5G; Security architecture and procedures for 5G System (3GPP TS 33.501 version 15.5.0 Release 15)

RTS/TSGS-0333501vf50

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Status
Published
Publication Date
01-Jul-2019
Technical Committee
Current Stage
12 - Completion
Completion Date
02-Jul-2019
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ETSI TS 133 501 V15.5.0 (2019-07) - 5G; Security architecture and procedures for 5G System (3GPP TS 33.501 version 15.5.0 Release 15)
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ETSI TS 133 501 V15.5.0 (2019-07)
TECHNICAL SPECIFICATION
5G;
Security architecture and procedures for 5G System
(3GPP TS 33.501 version 15.5.0 Release 15)
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3GPP TS 33.501 version 15.5.0 Release 15 1 ETSI TS 133 501 V15.5.0 (2019-07)
Reference
RTS/TSGS-0333501vf50
Keywords
5G,SECURITY
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3GPP TS 33.501 version 15.5.0 Release 15 2 ETSI TS 133 501 V15.5.0 (2019-07)
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3GPP TS 33.501 version 15.5.0 Release 15 3 ETSI TS 133 501 V15.5.0 (2019-07)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ........................................................................................................................................................... 12

1 Scope ...................................................................................................................................................... 13

2 References .............................................................................................................................................. 13

3 Definitions and abbreviations ................................................................................................................. 15

3.1 Definitions ........................................................................................................................................................ 15

3.2 Abbreviations ................................................................................................................................................... 19

4 Overview of security architecture .......................................................................................................... 20

4.1 Security domains .............................................................................................................................................. 20

4.2 Security entity at the perimeter of the 5G Core network .................................................................................. 21

4.3 Security entities in the 5G Core network .......................................................................................................... 21

5 Security requirements and features ........................................................................................................ 21

5.1 General security requirements .......................................................................................................................... 21

5.1.1 Mitigation of bidding down attacks ............................................................................................................ 21

5.1.2 Authentication and Authorization ............................................................................................................... 21

5.1.3 Requirements on 5GC and NG-RAN related to keys ................................................................................. 22

5.2 Requirements on the UE ................................................................................................................................... 22

5.2.1 General ........................................................................................................................................................ 22

5.2.2 User data and signalling data confidentiality .............................................................................................. 22

5.2.3 User data and signalling data integrity ........................................................................................................ 23

5.2.4 Secure storage and processing of subscription credentials ......................................................................... 23

5.2.5 Subscriber privacy ...................................................................................................................................... 23

5.3 Requirements on the gNB ................................................................................................................................ 24

5.3.1 General ........................................................................................................................................................ 24

5.3.2 User data and signalling data confidentiality .............................................................................................. 24

5.3.3 User data and signalling data integrity ........................................................................................................ 25

5.3.4 Requirements for the gNB setup and configuration .................................................................................... 25

5.3.5 Requirements for key management inside the gNB .................................................................................... 25

5.3.6 Requirements for handling user plane data for the gNB ............................................................................. 26

5.3.7 Requirements for handling control plane data for the gNB ........................................................................ 26

5.3.8 Requirements for secure environment of the gNB ...................................................................................... 26

5.3.9 Requirements for the gNB F1 interfaces..................................................................................................... 26

5.3.10 Requirements for the gNB E1 interfaces .................................................................................................... 26

5.4 Requirements on the ng-eNB ........................................................................................................................... 27

5.5 Requirements on the AMF ............................................................................................................................... 27

5.5.1 Signalling data confidentiality .................................................................................................................... 27

5.5.2 Signalling data integrity .............................................................................................................................. 27

5.5.3 Subscriber privacy ...................................................................................................................................... 27

5.6 Requirements on the SEAF .............................................................................................................................. 27

5.7 Void .................................................................................................................................................................. 28

5.8 Requirements on the UDM ............................................................................................................................... 28

5.8.1 Generic requirements .................................................................................................................................. 28

5.8.2 Subscriber privacy related requirements to UDM and SIDF ...................................................................... 28

5.8a Requirements on AUSF .................................................................................................................................... 28

5.9 Core network security ...................................................................................................................................... 28

5.9.1 Trust boundaries ......................................................................................................................................... 28

5.9.2 Requirements on service-based architecture ............................................................................................... 28

5.9.2.1 Security Requirements for service registration, discovery and authorization ....................................... 28

5.9.2.2 NRF security requirements ................................................................................................................... 29

5.9.2.3 NEF security requirements .................................................................................................................... 29

