# MA-04 Nonlocal Maintenance

NIST SP 800-53 control. Family: MA Maintenance. Function: preventative. Baselines: low, moderate, high. Mapping licence: CC BY-SA 4.0.

Statement: a. Approve and monitor nonlocal maintenance and diagnostic activities; b. Allow the use of nonlocal maintenance and diagnostic tools only as consistent with organizational policy and documented in the security plan for the system; c. Employ strong authentication in the establishment of nonlocal maintenance and diagnostic sessions; d. Maintain records for nonlocal maintenance and diagnostic activities; and e. Terminate session and network connections when nonlocal maintenance is completed.
Guidance: Nonlocal maintenance and diagnostic activities are conducted by individuals who communicate through either an external or internal network. Local maintenance and diagnostic activities are carried out by individuals who are physically present at the system location and not communicating across a network connection. Authentication techniques used to establish nonlocal maintenance and diagnostic sessions reflect the network access requirements in IA-02. Strong authentication requires authenticators that are resistant to replay attacks and employ multi-factor authentication. Strong authenticators include PKI where certificates are stored on a token protected by a password, passphrase, or biometric. Enforcing requirements in MA-04 is accomplished, in part, by other controls. [SP 800-63B] provides additional guidance on strong authentication and authenticators.

## Enhancements (6)
- MA-04(01) Logging and Review
- MA-04(03) Comparable Security and Sanitization. Baselines: high
- MA-04(04) Authentication and Separation of Maintenance Sessions
- MA-04(05) Approvals and Notifications
- MA-04(06) Cryptographic Protection
- MA-04(07) Disconnect Verification
Withdrawn by NIST: MA-04(02) (now in MA-01 and MA-04).
Each enhancement's statement: /api/v1/controls/MA-04?fields=enhancements

## Patterns that use it (5)
- Important (2): SP-002 Server Module; SP-023 Industrial Control Systems
- Standard (3): SP-001 Client Module; SP-008 Public Web Server Pattern; SP-051 Tokenised Asset Security Architecture (draft)

## Clauses by framework (23 frameworks)
- iso_27001_2022: A.7.13. OSA's own, not in NIST's crosswalk: A.7.13
- iso_27002_2022: 7.13
- cobit_2019: DSS01
- bsi_grundschutz: OPS.1.2.5
- anssi: Hygiene.16, Hygiene.24, Hygiene.28, Hygiene.34, SecNumCloud.13.4
- osfi_b13: B-13.2.3, B-13.3.2
- finma_circular: IV.A(28), IV.B.d(59), IV.C(62)
- gdpr: Art.32(1)(a), Art.32(1)(b)
- dora: Art.9(4)(a), Art.9(4)(c)
- bio2: 7.13
- rbi_csf: Annex1.7, ITGRCA.20
- fisc: FISC.F3
- mlps_2: 8.1.10.2
- dnb_good_practice: DNB.18.2
- cbe_csf: CTO-10
- cbn_csf: Part3.3
- bot_cyber: Ch10.1
- cpmi_pfmi: CG.PR
- ecb_croe: CROE.2.3.4
- sebi_cscrf: PR.MA
- cmmc_2: MA
- nrc_73_54: RG5.71-B-MA
- pci_pts: K
OSA's mapping for iso_27001_2022 takes NIST's published crosswalk as its base. A clause not marked as OSA's own is in that crosswalk.

## More
- This control as JSON, with guidance and ATT&CK techniques: /api/v1/controls/MA-04
- Clauses only: /api/v1/controls/MA-04?fields=mappings
- Page for people: /controls/ma-04/