A new Request for Comments is now available in online RFC libraries.
RFC 5393
Title: Addressing an Amplification Vulnerability in
Session Initiation Protocol (SIP) Forking Proxies
Author: R. Sparks, Ed., S. Lawrence,
A. Hawrylyshen, B. Campen
Status: Standards Track
Date: December 2008
Mailbox: [email protected],
[email protected],
[email protected],
[email protected]
Pages: 20
Characters: 48722
Updates: RFC3261
I-D Tag: draft-ietf-sip-fork-loop-fix-08.txt
URL: http://www.rfc-editor.org/rfc/rfc5393.txt
This document normatively updates RFC 3261, the Session Initiation
Protocol (SIP), to address a security vulnerability identified in SIP
proxy behavior. This vulnerability enables an attack against SIP
networks where a small number of legitimate, even authorized, SIP
requests can stimulate massive amounts of proxy-to-proxy traffic.
This document strengthens loop-detection requirements on SIP proxies
when they fork requests (that is, forward a request to more than one
destination). It also corrects and clarifies the description of the
loop-detection algorithm such proxies are required to implement.
Additionally, this document defines a Max-Breadth mechanism for
limiting the number of concurrent branches pursued for any given
request. [STANDARDS TRACK]
This document is a product of the Session Initiation Protocol Working Group of
the IETF.
This is now a Proposed Standard Protocol.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements. Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol. Distribution of this memo is unlimited.
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