ETSI TS 133 250 V15.1.0 (2019-10)

LTE; Security assurance specification for the PGW network product class (3GPP TS 33.250 version 15.1.0 Release 15)

RTS/TSGS-0333250vf10

General Information

• Status: Published
• Publication Date: 08-Oct-2019
• Technical Committee: 3GPP SA 3 - Security
• Current Stage: 12 - Completion
• Completion Date: 09-Oct-2019

Standards Content (Sample)

ETSI TS 133 250 V15.1.0 (2019-10)






TECHNICAL SPECIFICATION
LTE;
Security assurance specification
for the PGW network product class
(3GPP TS 33.250 version 15.1.0 Release 15)

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3GPP TS 33.250 version 15.1.0 Release 15 1 ETSI TS 133 250 V15.1.0 (2019-10)



Reference
RTS/TSGS-0333250vf10
Keywords
LTE,SECURITY
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3GPP TS 33.250 version 15.1.0 Release 15 2 ETSI TS 133 250 V15.1.0 (2019-10)
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ETSI

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3GPP TS 33.250 version 15.1.0 Release 15 3 ETSI TS 133 250 V15.1.0 (2019-10)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions and abbreviations . 5
3.1 Definitions . 5
3.2 Abbreviations . 6
4 PGW-specific security requirements and related test cases . 6
4.1 Introduction . 6
4.2 PGW-specific security functional adaptations of requirements and related test cases . 6
4.2.1 Introduction. 6
4.2.2 Security functional requirements on the PGW deriving from 3GPP specifications and related test
cases . 6
4.2.2.1 Security functional requirements on the PGW deriving from 3GPP specifications – General
approach . 6
4.2.2.2 Per-user based packet filtering . 6
4.2.2.3 Charging ID Uniqueness . 7
4.2.2.4 TEID UNIQUENESS. 8
4.2.2.5 Mobility binding . 9
4.2.2.6 Inactive emergency PDN connection release . 10
4.2.3 Technical baseline. 11
4.2.3.1 Introduction . 11
4.2.3.2 Protecting data and information . 11
4.2.3.2.1 Protecting data and information – general . 11
4.2.3.2.2 Protecting data and information – unauthorized viewing . 11
4.2.3.2.3 Protecting data and information in storage . 11
4.2.3.2.4 Protecting data and information in transfer . 11
4.2.3.2.5 Logging access to personal data . 11
4.2.3.3 Protecting availability and integrity . 11
4.2.3.4 Authentication and authorization . 11
4.2.3.5 Protecting sessions . 11
4.2.3.5.1 Unpredictable GTP TEID . 11
4.2.3.6 Logging . 12
4.2.4 Operating systems . 13
4.2.5 Web servers . 13
4.2.6 Network devices . 13
4.2.6.1 Protection of Data and Information . 13
4.2.6.2 Protecting availability and integrity . 13
4.2.6.3 IP Address reallocation interval . 13
4.2.6.4 MS/UE-Mutual Access Prevention . 14
4.3 PGW-specific adaptations of hardening requirements and related test cases . 15
4.3.1 Introduction. 15
4.3.2 Technical baseline. 15
4.3.3 Operating systems . 15
4.3.4 Web servers . 15
4.3.5 Network devices . 15
4.3.5.1 Traffic separation . 15
4.3.5.2 User Plane Traffic Differentiation . 16
4.4 PGW-specific adaptations of basic vulnerability testing requirements and related test cases . 17
Annex A (informative): Change history . 18
History . 19

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3GPP TS 33.250 version 15.1.0 Release 15 4 ETSI TS 133 250 V15.1.0 (2019-10)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI

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3GPP TS 33.250 version 15.1.0 Release 15 5 ETSI TS 133 250 V15.1.0 (2019-10)
1 Scope
The present document contains requirements and test cases that are specific to the PGW network product class. It refers
to the Catalogue of General Security Assurance Requirements and formulates specific adaptions of the requirements
and test cases given there, as well as specifying requirements and test cases unique to the PGW network product class.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TR 41.001: "GSM Release specifications".
[3] 3GPP TS 33.117: "Catalogue of General Security Assurance Requirements".
[4] 3GPP TR 33.916: "Security assurance scheme for 3GPP network products for 3GPP network
product classes".
[5] 3GPP TS 33.401: "3GPP System Architecture Evolution (SAE); Security architecture".
[6] 3GPP TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal
Terrestrial Radio Access Network (E-UTRAN) access".
[7] 3GPP TS 33.102: "3G security; Security architecture".
[8] 3GPP TS 32.251: "Telecommunication management; Charging management; Packet Switched
(PS) domain charging".
[9] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[10] 3GPP TR 33.926: "Security Assurance Specification (SCAS) threats and critical assets in 3GPP
network product classes".
[11] 3GPP TS 33.402: "3GPP System Architecture Evolution (SAE); Security aspects of non-3GPP
accesses".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following
apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP
TR 21.905 [1].
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3GPP TS 33.250 version 15.1.0 Release 15 6 ETSI TS 133 250 V15.1.0 (2019-10)
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
3GPP TR 21.905 [1].

