STIGQter: STIG Summary: Cisco ASA IPS Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 24 Jul 2024:

The Cisco ASA must be configured to block inbound traffic containing unauthorized activities or conditions.

DISA Rule

SV-239890r856156_rule

Vulnerability Number

V-239890

Group Title

SRG-NET-000390-IDPS-00212

Rule Version

CASA-IP-000500

Severity

CAT II

CCI(s)

• CCI-002661 - Monitor inbound communications traffic per organization-defined frequency for organization-defined unusual or unauthorized activities or conditions.

Weight

10

Fix Recommendation

Configure access control rules to block non-compliant traffic.

Step 1: Navigate to Configuration >> ASA FirePOWER Configuration >> Policies >> Access Control Policy. The Access Control Policy page appears.

Step 2: Click the edit icon next to the access control policy configured for intrusion inspection using access control rules.

Step 3: Click the edit icon next to the rule you want to edit. The access control rule editor appears.

Step 4: Set the rule action to Interactive Block or Interactive Block with reset.

Step 5: Select the Inspection tab. The Inspection tab appears.

Step 6: Select a system-provided or custom intrusion policy.

Step 7: Click Save to save the rule.
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Configure the ASA to redirect all traffic to the FirePOWER module in inline mode as shown in the example below.

Step 1: Configure access list for all traffic.

ASA1(config)# access-list FIREPOWER_REDIRECT extended permit ip any any

Step 2: Create a class-map in order to match the traffic on an access list.

ASA1(config)# class-map FIREPOWER_SFR
ASA1(config-cmap)# match access-list FIREPOWER_REDIRECT

Step 3: Configure deployment mode as inline.

ASA1(config)# policy-map global_policy
ASA1(config-pmap)# class FIREPOWER_SFR
ASA1(config-pmap-c)# sfr fail-open

Check Contents

Verify that an intrusion policy has been applied to access control rules.

Step 1: Navigate to Configuration >> ASA FirePOWER Configuration >> Policies >> Access Control Policy. The Access Control Policy page appears.

Step 2: Click the edit icon next to the access control policy configured for intrusion inspection using access control rules.

Step 3: Click the edit icon next to the rule you want to view. The access control rule editor appears.

Step 4: Verify that the rule action is set to Interactive Block or Interactive Block with reset.

Step 5: Select the Inspection tab. The Inspection tab appears.

Step 6: Verify that a system-provided or custom intrusion policy has been selected.

Note: An access control policy can have multiple access control rules associated with intrusion policies.
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Verify that the ASA is configured to redirect all traffic to the FirePOWER service module.

Step 1: Verify that the FirePOWER service module has been deployed in inline mode as shown in the example below.

policy-map global_policy
class FIREPOWER_SFR
sfr fail-open

Step 2: Verify that all traffic is redirected.

access-list FIREPOWER_REDIRECT extended permit ip any any
…
…
…
class-map FIREPOWER_SFR
match access-list FIREPOWER_REDIRECT

Note: Inbound and outbound traffic that is allowed by the ASA firewall is forwarded to the FirePOWER module. If the Cisco ASA FirePOWER module is configured in inline mode, the packet is inspected and dropped if it does not conform to access control policies. If the packet is compliant with access control policies, it is sent back to the ASA firewall for processing.

If the ASA is not configured to block inbound traffic containing unauthorized activities or conditions, this is a finding.

Vulnerability Number

V-239890

Documentable

False

Rule Version

CASA-IP-000500

Severity Override Guidance

Verify that an intrusion policy has been applied to access control rules.

Step 1: Navigate to Configuration >> ASA FirePOWER Configuration >> Policies >> Access Control Policy. The Access Control Policy page appears.

Step 2: Click the edit icon next to the access control policy configured for intrusion inspection using access control rules.

Step 3: Click the edit icon next to the rule you want to view. The access control rule editor appears.

Step 4: Verify that the rule action is set to Interactive Block or Interactive Block with reset.

Step 5: Select the Inspection tab. The Inspection tab appears.

Step 6: Verify that a system-provided or custom intrusion policy has been selected.

Note: An access control policy can have multiple access control rules associated with intrusion policies.
---------------------------------------------------
Verify that the ASA is configured to redirect all traffic to the FirePOWER service module.

Step 1: Verify that the FirePOWER service module has been deployed in inline mode as shown in the example below.

policy-map global_policy
class FIREPOWER_SFR
sfr fail-open

Step 2: Verify that all traffic is redirected.

access-list FIREPOWER_REDIRECT extended permit ip any any
…
…
…
class-map FIREPOWER_SFR
match access-list FIREPOWER_REDIRECT

Note: Inbound and outbound traffic that is allowed by the ASA firewall is forwarded to the FirePOWER module. If the Cisco ASA FirePOWER module is configured in inline mode, the packet is inspected and dropped if it does not conform to access control policies. If the packet is compliant with access control policies, it is sent back to the ASA firewall for processing.

If the ASA is not configured to block inbound traffic containing unauthorized activities or conditions, this is a finding.

Check Content Reference

M

Target Key

5341