Sunday, August 10. 2008Port Scanning the Internet
Today fyodor/nmap gave a talk at defcon ("Nmap: Scanning the Internet"). It was one of the better if not the best presentation at defcon for me. Fyodor presents his research with a lot of charm, fun and motivation.
Nmap can now be used to scan the entire Internet. Before joining THC I was doing research for Team-Teso. In 2000 one of our problems at Teso was that many script kiddies entered the arena and started setting up DDoS hosts and owning like mad. Hacking became mainstream. At Teso we did not like script kiddies and we abhorred those doing DDoS. A small group of Teso and some friends reverse engineered the backdoors and started scanning for them. Our objective was to discourage script kiddies and stop DDoS attacks (by removing the DDoS agents). Techniques We developed a new scanner (called 'bscan', not published but a handful of people had it) that was capable of scanning the internet. The main features of bscan were: - Raw SYN scanner. Full TCP/IP stack in userland. - Using ghost IP and ghost MAC (untraceable) - Modular. We developed loadable modules for telnet handshake, bind, http (HEAD / HTTP/1.0), ... - Sending out 50.000 or more syn packets per second. - Running on linux, sunos/solaris and bsd. In short the scanner was capable of scanning the entire Internet (0.0.0.0 - 239.255.255.255). The scanner retrieved all Web Server versions or telnet banners within hours. Fyodor's nmap was developed for a different reason. The features of nmap are far superior to bscan. Bscan was a tool and nmap is a professional application. Results All this is history now and I think that 7 years after the development the time has come to share some of the stuff that we learned while scanning the Internet:
The scanner was usually started on 5-10 Internet hosts in parallel. A big thanks at this point to the IT Administrators of the various universities in Germany who let us use their hosts for scanning (legally!). A typical TCP port scan of the Internet took between 8-16 hours. Stories There was a nice side effect of cleaning the internet from script kiddies and their backdoors: Teso had a full list of all server versions of all hosts on the Internet. No longer had team teso to scan for vulnerable hosts. We just looked them up in our log files. One day one of the German hackers who helped Teso came home drunk and decided to start another scan for a script kiddie backdoor that was running on TCP port 33645. He initiated a scan and set source port to 443 and destination port to 33645. The morning after (and being sober again) he saw that various security mailing lists discussed a new 0-day vulnerability against HTTPS (port 443). Apparently someone was scanning with massive speed the HTTPS ports on the Internet. He looked again of what scan he started the night before: He mistakenly swapped source and destination port while drunk and scanned for port 443 instead for port 33465. These mails can still be found on the archives of various mailing lists around xmas 2002. Lesson learned: Do not drink & hack. We were not the only ones who scanned the Internet. We heart of an Israeli research group who did it in 1998. In 2002/2003 Dan Kaminsky published another tool called scanrand. His tool is public. Try it. Final Notes These days bscan is old and not up to date anymore. Whatever you do make sure it's legal and does not cause trouble to other people. regards, someone Trackbacks
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Wow, this was seriously over my head but thanks for putting it together!
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There are hosts on the Internet that keep sending ACK packets for hours even if you send back FIN, RST or ICMP error messages. They just wont stop sending!
Sometimes you send a SYN to one host and you get the SYN/ACK back from a different host (asymmetric NAT). There are entire class A networks with no hosts in them at all (The Black Holes of the Internet). Never scan sequential. If a remote class B or class C is hit with 50k SYNCs per second the serving router of the target network will start sending out ARP requests to resolve the MAC of all these hosts. ARP requests are broadcast messages. This will overload some hosts on the target 'local' network which will crash or not respond for several seconds while processing the ARP requests. You will miss those hosts. Scan 'spread spectrum' and increment the IP by 256 or a similar value.
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Teso we did not like script kiddies and we abhorred those doing DDoS. A small group of Teso and some friends reverse engineered the backdoors and started scanning for them. Our objective was to discourage script kiddies and stop DDoS attacks (by removing the DDoS agents).
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Holy shit.. I seriously miss the days when i was 16 and with my friends read and translate bugtraq mails and trying to compile/use teso exploits...As you can see, the script kiddies still here and without logic use exploit writed by someone and the 90% didnt try to understand what was the flaw...sigh, this world, stink. Not a long time ago, someone ask me: "What is Amap?" and I say, RTFM. I'm ask to myself why peoples does not reads manuals. Thanks someone.
Manuals were poorly written in technicalese in the past. Now they are even worse ... still written in technicalese, but by people who don't speak English as a first or even second language.
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I was just thinking about Port Scanning the Internet and you've really helped out. Thanks!
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The main features of bscan were: Raw SYN scanner. Full TCP/IP stack in userland. Using ghost IP and ghost MAC (untraceable)
Modular. We developed loadable modules for telnet handshake, bind, http (HEAD / HTTP/1.0), ... Sending out 50.000 or more syn packets per second. Running on linux, sunos/solaris and bsd. Sounds very good
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UDP scan is activated with the -sU option. It can be combined with a TCP scan type such as SYN scan (-sS) to check both protocols during the same run.
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When scanning systems compliant with this RFC text, any packet not containing SYN, RST, or ACK bits will result in a returned RST if the port is closed and no response at all if the port is open. As long as none of those three bits are included, any combination of the other three (FIN, PSH, and URG) are OK.
