Wireshark mailing list archives
Re: Wireshark in Network - Windows/Linux
From: Hobbe <my1listmail () gmail com>
Date: Tue, 16 Mar 2010 11:07:04 +0100
Hi None of them supports detecting a sniffer, they all detect that the network card is in promiscous mode. That a network card is in promiscous mode only means that there is a chance of that machine could be used as a sniffer, but it is not the same as it is a sniffer device. To find sniffers and such you would have to run a software inventory program that checks out what software does exist in the machines. Then you can say: "ok we have found sniffer software on the machines". The different tools do different things so do a search for them and se wich one/ones would help you find out what you want. HTH Hobbe 2010/3/16 Karthik Balaguru <karthikbalaguru79 () gmail com>
On Sun, Mar 14, 2010 at 4:45 PM, Hobbe <my1listmail () gmail com> wrote:As far as i know there is no way to detect a sniffer in a network,howeverthere are some ways that can detect network cards in promiscuous mode,toolsfor this could be antisniff, neped, promgryui, sniffer-detect and so on. They all do NOT detect a sniffer "per se", they detect that a networkcardis in promiscuous mode wich is a strong indicator that there is asniffer. Thx for your reply. antisniff, neped, promgryui, sniffer-detect - Do they support detection of sniffer in both windows and linux ? Thought of checking it with you before actually going in for analyzing those. Any ideas ?This does not however show the sniffers used with SPAN or RSPAN ports in switches since those ports are shutdown for outgoing traffic from the sniffer and only mirrors the traffic on the ports choosen. HTH Hobbe 2010/3/13 Karthik Balaguru <karthikbalaguru79 () gmail com>On Wed, Mar 10, 2010 at 12:03 AM, Guy Harris <guy () alum mit edu> wrote:On Mar 9, 2010, at 8:35 AM, Karthik Balaguru wrote:How to determine the presence of wireshark in a network ? Are there any specific packet types exchanged while it is present in thenetworkso that it can be used to determine its presence in the network ? Any specific tool to identify its presence in either Windows or Linux ?There is no Wireshark-specific network protocol that it and only it uses. If you do a Web search for detecting sniffers you can find some techniques that, although not *guaranteed* to find programs that capture network packets, such as Wireshark (and tcpdumpandsnoop and Microsoft Network Monitor and NetScout Sniffer andWildPackets{Ether,Token,Airo,Omni}Peek and...), can sometimes detect thoseprograms ona network. For example: http://www.securiteam.com/unixfocus/2EUQ8QAQME.html says How to detect other sniffers on the network Detecting other sniffers on other machines is very difficult(andsometimes impossible). But detecting whether one of the Linux machinesisdoing the sniffing is possible. This can be done by exploiting a weakness in the TCP/IP stack implementation of Linux. When Linux is in promiscuous mode, it will answer to TCP/IP packets sent to its IP address even if the MAC address on that packetiswrong (the standard behavior is that packets containing wrong MACaddresswill not be answered because the network interface will drop them).Interesting to know that Linux TCP/IP stack implementation answers to TCP/IP packets even if the MAC address on that packet is wrong(Promiscuous mode). But, Is this made intentionally in Linux to be different from standard behavior in helping the determination of presence of sniffer in network ? Any thoughts ?Therefore, sending TCP/IP packets to all the IP addresses onthesubnet, where the MAC address contains wrong information, will tellyouwhich machines are Linux machines in promiscuous mode (the answer fromthosemachines will be a RST packet) While this is far from being a perfect method, it can help discover suspicious activity on a network.Thx in advans, Karthik Balaguru___________________________________________________________________________Sent via: Wireshark-users mailing list <wireshark-users () wireshark org>Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe___________________________________________________________________________Sent via: Wireshark-users mailing list <wireshark-users () wireshark org Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribeThx in advans, Karthik Balaguru ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org ?subject=unsubscribe
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Current thread:
- Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 09)
- Re: Wireshark in Network - Windows/Linux Guy Harris (Mar 09)
- Re: Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 12)
- Re: Wireshark in Network - Windows/Linux Hobbe (Mar 14)
- Re: Wireshark in Network - Windows/Linux Ray Warren (Mar 15)
- Re: Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 15)
- Re: Wireshark in Network - Windows/Linux Hobbe (Mar 16)
- Re: Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 16)
- Re: Wireshark in Network - Windows/Linux Hobbe (Mar 18)
- Re: Wireshark in Network - Windows/Linux ronnie sahlberg (Mar 18)
- Re: Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 20)
- Re: Wireshark in Network - Windows/Linux bart sikkes (Mar 20)
- Re: Wireshark in Network - Windows/Linux Hobbe (Mar 20)
- Re: Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 21)
- Re: Wireshark in Network - Windows/Linux Phil Paradis (Mar 20)
- Re: Wireshark in Network - Windows/Linux Karthik Balaguru (Mar 12)
- Re: Wireshark in Network - Windows/Linux Guy Harris (Mar 09)
- Re: Wireshark in Network - Windows/Linux ronnie sahlberg (Mar 18)