The magic of ettercap
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This document summarizes the capabilities of the Ettercap tool, which can intercept and alter network traffic. It discusses how Ettercap can intercept passwords through sniffing protocols like FTP, intercept DNS requests to redirect to illegitimate IP addresses, and sniff SSL traffic by injecting its own unsigned certificate. Studies show that many users will ignore certificate warnings. The document provides examples of how Ettercap can be used for these purposes and discusses ways to potentially detect or prevent its use.
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Axoss Wireless Penetration Testing Services
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Este documento describe cómo realizar un ataque de suplantación de DNS (DNS spoofing) utilizando la herramienta de red Kali Linux. Explica que primero se instala Kali Linux y luego se abre la herramienta Websploit para acceder al módulo de red MFOD y configurar la IP falsa para redireccionar el tráfico de la víctima. Luego, se usa la herramienta Ettercap para escanear la red local, seleccionar la víctima y comenzar el ataque DNS spoofing redireccionando su tráfico a
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Cal Leeming discusses vulnerabilities in the auto provisioning systems of several VoIP phone vendors, including Yealink and Snom. He describes how remote attackers could potentially extract user credentials and provisioning information from devices without authentication by scanning the MAC address ranges and exploiting insecure auto provisioning servers. Leeming urges vendors to implement encryption of configuration files and other protections by default to prevent such attacks. He also provides recommendations for immediate protections providers can take and encourages the community to help test devices and provisioning systems to identify vulnerabilities.
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Join the CASC Wednesday April 30 for a Google+ hangout on the Heartbleed Bug. We’ll cover everything from what the bug does to how to tell if your site is at risk and how certificate authorities are responding.
Panel of CASC members:
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This document provides a summary of techniques that internet service providers (ISPs) can use to improve their security and resistance to attacks. It discusses preparing the network operations center (NOC) team through training, tools, and procedures. Key mitigation techniques discussed include securing network devices, establishing collaboration communities, implementing remote triggered black hole filtering, and gaining total network visibility through data collection and analysis.
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Virtual Labs: Sniffing
Consider what you have learned so far about Sniffing as you review the objectives and scenario below. Complete the lab that follows on EC-Council's website using the link below.
Objective
Sniffing is performed to collect basic information from the target and its network. It helps to find vulnerabilities and select exploits for an attack. It determines the network, system, and organizational information.
The objective of this lab is to make students learn to sniff a network and analyze packets for any attacks on the network. The primary objectives of this lab are to:
Sniff the network
Analyze incoming and outgoing packets
Troubleshoot the network for performance
Secure the network from attacks
Scenario
“Sniffing” is the process of monitoring and capturing data packets passing through a given network using software or hardware devices. There are two types of sniffing: passive and active.
Passive sniffing refers to sniffing on a hub-based network; active sniffing refers to sniffing on a switch-based network.
Although passive sniffing was predominant in earlier days, proper network-securing architecture has been implemented (switch-based network) to mitigate this kind of attack. However, it contains a few loopholes in switch-based network implementation that can open doors for an attacker to sniff network traffic.
Attackers hack the network using sniffers, where he/she mainly targets the protocols vulnerable to sniffing. Some of the protocols vulnerable to sniffing include HTTP, FTP, SMTP, POP, and so on. The sniffed traffic comprises FTP and Telnet passwords, chat sessions, email and web traffic, DNS traffic, and so on. Once attackers obtain such sensitive information, they might attempt to impersonate target user sessions.
Thus, it is essential to assess the security of the network’s infrastructure, find the loopholes in it and patch them up to ensure a secure network environment. So, as an ethical hacker/penetration tester, your duties include:
Implementing network auditing tools such as Wireshark, and Cain & Abel, etc. in an attempt to find loopholes in the network.
Using security tools such as PromqryUI to detect attacks on the network, and so on.
The lab this week will provide you with real-time experience in sniffing.
Week 6 Lab Assignment 1: Sniffing Passwords Using Auditing Tools
Lab Task:
The objective of this lab is to demonstrate sniffing to capture traffic from multiple interfaces and collect data from any network topology.
In this lab, you will learn how to:
Capture Passwords of Local Interface and
Capture traffic from Remote Interface
Lab Description:
Data traversing an HTTP channel is prone to MITM attacks, as it flows in plain-text format. Network administrators can use sniffers to troubleshoot network problems, examine security problems, and debug protocol implementations. However, an attacker can use tools such as Wireshark and sniffs the traffic flowing between the clien ...
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The magic of ettercap
- 2. Ettercap Intercepts traffic Alters traffic Does lots of scary things Has powerful (and easy to use) filtering language that allows for custom scripting Can be “unified” or “bridged”
- 4. Password Sniffer Ettercap has a powerful password sniffer, and can find and display passwords in following protocols: TELNET, FTP, POP, IMAP, rlogin, SSH1, ICQ, SMB, MySQL, HTTP, NNTP, X11, Napster, IRC, RIP, BGP, SOCKS 5, IMAP 4, VNC, LDAP, NFS, SNMP, Half-Life, Quake 3, MSN, YMSG
- 5. (show demo)
- 6. Dns Tampering Ettercap can intercept DNS requests, check against its own configuration, and reply back with an illegitimate IP Fake response occurs before the real response can reach the target, so the victim computer ignores it Can be done easily in “unified” mode, no bridging required
- 7. Dns Tampering • So what does this look like? Victim: where is youtube.com? Ettercap: do I have a record for this? If so, reply with an illegitimate IP address Victim: I received an answer to my request for www.youtube.com, so all is well Legit DNS Server: I know this record, replying with legit IP Victim: I just got another response for my request, but it’s already been fulfilled, so I’m ignoring this response
- 8. Dns Tampering • This attack is perfect for situations where bridging isn‟t possible • (perhaps the attacker doesn‟t have physical access that high up in the network) • Isn‟t foolproof though • SSL-protected websites will present certificate errors • If the line is fast enough, the legitimate DNS server can reply before Ettercap has had time to process and submit its own res
- 9. SSL Sniffing • Ettercap can sniff and modify SSL packets by sending an unsigned certificate to the victim
- 10. Carnegie Mellon Study (2010) In an online study conducted among 409 participants, the researchers found that the majority of respondents would ignore warnings about an expired Secure Sockets Layer (SSL) certificate. The more tech-savvy the user, the more likely they would be to ignore it, the study found. 50 percent of Firefox 2 users polled who could identify the term "expired security certificate," 71 percent said they would ignore the warning. Of the 59 percent of Firefox 2 users who understood the significance of a "domain mismatch" warning, 19 percent said they would ignore the hazard. The Carnegie Mellon team conducted a second study, with 100 participants and under lab conditions. The participants were shown an invalid certificate warning when they navigated to a bank Web site. 69 percent of technologically savvy Firefox 2 users ignored an expired certificate warning from their bank. * Taken from http://news.cnet.com/8301-1009_3-10297264-83.html
- 11. ISU WebCT Case Study Inyear 2009, the certificate for WebCT was not renewed before its expiration ITS was immediately inundated with calls and requests for support; employees walked users through how to ignore the certificate error The certificate remained invalid for two days Such problems train the average user to simply ignore these types of warnings “I‟ve seen this before, and they just told me to click ignore last time.”
- 12. SSL Sniffing What’s the take-away? • It’s easy to sniff SSL with an invalid certificate • People ignore SSL warnings • Most will continue onwards anyway Remember: if you encounter an invalid certificate, be careful and use your head!
- 13. Ways to stop it. To keep a static arp for the gateway To use tools like Arpwatch in the background To use arp_cop plugin of the ettercap.
- 14. Thank you and have fun with ettercap