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One day one of the German hackers who helped Teso came home drunk and decided to start another scan for a script kiddie
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not like script kiddies and we abhorred those doing DDoS. A small group of Teso and some friends reverse engineered the backdoors and started scanning for them.
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Is the source of bscan available for research reasons, today?
Holy shit.. I seriously miss the days when i was 16 and with my friends read and translate bugtraq mails and trying to compile/use teso exploits...As you can see, the script kiddies still here and without logic use exploit writed by someone and the 90% didnt try to understand what was the flaw...sigh, this world, stink. Not a long time ago, someone ask me: "What is Amap?" and I say, RTFM. I'm ask to myself why peoples does not reads manuals. Thanks someone.
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Nice of you to share seven years of your research and that internet scanning revealed a lot of hidden information. Too bad so few people have access to it.
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To be honest most of this went over my head so I guess I am not very smart when it comes to internet scanning, hacking, and all that. But the post did open my eyes and get me thinking. Guess I have some stuff to learn!
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One day one of the German hackers who helped Teso came home drunk and decided to start another scan for a script kiddie
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Thanks for the Port working over the internet. Well I read new scanner here, Bscanner, I think its your own scanner. Well nicely written post.
I usually face the problem of ICMP messages but now it has been solved by your article. Thanks
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An interesting story from 2000. I think some of the concepts still work.
Port scanning was not so easy before but I think Web 2.0 has changed the scenario. Thanks for sharing.
That is a very impressive topic, and the information given in this article is very rare. Thank you so much for sharing that with us.
I think a distributed port scanner that divides up the task among all would be really cool. Not just for a single port, but for every port on every ip address. Also if it's a purely distributed tool as far as scanning but also distribution of scanning results, this opens up the problem of garbage data sent by idiots trying to ruin it.
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I think that,if a remote class B or class C is hit with 50k SYNCs per second the serving router of the target network will start sending out ARP requests to resolve the MAC of all these hosts. ARP requests are broadcast messages. This will overload some hosts on the target 'local' network which will crash or not respond for several seconds while processing the ARP requests. You will miss those hosts. Scan 'spread spectrum' and increment the IP by 256 or a similar value. I hope this will be useful to you. Anyways nice discussion.
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Port scanning has its own importance when we are talking about transferring the data over networks. Thanks for sharing the importance of port scanning.
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Port Scanning is very important when we are dealing with huge collection of data, it eliminate chances of errors. Thanks
A small group of Teso and some friends reverse engineered the backdoors and started scanning for them
very good article and comment.
"Thousand ghost ips" ,those could still be used if people are into link building .But i also agree to the latter where it says make sure everything that is done is legal an does not cause any harm to anyone .Thank you for the post .
If its all with in the legal boundaries then it's not bad.
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Nmap can now be used to scan the entire Internet. That's incredible!
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At Teso we did not like script kiddies and we abhorred those doing DDoS. A small group of Teso and some friends reverse engineered the backdoors and started scanning for them. Our objective was to discourage script kiddies and stop DDoS attacks (by removing the DDoS agents).
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Thank you for the informative post.. but as far as I know i think port scanning can be discouraged by using a decent firewall... or am i wrong?
I think point 9, "be kind to other administrators" should be bolded and underlined, cause some people just dont have manners :/
Very informative and well written article, with some great techniques. Keep up the great work friend.
I know in 2000 one of our problems at Teso was that many script kiddies entered the arena
and started setting up DDoS hosts and owning like mad. Hacking became mainstream.
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What is the reason behind port scanning the internet? Is it to avoid or block malicious content?
Is the bscan available now for download? I really need to scan the internet ports. Thanks.
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I thought Bscan does not support on linux. Now I know it does. Where can I download bscan from? Thanks.
If a remote class B or class C is hit with 50k SYNCs per second the serving router of the target network will start sending out ARP requests to resolve the MAC of all these hosts. ARP requests are broadcast messages. This will overload some hosts on the target 'local' network which will crash or not respond for several seconds while processing the ARP requests.
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So what's the point of port scanning the internet? What was the idea behind it?
Who did it benefit?
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Good news: Nmap can now be used to scan the entire Internet.
Interesting reading, will bookmark for later ,Thank you for the enlighten
Be kind to other administrators. We set up a charity ("The Institute for Internet Statistics") to have a reasonable explanation for any IT administrator who complained about our scanning activities.
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I am glad you'll created an internet scanner. This will help reduce the hackers all around. I am surprised how bscan scans the entire internet within few hours, This must be one good software.
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Port scanning the internet is very vital for the concerned systems as it protects the system from many unwanted elements.
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This will to some extent help curb hacking process happening all over the world. Thanks for sharing all the details!
It is highly recommended to have regular anti-virus scan for your system. It keeps your computer secure!
These days, many harmful malware are on hyper active stage to attack any vulnerable system so it is always better to have it scanned regularly.
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The design and operation of the Internet is based on the Internet Protocol Suite, commonly also called TCP/IP. In this system, hosts and host services are referenced using two components: an address and a port number. There are 65536 distinct and usable port numbers. Most services use a limited range of numbers.
Some port scanners scan only the most common port numbers, or ports most commonly associated with vulnerable services, on a given host. See: List of TCP and UDP port numbers.
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We developed a new scanner (called 'bscan', not published but a handful of people had it) that was capable of scanning the internet.
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we abhorred those doing DDoS. A small group of Teso and some friends reverse engineered the backdoors and started scanning for them.
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