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ICMP Attacks against TCP (RFC5927) Disclosure Number: IPCOM000197393D
Original Publication Date: 2010-Jul-01
Included in the Prior Art Database: 2010-Jul-07
Document File: 72 page(s) / 88K

Publishing Venue

Internet Society Requests For Comment (RFCs)

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ICMP [RFC0792] [RFC4443] is a fundamental part of the TCP/IP protocol suite, and is used mainly for reporting network error conditions. However, the current specifications do not recommend any kind of validation checks on the received ICMP error messages, thus allowing a variety of attacks against TCP [RFC0793] by means of ICMP, which include blind connection-reset, blind throughput-reduction, and blind performance-degrading attacks. All of these attacks can be performed even when the attacker is off-path, without the need to sniff the packets that correspond to the attacked TCP connection.

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Internet Engineering Task Force (IETF)                           F. Gont Request for Comments: 5927                                       UTN/FRH Category: Informational                                        July 2010 ISSN: 2070-1721

                         ICMP Attacks against TCP


   This document discusses the use of the Internet Control Message    Protocol (ICMP) to perform a variety of attacks against the    Transmission Control Protocol (TCP).  Additionally, this document    describes a number of widely implemented modifications to TCP's    handling of ICMP error messages that help to mitigate these issues.

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

 Gont                          Informational                     [Page 1]
 RFC 5927                ICMP Attacks against TCP               July 2010

 Copyright Notice

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   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( 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.

   This document may contain material from IETF Documents or IETF    Contributions published or made publicly available before November    10, 2008.  The person(s) controlling the copyright in some of this    material may not have granted the IETF Trust the right to allow    modifications of such material outside the IETF Standards Process.    Without obtaining an adequate license from the person(s) controlling    the copyright in such materials, this document may not be modified    outside the IETF Standards Process, and de...