The Cisco ASA VPN gateway must be configured to restrict what traffic is transported via the IPsec tunnel according to flow control policies.
An XCCDF Rule
Description
<VulnDiscussion>Unrestricted traffic may contain malicious traffic which poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth and other resources. VPN traffic received from another enclave with different security policy or level of trust must not bypass being inspected by the firewall before being forwarded to the private network.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-239960r666286_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Step 1: Define what traffic will be transported via the IPsec tunnel as shown in the example below.
ASA1(config)# access-list SITE1_SITE2 extended permit ip 192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0
Step 2: Apply the ACL to the IPsec crypto map.