Network scanning
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A network consists of 3 parts: IP addresses, services, and ports. An IP address has a network and host address determined by the subnet mask. Services are network protocols that link server and client applications, typically running on specific ports, though any service can run on any port. Ports allow different services to be available from one location, with common services using well-known ports. Network scanning includes host scanning to locate hosts, port scanning to determine services, and vulnerability scanning to find known flaws using signature-based tools like Nmap, Nessus, GFI LANguard, and SuperScan.
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NMAP
Nmap is a network exploration tool that collects information about target hosts including open ports, services, OS detection, and running scripts. It offers various host discovery techniques like ICMP ping, TCP and UDP ping to find active systems on the network. Once hosts are identified, nmap performs port scanning using TCP SYN, ACK, and UDP scans to determine open and closed ports. It can also detect services, versions, and OS on each host. Nmap scripts provide additional information gathering capabilities for vulnerabilities and exploits.
Port Scanning
Port scanning involves sending packets to ports on a target system to discover which ports are open and may be exploited. There are several common port scanning techniques like TCP connect scanning, SYN scanning, FIN scanning, and UDP scanning. Port scanners try to avoid detection by scanning slowly, spoofing packets, or fragmenting packets. Systems can detect port scans through signatures like many connections to different ports from the same source in a short time.
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Nmap is a free and open source tool for network discovery and security auditing. It was written by Fyodor and allows users to identify hosts on a network, determine services and operating systems running on them, and discover vulnerabilities. The document outlines the basic anatomy of a scan, describing the DNS lookup, ping, reverse DNS lookup, and scan steps. It also covers different scan types like TCP SYN, connect, ping, and UDP scans as well as useful options for excluding or including targets, specifying port numbers, and adjusting ping behavior. Later modules discuss operating system and version detection, stealth scanning techniques, timing options, and randomizing scans.
Nmap
Nmap is a free and open-source tool for network discovery and security auditing. It can be used to discover hosts and services on a computer network by scanning target hosts and performing port scanning, version detection, and OS detection. System administrators, network engineers, and auditors use Nmap for security auditing, compliance testing, asset management, and network/system inventory. While Nmap provides useful information for hardening network security, it can also be used maliciously for reconnaissance, so permission should be obtained before using it on networks.
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www.lifein01.com - for more info
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This can replace the use of acunetix and other paid version scanner.
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This document describes the methodology for conducting network penetration tests and web application penetration tests. For network penetration tests, it involves footprinting, scanning and enumeration, vulnerability analysis, exploitation, and reporting. The goal is to identify security vulnerabilities in the network that could be exploited by hackers. For web application tests, it analyzes the application's configuration, authentication, session management, authorization, data validation, web services, and produces a report of findings and recommendations. The overall goal is to evaluate the security of networks and web applications and provide remedies to identified vulnerabilities.
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[old] Network Performance Monitoring for DevOps and IT
Take a look at our updated Network Monitoring presentation in the link given below:
https://www.slideshare.net/Site24x7/network-final
Get comprehensive performance insights by monitoring critical network devices such as routers, switches and firewalls with Site24x7.
About Site24x7:
Site24x7 offers unified cloud monitoring for DevOps and IT operations. Monitor the experience of real users accessing websites and applications from desktop and mobile devices. In-depth monitoring capabilities enable DevOps teams to monitor and troubleshoot applications, servers and network infrastructure including private and public clouds. End user experience monitoring is done from 50+ locations across the world and various wireless carriers. For more information on Site24x7, please visit http://www.site24x7.com/.
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Network scanning is the process of gathering detailed information about targets on a network through complex reconnaissance techniques. It identifies active machines, operating systems, open ports and services. This enables attackers to profile organizations by discovering specific IP addresses, OSs, system architectures and services running on each computer. Common types of scanning include port scanning to identify open ports and services, network scanning to find active hosts and IP addresses, and vulnerability scanning to detect known weaknesses. The objectives of network scanning are to discover live hosts and open ports, identify OSs and applications to determine the best means of entry and exploit vulnerabilities. Nmap is a widely used security scanner that sends crafted packets to analyze responses and map networks by identifying hosts, ports, services, firewalls
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Practical White Hat Hacker Training - Vulnerability Detection
This presentation part of Prisma CSI's Practical White Hat Hacker Training v1
PRISMA CSI • Cyber Security and Intelligence www.prismacsi.com
This document can be shared or used by quoted and used for commercial purposes, but can not be changed. Detailed information is available at https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.
lecture5.pptx
The document discusses various phases of intrusion and techniques used by attackers:
1. Reconnaissance involves gathering information about the target through techniques like searching public databases, domain name records, and social engineering to map the network and discover vulnerabilities.
2. Scanning detects live machines, network topology, firewall configurations, applications, and vulnerabilities using tools like ping sweeps, traceroute, port scanning, and vulnerability scanners.
3. Gaining access exploits known vulnerabilities through buffer overflow attacks or by downloading exploits from hacker sites to compromise systems.
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The document discusses various network security tools, focusing on Nessus and Nmap. Nessus is an open-source vulnerability scanner that scans for vulnerabilities on networks and hosts. It provides reports and has both free and commercial versions. Nmap is a port scanner used to discover hosts and services on a network. The document explains how Nessus and Nmap can be used together for penetration testing, with Nmap performing initial scans and Nessus following up with more detailed vulnerability assessments. Example uses of the tools for internal network scanning and web application testing are also provided.
