Internet Engineering Task Force (IETF) H. Moustafa
Request for Comments: 5713 France Telecom
Category: Informational H. Tschofenig
ISSN: 2070-1721 Nokia Siemens Networks
S. De Cnodder
Alcatel-Lucent
January 2010
Security Threats and Security Requirements for the
Access Node Control Protocol (ANCP)
Abstract
The Access Node Control Protocol (ANCP) aims to communicate Quality
of Service (QoS)-related, service-related, and subscriber-related
configurations and operations between a Network Access Server (NAS)
and an Access Node (e.g., a Digital Subscriber Line Access
Multiplexer (DSLAM)). The main goal of this protocol is to allow the
NAS to configure, manage, and control access equipment, including the
ability for the Access Nodes to report information to the NAS.
This present document investigates security threats that all ANCP
nodes could encounter. This document develops a threat model for
ANCP security, with the aim of deciding which security functions are
required. Based on this, security requirements regarding the Access
Node Control Protocol are defined.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5713.
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RFC 5713 ANCP Threats January 2010
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................3
2. Specification Requirements ......................................3
3. System Overview and Threat Model ................................4
4. Objectives of Attackers .........................................7
5. Potential Attacks ...............................................7
5.1. Denial of Service (DoS) ....................................7
5.2. Integrity Violation ........................................8
5.3. Downgrading ................................................8
5.4. Traffic Analysis ...........................................8
5.5. Management Attacks .........................................8
6. Attack Forms ....................................................9
7. Attacks against ANCP ...........................................10
7.1. Dynamic Access-Loop Attributes ............................11
7.2. Access-Loop Configuration .................................12
7.3. Remote Connectivity Test ..................................14
7.4. Multicast .................................................14
8. Security Requirements ..........................................16
9. Security Considerations ........................................16
10. Acknowledgments ...............................................17
11. References ....................................................17
11.1. Normative References .....................................17
11.2. Informative References ...................................17
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RFC 5713 ANCP Threats January 2010
1. Introduction
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