are absent from the user process's effective set; consider narrowing apparmor:unconfined with a custom profile permitting only the procfs mount.
• Low: Review chmod 777 "$SETTINGS_DIR" (entrypoint.sh:304) for narrower permissions; extend dangerous-port list (e.g., 5900 VNC, 2375/2376 Docker, 9200 Elasticsearch, 11211 memcached) though Squid/default deny already covers them; fix escape-test summary prefetch and run npm audit in an environment with registry access.

📈 Security Metrics

• Security-critical code reviewed: ~2,500 lines (setup-iptables.sh 540, entrypoint.sh 1850 sampled, domain-patterns 137, agent-service excerpt)
• Attack surfaces identified: 6
• STRIDE categories covered: 6/6

Generated by Daily Security Review and Threat Modeling · copilot · auto · 20.3 AIC · ⊞ 10.9K · ◷

• expires on Oct 20, 2026, 12:49 PM UTC