4 PGW-specific security requirements and related test
cases
4.1 Introduction
The structure of the present document is aligned with TS 33.117[3] such that the PGW-specific adaptation of a generic
requirement in 33.117[3], clause 4, can be always found in clause 4 of present document.
The text on pre-requisites for testing in clause 4.1.2 of TS 33.117 [3] applies also to the present document.
4.2 PGW-specific security functional adaptations of
requirements and related test cases
4.2.1 Introduction
4.2.2 Security functional requirements on the PGW deriving from 3GPP
specifications and related test cases
4.2.2.1 Security functional requirements on the PGW deriving from 3GPP
specifications – General approach
In addition to the requirements and test cases in TS 33.117[3], clause 4.2.2, a PGW shall satisfy the following:
It is assumed for the purpose of the present SCAS that a PGW conforms to all mandatory security-related provisions
pertaining to a PGW in:
- 3GPP TS 33.401[5]: "EPS security architecture";
- other 3GPP specifications that make reference to TS 33.401[5] or are referred to from TS 33.401[5] (e.g. TS
23.401 [6], TS 23.060[9], etc.);
- 3GPP TS 32.251[8]: " Packet Switched (PS) domain charging".
Since the PDN GW is the gateway which terminates the SGi interface, the security procedures pertaining to the PGW
are typically related to gateway functions. For example:
- Per-user based packet filtering (by e.g. deep packet inspection).
- Every IP-CAN bearer shall be assigned a unique identity number for billing purposes. (i.e. the Charging Id).
- The TEID is a unique identifier within one IP address of a logical node.
4.2.2.2 Per-user based packet filtering
Requirement Name: Per-user based packet filtering
Requirement Reference: TS 23.401 [6], clause 4.4.3.3
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3GPP TS 33.250 version 15.1.0 Release 15 7 ETSI TS 133 250 V15.1.0 (2019-10)
Requirement Description: This requirement is identical to per-user based packet filtering (by e.g. deep packet
inspection) as specified in TS 23.401, clause 4.4.3.3.
Threat References: TR 33.926 [10], clause B.2.3.1 Failure to assign unique TEID or Charging ID for a session.

Test Case:
Purpose:
Verify that PGW supports a Per-user based packet filtering.
Pre-Conditions:
- The tester has a privilege to configure the filtering policy on the PGW to make the PGW can filter the packets
per-user
- Some UE (e.g. UE1 and UE2) are registered on the PGW.
- The PGW can receive the packets from the UE1 and UE2.
- A network traffic analyser on the PGW (e.g. tcpdump) is available.
Execution Steps
1) The tester configures the different filtering policy for the UE1and the UE2 on the PGW, e.g. the PGW forwards
the packets from the UE1 to SGi and drops the packets from the UE2.
2) The tester sends the packets from the UE1 to the PGW.
3) The tester sends the packets from the UE2 to the PGW.
4) The tester checks the filtered packets using the network traffic analyser.
Expected Results:
The PGW can filter the packets per- user according the configured filtering policy, e.g. the PGW forwards the packets
from the UE1 to SGi in the step 2 and drops the packets from the UE2 in the step 3.
Expected format of evidence:
Evidence suitable for the interface, e.g. screenshot contains the operation results, pcap file demonstrating that the UE2’s
packets are correctly received but unavailable on the SGi interface while the UE1’s packets are correctly sent to SGi.
4.2.2.3 Charging ID Uniqueness
Requirement Name: Charging ID Uniqueness
Requirement Reference: TS 32.251 [8], clause 5.1.1
Requirement Description: "Every IP-CAN bearer shall be assigned a unique identity number for billing purposes. (i.e.
the Charging Id)" as specified in 3GPP TS 32.251 [8], clause 5.1.1.
Note: A charging ID is not assigned to more than one active IP-CAN bearers at the same time. The reuse of
Charging ID is possible after an IP-CAN session has been terminated and the Charging ID related to this
IP-CAN session has been released.
Threat References: TR 33.926 [10], clause B.2.5.1 Failure to assign unique TEID or Charging ID for a session

Test Case:
Purpose:
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3GPP TS 33.250 version 15.1.0 Release 15 8 ETSI TS 133 250 V15.1.0 (2019-10)
Verify that the Charging ID value set in the Information Element Bearer Context within a CreateSessionResponse is
unique.
Pre-Conditions:
Test environment with P-GW and S-GW, PCRF. PCRF and S-GW may be real nodes
...