Is the Scanning of Computer Networks Dangerous?
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1 Baltic DB & IS 2008 Tallinn University of Technology Is the Scanning of Computer Networks Dangerous?
2 The talk is about... The need of network scanning, its main principles and related problems A freely available network scanning tool, which can be used in practice, and its design Angry IP Scanner 2
3 Scanning of computer networks Examining a single network address Searching for addresses with specific properties IP Scanning involves Pinging Port scanning Gathering of other information 3
4 Typical gathered information Alive/dead status Average packet roundtrip time TTL distance (in number of routers) Host and domain names Open and filtered TCP and UDP ports Running services and their versions OS type and version Much more info can be obtained indirectly 4
5 Scanning purposes Offensive (Attacks) Defensive (Preventive defense) Maintenance (Monitoring and inventory) 5
6 Legal issues Most countries' laws forbid getting illegal access to data, destroying, spoiling, modifying it, or reducing its usefulness or value in any other way Scanning results provide mostly publicly available and freely available information therefore it is legal with the probable exception of some 'more advanced' scanning techniques 6
7 Safety How safe is it to perform scanning nowadays? legal, but may cause problems Are such tools dangerous for the humanity? best tools for maintaining security are the same ones that can be used in preparation for attacks 7
8 State of Internet security Foundation protocols are old there have been more trust before Present-day Internet is insecure too much anonymity weak authentication (passwords) vulnerable routing and DNS low-quality software human factor (social engineering, mistakes, lack of knowledge and skills) 8
9 Angry IP Scanner Open source GPL Cross-platform User-friendly Extensible (Nice name) 9
10 Technological choices Java modern and popular, now open-source productive portable, cross-platform JNI (Java Native Interface) SWT open source good performance native look and feel on all platforms 10
11 Modularity and Extensibility Modular design Possibility of plugins Feeders generate addresses for scanning Pingers check the alive status Fetchers retrieve info about each address Exporters store the scanning results Openers open addresses in other software User selects feeder and inputs parameters User selects fetchers used for the scan User choses to export the results Fetchers Exporters Disk or other storage Fetchers Fetchers Fetchers Feeders Scanner sequentially passes control to Fetchers and Pingers Scanning results Fetchers Fetchers Pingers User choses to do something with a single result Fetchers Openers External software processes the result 11
12 Increasing performance Parallelizing Adapted timeouts Thread pooling Speed-accuracy compromise SYN-ACK-RST scanning 12
13 Simplified state diagram 13
14 Platform support Linux primary development platform best choice for scanning Mac OS X based on FreeBSD kernel lots of conceptual differences Windows support due to popularity inferior to anything else out there 14
15 Deployment One-file executable (jar) Separate for each platform Linux: rpm & deb Mac: application bundle Windows: exe Automatically extracts native libraries (.dll and.so) Size < 1 Mb 15
16 Comparison with other tools Nmap Probably the most popular scanner Has some 'more advanced' tricks Windows support is fairly new Harder to use Requires proper installation Angry IP Scanner No installation necessary Runnable from USB drives GUI by design ease of use Superior extensibility via plugins No other comparable general-purpose, opensource and cross-platform scanners 16
17 Problems (1) Many low-quality clones Angry IP Scanner was the first general-purpose GUI scanner Anti-virus software nowadays AV vendors tend to enlarge their databases at any price they take users' freedom away (even more than Microsoft does) 17
18 Problems (2) Windows >= XP SP2 Used by ~70% of users (unfortunately) Removed raw socket support hard to do more exotic things TCP connection rate limiting max 10 simultaneous connection attempts (max 2 in some Vista editions) very slow scanning performance 18
19 Results (1) Working software (primary measure of success) 19
20 Results (2) Official homepage: page views /day 3000 downloads /day The first ip scanner in Google! Project homepage: Subversion: version control Bug and feature tracking Forums 20
21 Results (3) Download history of Angry IP Scanner * Last 12 months Last 2 months Increasing trend Less downloads during weekends - (June stats are incomplete) people use it at work * These stats reflect only downloads from sourceforge servers, but the application is widely mirrored on many 3rd-party software download sites 21
22 Now & Future Continue the development more functionality (OS fingerprinting, version detection, stealth scanning, etc) bugfixing Involve more people better documentation wiki-based homepage more example plugins 22
23 Scanning of computer networks Live demo & Questions! 23
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