CAPEC-322: TCP (ISN) Greatest Common Divisor Probe
This OS fingerprinting probe sends a number of TCP SYN packets to an open port of a remote machine. The Initial Sequence Number (ISN) in each of the SYN/ACK response packets is analyzed to determine the smallest number that the target host uses when incrementing sequence numbers. This information can be useful for identifying an operating system because particular operating systems and versions increment sequence numbers using different values. The result of the analysis is then compared against a database of OS behaviors to determine the OS type and/or version.
Last updated
Overview
CAPEC-322 (TCP (ISN) Greatest Common Divisor Probe) is a detailed-level attack pattern catalogued by MITRE in the Common Attack Pattern Enumeration and Classification (CAPEC). It describes a recurring method attackers use to exploit software weaknesses.
What the attacker needs
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.
Resources required
- A tool capable of sending and receiving packets from a remote system.
Consequences
What a successful CAPEC-322 attack can achieve.
Read Data
Affects: Confidentiality
Bypass Protection Mechanism, Hide Activities
Affects: Confidentiality, Access Control, Authorization