Home > CAPEC List > CAPEC-326: TCP Initial Window Size Probe (Version 2.10)  

CAPEC-326: TCP Initial Window Size Probe

 
TCP Initial Window Size Probe
Definition in a New Window Definition in a New Window
Attack Pattern ID: 326
Abstraction: Detailed
Status: Stable
Completeness: Complete
Presentation Filter:
+ Summary

This OS fingerprinting probe checks the initial TCP Window size. TCP stacks limit the range of sequence numbers allowable within a session to maintain the "connected" state within TCP protocol logic. The initial window size specifies a range of acceptable sequence numbers that will qualify as a response to an ACK packet within a session. Various operating systems use different Initial window sizes. The initial window size can be sampled by establishing an ordinary TCP connection.

+ Target Attack Surface

Target Attack Surface Description

Targeted OSI Layers: Transport Layer

Target Attack Surface Localities

Server-side

Target Attack Surface Types: Host

Target Functional Services

Target Functional Service 1: None
Protocol 1: TCP
Protocol Header 1: TCP Header
Protocol Field NameProtocol Field DescriptionProtocol Operation CodeProtocol Data
Window
The 16 bit window indicates an allowed number of octets that the sender may transmit before receiving further permission.
ACK
Protocol Header 2: TCP Header
Protocol Field NameProtocol Field DescriptionProtocol Operation CodeProtocol Data
Acknowledgement Number
If the ACK control bit is set this field contains the value of the next sequence number the sender of the segment is expecting to receive. Once a connection is established this is always sent.
ACK
Related Protocol: Internet Protocol
Relationship Type
Uses Protocol
+ Attack Prerequisites
  • The ability to monitor and interact with network communications.

    Access to at least one host, and the privileges to interface with the network interface card.

+ Typical Severity

Low

+ Typical Likelihood of Exploit

Likelihood: Medium

+ Resources Required

A tool capable of sending and receiving packets from a remote system.

+ Attack Motivation-Consequences
ScopeTechnical ImpactNote
Confidentiality
Read application data
Confidentiality
Access_Control
Authorization
Bypass protection mechanism
Hide activities
+ References
[R.326.1] [REF-20] Stuart McClure, Joel Scambray and George Kurtz. "Hacking Exposed: Network Security Secrets & Solutions". Chapter 2: Scanning, pg. 56. 6th Edition. McGraw Hill. 2009.
[R.326.2] [REF-21] Defense Advanced Research Projects Agency Information Processing Techniques Office and Information Sciences Institute University of Southern California. "RFC793 - Transmission Control Protocol". Defense Advanced Research Projects Agency (DARPA). September 1981. <http://www.faqs.org/rfcs/rfc793.html>.
[R.326.3] [REF-22] Gordon "Fyodor" Lyon. "Nmap Network Scanning: The Official Nmap Project Guide to Network Discovery and Security Scanning". Chapter 8. Remote OS Detection. 3rd "Zero Day" Edition,. Insecure.com LLC. 2008.
+ Content History
Submissions
SubmitterOrganizationDateSource
CAPEC Content TeamThe MITRE Corporation2014-06-23Internal_CAPEC_Team
Modifications
ModifierOrganizationDateCommentsSource
CAPEC Content TeamThe MITRE Corporation2017-05-01Updated Attack_Motivation-Consequences, Attack_Prerequisites, Related_Attack_Patterns, Resources_Required, Typical_Likelihood_of_ExploitInternal
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Page Last Updated or Reviewed: May 01, 2017