The ALG must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-204954 | SRG-NET-000202-ALG-000124 | SV-204954r1137551_rule | CCI-001109 | medium |
| Description | ||||
| A deny-all, permit-by-exception network communications traffic policy ensures that only those connections which are essential and approved are allowed. As a managed interface, the ALG must block all inbound and outbound network communications traffic to the application being managed and controlled unless a policy filter is installed to explicitly allow the traffic. The allow policy filters must comply with the site's security policy. A deny all, permit by exception network communications traffic policy ensures that only those connections which are essential and approved, are allowed. This requirement applies to both inbound and outbound network communications traffic. All inbound and outbound traffic for which the ALG is acting as an intermediary or proxy must be denied by default. This requirement also applies to Zero Trust initiatives. | ||||
| STIG | Date | |||
| Application Layer Gateway Security Requirements Guide | 2025-09-15 | |||
Related Frameworks
1 mapping across 4 frameworks
Related Frameworks
SCF0 mappings
No source states a mapping between these directly.
Also reachable in 3 hops (1) 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.
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects
NIST 800-530 mappings
No source states a mapping between these directly.
Also reachable in 2 hops (6) 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.
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R1our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R1intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
NIST 800-1710 mappings
No source states a mapping between these directly.
Also reachable in 3 hops (1) 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.
3.13.6
1.00
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- NIST SP 800-171 Rev 2, Appendix DRev 2 (Feb 2020, errata Jan 2021)equal to(normalised)
CCI1 mapping
CCI-001109
1.00
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
Details
Check Text (C-204954r1137551_chk)
Verify the ALG denies network communications traffic by default and allows network communications traffic by exception on both inbound and outbound interfaces.
If the ALG does not deny network communications traffic by default and allow network communications traffic by exception on both inbound and outbound interfaces, this is a finding.
Fix Text (F-5222r395996_fix)
Configure the ALG to deny network communications traffic by default and allow network communications traffic by exception on both inbound and outbound interfaces.