Slide Deck – Session 9 – FRSecure CISSP
Domain 4: Communication and Network Security - Review
Application Layer TCP/IP Protocols and Concepts, Layer 1 Network Cabling, LAN Technologies and Protocols, LAN Physical NetworkTopologies, WAN Technologies and Protocols, Network Devices and Protocols and Network Attacks
An Toan Thong Tin.pptx
Network scanning involves using various techniques to discover information about systems on a network such as identifying live hosts, open ports, operating systems, and running services. Common scanning methods include ICMP scanning to find live systems, TCP and UDP scans to detect open ports, banner grabbing to identify operating systems, and vulnerability scanning to find exploitable weaknesses. The results of scanning can help attackers profile the target network and locate potential entry points, while administrators can identify issues to address.
Scanning and Enumeration in Cyber Security.pptx
Scanning is the first phase of active hacking used to locate target systems and networks. It involves identifying live hosts, open ports, services, and OS details through techniques like ping sweeps, port scanning, banner grabbing, and vulnerability scanning. Enumeration occurs after scanning and is used to extract additional information like usernames, shares, and services. Specific enumeration techniques discussed include SNMP enumeration, which identifies device information by querying SNMP agents, and NetBIOS enumeration, which extracts Windows account and share details. Hacking tools mentioned that assist with scanning and enumeration include Nmap, SNMPUtil, DumpSec, and Hyena.
ManageEngine OpUtils Technical Overview
OpUtils is a Switch Port & IP Address Management software that helps network engineers manage their Switches and IP Address Space with ease.
Introduction to firewalls
Firewalls act as barriers between internal networks and external networks like the internet. They inspect incoming and outgoing network traffic and allow or block it based on preset rules. Firewalls can be implemented as standalone hardware devices or as software installed on computers and servers. They operate at both the network and application layers, using techniques like packet filtering, network address translation, and proxy services to monitor traffic and secure networks. Well-configured firewalls help protect networks from threats like port scans, viruses, and unauthorized access.
Namp
This document provides an overview of IP network scanning using the nmap tool. It describes how nmap can be used to discover active hosts on a network, identify open ports and services, determine operating system and software versions running on devices. Various scanning techniques are outlined, including host discovery, port scanning, and OS detection. The document also reviews common nmap commands and features such as target and port selection, different scan types, and using Nmap Scripting Engine (NSE) scripts.
ids.ppt
This document discusses intrusion detection and prevention systems. It defines intrusion, intrusion detection, and intrusion prevention. It describes the components and approaches of intrusion detection systems, including misuse detection, anomaly detection, host-based detection, and network-based detection. It compares the pros and cons of different approaches and deployment methods. It also discusses key metrics, architectures, and examples like Snort.
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Network scanning
- 1. Network Basics • A netowk consist of 3 parts 1. IP Address 2. Services 3. Port • IP Addresses – An address is comprised of two parts- a network address and a host address and determined by the subnet mask. – A simple example is 192.168.1.1 with a subnet mask of 255.255.255.0. • 192.168.1 is the network address (the 192.168.1.0 network) and .1 is a host address on that network. Oceanofwebs.com 1
- 2. • Services – The network protocol that listens for incoming connection requests and links the server application with the client – Typically each service runs on a set of specific ports – In actuality, any service can run on any port • Therefore, you should put only limited trust in port/service mappings. – Use an application scanner (service detection) to ensure find out what application is really running on that port. – Nmap has service detection 2Oceanofwebs.com
- 3. • Ports • A port is where a service listens for connections • Common services use common well-known ports • Could use any port as long as both the server and the client know which port to connect to • Ports allow different services to be available from one location or IP Address 3Oceanofwebs.com
- 4. Scanning • Types of scanning – Host (Ping) Scanning – Port Scanning – Vulnerability Scanning 4Oceanofwebs.com
- 5. Host Scanning • Hackers perform host scanning to locate and identify hosts on the network. • Usually by “pinging” a range of IP addresses. • Host which respond to pings may be targeted for attack. 5Oceanofwebs.com
- 6. Port Scanning • Hackers perform Port Scans to determine what services a host may be running. • By knowing the services the hacker can attempt attacks against known vulnerabilities in the service. • Port scans attempt to make initial connection to service running on a particular port number. • Port scans are invasive and are easily detected by Intrusion Detection and/or firewalls. 6Oceanofwebs.com
- 7. Vulnerability Scanning • What is vulnerability scanning? – Used to find known flaws within an application or network. – These scanning tools are typically signature based and can only find vulnerabilities that the tools know about. – Many good commercial and freeware tools are available. 7Oceanofwebs.com
- 8. Scanning Tools • Host & Port Scanning – Nmap • Vulnerability Scanning – GFI and Nessus 8Oceanofwebs.com
- 10. Scanning Tool - Nmap • The only port scanner you’ll need • Pros – FREE – Continually Updated – OS Detection and Service Detection – Support for both Windows and Unix • Cons – No standard Graphical User Interface LINK: (www.insecure.org) 10Oceanofwebs.com
- 11. Scanning Tool- SuperScan Pro’s – FREE download from Foundstone – Very stable, Fairly fast – Graphical User Interface Con’s – Windows version only – No stealth options, no Firewall Evasion – Service Detection/Application Mapping • LINK: (www.foundstone.com) 11Oceanofwebs.com
- 13. Scanning Tool – Nessus • Pros – Nessus is free – Large plugin or signature base – You can customize and create new plugins • Cons – Tenable took Nessus private (closed source) – Purchasing plans for new plugins – Shareware plug-ins are seven days behind LINK: (www.nessus.org) 13Oceanofwebs.com
- 14. Scanning Tool – GFI LANguard Network Security Scanner • Pros – Port Scanner, Enumeration, and Vulnerability Scanner – Many features such as SNMP and SQL brute force – Great for Windows networks • Cons – Lacks extensive signatures for other operating systems – Look to Nessus for scanning heterogeneous networks 14Oceanofwebs.com