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Layer 7 denial of services attack mitigation
This document discusses layer 7 denial of service attacks and mitigation techniques. It describes how layer 7 attacks target application layer protocols like HTTP and FTP to overwhelm servers. The document then provides an example of an HTTP flood attack against a website and the steps taken to analyze logs and implement mitigation like rate limiting, timeouts, and firewall rules. Effective mitigation requires identifying attacks, hardening servers, and contacting authorities.
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Layer 7 denial of services attack mitigation
- 1. Layer7 Denial OfSevice Attack Mitigation IT LESEHAN - y3dips Saturday, November 12, 11
- 2. Agenda • Introduction • Denial Of Service • Layer 7 Denial Of Service • Case Stories • Demo • Discussion Saturday, November 12, 11
- 3. Introduction • Freelance IT Security Consultant • More than 9 years in IT Security • Founder of “ECHO” one of Indonesian Hacker Community, established 2003 • Founder of IDSECCONF - Indonesia Security Conference in Cooperation with DEPKOMINFO • More Info: • me@ammar.web.id • @y3dips Saturday, November 12, 11
- 4. Denial of Service Suatu jenis kegiatan yang bertujuan untuk menggagalkan kerja suatu sistem secara maksimal baik sebagian atau seluruhnya. Saturday, November 12, 11
- 5. DOS • Stupid Act • Exhausted also yours • Old story, • moby write ddos in 2003 * • I write apache dos in 2003** • Well handle by now *http://ezine.echo.or.id/ezine2/ddos%7EMoby.txt **http://ezine.echo.or.id/ezine2/dos_buat_apache%7Ey3dips.txt Saturday, November 12, 11
- 6. Type of NetworkDOS • Layer 4 • Attack layer 4 protocol • TCP • SYN, FIN, ACK • smurf, TRINOO, stacheldart, teardrop Saturday, November 12, 11
- 7. Type of NetworkDOS • Layer 7 • Attack Layer 7 Protocol • HTTP, FTP, DNS • HTTP-slow post, HTTP-GET Saturday, November 12, 11
- 8. Real Life Stories When this all begin Saturday, November 12, 11
- 9. DOS Terhadap ECHO • 7 - 8 November 2011 • Unknown Motives • Echo Web Access Down Saturday, November 12, 11
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- 11. See TKP :) Saturday,November 12, 11
- 12. Check Validitas DOS • Only you? • Or for everyone :D • http://downforeveryoneorjustme.com/ Saturday, November 12, 11
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- 14. Analyze • The Server Down? • Or onlye specific service Down Saturday, November 12, 11
- 15. In this Case80 down Saturday, November 12, 11
- 16. Layer 7 DOS Lets Dig arround on 80! Saturday, November 12, 11
- 17. See Stats :) Saturday,November 12, 11
- 18. Ganti Periode Laporan: 201111 - Bulan Nov 2011 Go Statistik untuk: echo.or.id Terakhir diupdate: 08 Nov 2011 - 14:20 Periode Laporan: Bulan Nov 2011 Kapan: Monthly history Days of month Hari Jam (Waktu Server) Siapa: Countries Daftar Lengkap Host Daftar Lengkap Kunjungan Terakhir Alamat IP yang tidak teresolve Robot/Spider Daftar Lengkap Kunjungan Terakhir Navigasi: Lama kunjungan Jenis File Halaman yang Dilihat Daftar Lengkap Halaman masuk (entry page) Halaman keluar (exit page) Sistem Operasi Versi Tidak Diketahui Browser Versi Tidak Diketahui Referer: Asal Search engine referer Situs referer Pencarian Frase Pencarian Kata Kunci Pencarian Lainnya: Miscellaneous Kode error HTTP Halaman tidak ditemukan (not found) Ringkasan Periode Laporan Bulan Nov 2011 Kunjungan Pertama 01 Nov 2011 - 00:00 Kunjungan Terakhir 08 Nov 2011 - 11:35 Pengunjung Unik Jumlah Kunjungan Halaman Hit Bandwidth 10021 14357 102822 417078 1.45 GB Traffic viewed * (1.43 kunjungan/pengunjung) (7.16 Halaman/Kunjungan) (29.05 Hit/Kunjungan) (105.69 KB/Kunjungan) Traffic not viewed * 88111 145915 395.12 MB * Not viewed traffic includes traffic generated by robots, worms, or replies with special HTTP status codes. Monthly history Jan Feb Mar Apr Mei Jun Jul Agu Sep Okt Nov Des 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 Bulan Pengunjung Jumlah Halaman Hit Bandwidth Seems all Legit 11/9/11 Saturday, November 12, 11
- 19. 7, 8 November? Saturday,November 12, 11
- 20. 7, 8 November? Saturday,November 12, 11
- 21. Ask the Logs:) Saturday, November 12, 11
- 22. Logs • HTTP/S logs • http-access • http-error Saturday, November 12, 11
- 23. A Valid One Saturday,November 12, 11
- 24. A Valid Onebut also http-flood GET Saturday, November 12, 11
- 25. Conclusion • Its an HTTP-flood GET • Connection need to be Established • IP need to be valid? Saturday, November 12, 11
- 26. Learn from Code:) Saturday, November 12, 11
- 27. *Credit to Googlefor the code, just dig and found Saturday, November 12, 11
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- 29. Mitigation • Always Have your backup • No privil8 access to server; LAPORKAN Saturday, November 12, 11
- 30. Mitigation • Had The Privileged • check netstat -n | grep 80 | wc -l • block : • iptables -A INPUT -s x. x. x. x -p tcp - j TARPIT • iptables -A INPUT -s x. x. x. x -p tcp - j DROP Saturday, November 12, 11
- 31. TARPITING Care to Send and double the packet :) ? http://www.secureworks.com/research/threats/ddos/ Saturday, November 12, 11
- 32. Hardening Apache • TimeOut=Default 300 detik atau 5 Menit, disarankan 10 detik • TimeOut akan melindungi server dari rikues dalam jumlah besar, dan tidak pernah di putus oleh Attacker, dengan adanya TimeOut, apabila tidak terjadi transaksi dalam waktu tersebut (10 detik), maka Apache akan memutus koneksi Saturday, November 12, 11
- 33. Hardening Apache • KeepAlive = On • KeepAlive akan mengijinkan Berbagai jenis HTTP rikues dilakukan dalam satu koneksi. • KeepAlive = 15 detik • Setting ini akan melindungi Server dari Rikues Keepalive tanpa transaksi Saturday, November 12, 11
- 34. Hardening Apache • AcceptFilter = http/https data • Melindungi dari jenis serangan, dimana attacker membuka koneksi via socket dan membiarkannya tanpa terjadinya transaksi data. Dengan mendefinisikan data pada http dan https akan meminimalisir jenis serangan ini. Saturday, November 12, 11
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- 37. Layer7 Denial OfSevice Attack Mitigation IT LESEHAN - y3dips Saturday, November 12, 11