5.9.3 Requirements for e2e core network interconnection security ..................................................................... 29

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3GPP TS 33.501 version 15.5.0 Release 15 4 ETSI TS 133 501 V15.5.0 (2019-07)

5.9.3.1 General .................................................................................................................................................. 29

5.9.3.2 Requirements for Security Edge Protection Proxy (SEPP) ................................................................... 30

5.9.3.3 Protection of attributes .......................................................................................................................... 30

5.10 Visibility and configurability ........................................................................................................................... 31

5.10.1 Security visibility ........................................................................................................................................ 31

5.10.2 Security configurability .............................................................................................................................. 31

5.11 Requirements for algorithms, and algorithm selection ..................................................................................... 31

5.11.1 Algorithm identifier values ......................................................................................................................... 31

5.11.1.1 Ciphering algorithm identifier values.................................................................................................... 31

5.11.1.2 Integrity algorithm identifier values ...................................................................................................... 31

5.11.2 Requirements for algorithm selection ......................................................................................................... 32

6 Security procedures between UE and 5G network functions ................................................................. 32

6.0 General ............................................................................................................................................................. 32

6.1 Primary authentication and key agreement ...................................................................................................... 33

6.1.1 Authentication framework .......................................................................................................................... 33

6.1.1.1 General .................................................................................................................................................. 33

6.1.1.2 EAP fra me wor k ..................................................................................................................................... 33

6.1.1.3 Granularity of anchor key binding to serving network.......................................................................... 34

6.1.1.4 Construction of the serving network name ............................................................................................ 34

6.1.1.4.1 Serving network name ..................................................................................................................... 34

6.1.1.4.2 Construction of the serving network name by the UE ..................................................................... 34

6.1.1.4.3 Construction of the serving network name by the SEAF ................................................................ 34

6.1.2 Initiation of authentication and selection of authentication method ........................................................... 35

6.1.3 Authentication procedures .......................................................................................................................... 36

6.1.3.1 Authentication procedure for EAP-AKA' ............................................................................................. 36

6.1.3.2 Authentication procedure for 5G AKA ................................................................................................. 38

6.1.3.2.0 5G AKA .......................................................................................................................................... 38

6.1.3.2.1 Void ................................................................................................................................................. 40

6.1.3.2.2 RES* verification failure in SEAF or AUSF or both ...................................................................... 40

6.1.3.3 Synchronization failure or MAC failure ............................................................................................... 41

6.1.3.3.1 Synchronization failure or MAC failure in USIM ........................................................................... 41

6.1.3.3.2 Synchronization failure recovery in Home Network ....................................................................... 41

6.1.4 Linking increased home control to subsequent procedures ........................................................................ 42

6.1.4.1 Introduction ........................................................................................................................................... 42

6.1.4.1a Linking authentication confirmation to Nudm_UECM_Registration procedure from AMF ................ 42

6.1.4.2 Guidance on linking authentication confirmation to Nudm_UECM_Registration procedure from

AMF ...................................................................................................................................................... 43

6.2 Key hierarchy, key derivation, and distribution scheme .................................................................................. 44

6.2.1 Key hierarchy .............................................................................................................................................. 44

6.2.2 Key derivation and distribution scheme ...................................................................................................... 46

6.2.2.1 Keys in network entities ........................................................................................................................ 46

6.2.2.2 Keys in the UE ...................................................................................................................................... 47

6.2.3 Handling of user-related keys ..................................................................................................................... 49

6.2.3.1 Key setting ............................................................................................................................................ 49

6.2.3.2 Key identification .................................................................................................................................. 49

6.2.3.3 Key lifetimes ......................................................................................................................................... 50

6.3 Security contexts .............................................................................................................................................. 51

6.3.1 Distribution of security contexts ................................................................................................................. 51

6.3.1.1 General .................................................................................................................................................. 51

6.3.1.2 Distribution of subscriber identities and security data within one 5G serving network domain ........... 51

6.3.1.3 Distribution of subscriber identities and security data between 5G serving network domains ............. 51

6.3.1.4 Distribution of subscriber identities and security data between 5G and EPS serving network

domains ................................................................................................................................................. 51

6.3.2 Multiple registrations in same or different serving networks ..................................................................... 52

6.3.2.0 General .................................................................................................................................................. 52

6.3.2.1 Multiple registrations in different PLMNs ............................................................................................ 52

6.3.2.2 Multiple registrations in the same PLMN ............................................................................................. 52

6.4 NAS security mechanisms ................................................................................................................................ 52

