OpenControls Logo

STIG Viewer

STIGViewer Support

The Cisco ASA must be configured to filter inbound traffic on all external interfaces.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-239865CASA-FW-000230SV-239865r991797_ruleCCI-002403medium
Description
Unrestricted traffic to the trusted networks may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth and other resources. Firewall filters control the flow of network traffic, ensure the flow of traffic is only allowed from authorized sources to authorized destinations. Networks with different levels of trust (e.g., the Internet) must be kept separated.
STIGDate
Cisco ASA Firewall Security Technical Implementation Guide2024-06-06

Related Frameworks

2 mappings across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CLD-03Cloud Infrastructure Security Subnet
0.50
NET-03Boundary Protection
0.50
NET-03.8Separate Subnet for Connecting to Different Security Domains
0.50
NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NET-06.1Security Management Subnets
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (11) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(2)Protection of Confidentiality and Integrity Using Encryption
1.00
AC-3Access Enforcement
1.00
CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00

+1 more (top 10 by confidence shown)

CCI2 mappings
CCI-002403
1.00
CCI-004891
1.00

Details

Check Text (C-239865r991797_chk)

Review the ASA configuration to verify that it is filtering inbound traffic on all external interfaces. access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.2 eq www access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.2 eq https access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.3 eq ftp access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.3 eq ftp-data access-list OUTSIDE_2_DMZ extended deny ip any any log … … … access-group OUTSIDE_2_DMZ in interface OUTSIDE If the ASA is not configured to filter inbound traffic on all external interfaces, this is a finding.

Fix Text (F-43057r665880_fix)

Step 1: Configure the ACL to allow specific inbound traffic. ASA(config)# access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.2 eq www ASA(config)# access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.2 eq https ASA(config)# access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.3 eq ftp ASA(config)# access-list OUTSIDE_2_DMZ extended permit tcp any host 10.1.33.3 eq ftp-data ASA(config)# access-list OUTSIDE_2_DMZ extended deny ip any any log Step 2: Apply the ACL inbound to the external interface. ASA(config)# access-group OUTSIDE_2_DMZ in interface OUTSIDE