The ALG providing content filtering must continuously monitor outbound communications traffic crossing internal security boundaries for unusual/unauthorized activities or conditions.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-205017 | SRG-NET-000391-ALG-000140 | SV-205017r831393_rule | CCI-002662 | medium |
| Description | ||||
| If outbound communications traffic is not continuously monitored, hostile activity may not be detected and prevented. Output from application and traffic monitoring serves as input to continuous monitoring and incident response programs. Internal monitoring includes the observation of events occurring on the network crosses internal boundaries at managed interfaces such as web content filters. Depending on the type of ALG, organizations can monitor information systems by monitoring audit activities, application access patterns, characteristics of access, content filtering, or unauthorized exporting of information across boundaries. Unusual/unauthorized activities or conditions may include large file transfers, long-time persistent connections, unusual protocols and ports in use, and attempted communications with suspected malicious external addresses. | ||||
| STIG | Date | |||
| Application Layer Gateway Security Requirements Guide | 2025-09-15 | |||
Related Frameworks
1 mapping across 5 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)2026.2equal to
NIST 800-530 mappings
No source states a mapping between these directly.
Also reachable in 2 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)
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.
3.14.6
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-002662
1.00
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
NIST CSF 2.00 mappings
No source states a mapping between these directly.
Also reachable in 4 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.
DE.CM-01
1.00
- DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- SCF Secure Traceability Relationship Mapping (STRM)2026.2equal to
- NIST OLIR Informative ReferenceOLIR 153 (2025-04-07)intersects(normalised)SCF Focal Document mapping (catalog)SCF 2026.2 focalintersects(normalised)
Details
Check Text (C-205017r831393_chk)
If the ALG does not perform content filtering as part of the traffic management functions, this is not applicable.
Verify the ALG continuously monitors outbound communications traffic for unusual or unauthorized activities or conditions.
If the ALG does not continuously monitor outbound communications traffic for unusual or unauthorized activities or conditions, this is a finding.
Fix Text (F-5285r396425_fix)
If the ALG performs content filtering as part of the traffic management functionality, configure the ALG to continuously monitor outbound communications traffic for unusual or unauthorized activities or conditions.