6.4.1 General ........................................................................................................................................................ 52

6.4.2 Security for multiple NAS connections ...................................................................................................... 52

6.4.2.1 Multiple active NAS connections with different PLMNs ..................................................................... 52

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3GPP TS 33.501 version 15.5.0 Release 15 5 ETSI TS 133 501 V15.5.0 (2019-07)

6.4.2.2 Multiple active NAS connections in the same PLMN's serving network ............................................. 53

6.4.3 NAS integrity mechanisms ......................................................................................................................... 54

6.4.3.0 General .................................................................................................................................................. 54

6.4.3.1 NAS input parameters to integrity algorithm ........................................................................................ 54

6.4.3.2 NAS integrity activation ....................................................................................................................... 54

6.4.3.3 NAS integrity failure handling .............................................................................................................. 54

6.4.4 NAS confidentiality mechanisms ............................................................................................................... 55

6.4.4.0 General .................................................................................................................................................. 55

6.4.4.1 NAS input parameters to confidentiality algorithm .............................................................................. 55

6.4.4.2 NAS confidentiality activation .............................................................................................................. 55

6.4.5 Handling of NAS COUNTs ........................................................................................................................ 55

6.4.6 Protection of initial NAS message .............................................................................................................. 55

6.4.7 Security aspects of SMS over NAS ............................................................................................................ 57

6.5 RRC security mechanisms ................................................................................................................................ 57

6.5.1 RRC integrity mechanisms ......................................................................................................................... 57

6.5.2 RRC confidentiality mechanisms ............................................................................................................... 57

6.6 UP security mechanisms .................................................................................................................................. 57

6.6.1 UP security policy ....................................................................................................................................... 57

6.6.2 UP security activation mechanism .............................................................................................................. 58

6.6.3 UP confidentiality mechanisms .................................................................................................................. 60

6.6.4 UP integrity mechanisms ............................................................................................................................ 60

6.7 Security algorithm selection, key establishment and security mode command procedure ............................... 60

6.7.1 Procedures for NAS algorithm selection .................................................................................................... 60

6.7.1.1 Initial NAS security context establishment ........................................................................................... 60

6.7.1.2 AMF change .......................................................................................................................................... 60

6.7.2 NAS security mode command procedure ................................................................................................... 60

6.7.3 Procedures for AS algorithm selection ....................................................................................................... 62

6.7.3.0 Initial AS security context establishment .............................................................................................. 62

6.7.3.1 Xn-handover.......................................................................................................................................... 62

6.7.3.2 N2-handover.......................................................................................................................................... 63

6.7.3.3 Intra-gNB-CU handover/intra-ng-eNB handover.................................................................................. 63

6.7.3.4 Transitions from RRC_INACTIVE to RRC_CONNECTED states ..................................................... 63

6.7.3.5 RNA Update procedure ......................................................................................................................... 64

6.7.3.6 Algorithm negotiation for unauthenticated UEs in LSM ...................................................................... 64

6.7.4 AS security mode command procedure ...................................................................................................... 64

6.8 Security handling in state transitions ................................................................................................................ 66

6.8.1 Key handling at connection and registration state transitions ..................................................................... 66

6.8.1.1 Key handling at transitions between RM-DEREGISTERED and RM-REGISTERED states .............. 66

6.8.1.1.0 General ............................................................................................................................................ 66

6.8.1.1.1 Transition from RM-REGISTERED to RM-DEREGISTERED ..................................................... 66

6.8.1.1.2 Transition from RM-DEREGISTERED to RM-REGISTERED ..................................................... 67

6.8.1.1.2.1 General ....................................................................................................................................... 67

6.8.1.1.2.2 Full native 5G NAS security context available .......................................................................... 67

6.8.1.1.2.3 Full native 5G NAS security context not available .................................................................... 68

6.8.1.1.2.4 UE registration over a second access type to the same AMF .................................................... 68

6.8.1.2 Key handling at transitions between CM-IDLE and CM-CONNECTED states ................................... 69

6.8.1.2.0 General ............................................................................................................................................ 69

6.8.1.2.1 Transition from CM-IDLE to CM-CONNECTED .......................................................................... 69

6.8.1.2.2 Establishment of keys for cryptographically protected radio bearers in 3GPP access .................... 69

6.8.1.2.3 Establishment of keys for cryptographically protected traffic in non-3GPP access ........................ 70

6.8.1.2.4 Transition from CM-CONNECTED to CM-IDLE ..................................................................

...

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