Ssh brute force sald?r?lar?
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Ssh Brute Force Attacks - Documentation
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![Zay?f ?ifrelere sahip oldu?unuzda rastgele ?ifreler denenerek brute force sald?r?lar?
ger?ekle?tirilebilmektedir. ?nternette wordlist diye adland?r?lan kelime listeleri ile otomatize
ara?lar ile brute force sald?r?lar? denenebilmektedir.
Genel olarak brute force sald?r?lar? olsun, ya da ssh brute force sald?r?lar? olsun bu saldr? tipleri
ile ilgili bir ?ok ara? bulunmaktad?r.
Hydra, Medusa, Ncrack, Metasploit, HttpBrute gibi daha bir ?ok farkl? sald?r? yapmam?za imkan
tan?yan ara? bulunmaktad?r.
?imdi ?rnek bir senaryo ile ssh brute force sald?r?s?n? ger?ekle?tirelim ve bunu tespit edelim.
Lab ortam? i?in ¨¹? farkl? da??t?m gerekmektedir.
** Ubuntu Desktop(Sald?r? yap?lacak s¨¹r¨¹m ?nemli de?il)
** Kali linux Atak ama?l? kullan?lacak
**Seurity onion sald?r? tespit ama?l?
Sald?r? i?leyi? bi?imine gelicek olursak;
?ncelikle vmware sanal makinalarda bulunan da??t?mlar?m?z aktif edilir. Daha sonra ubuntu
desktop makinam?z?n ifconfig komutu ile ip adresini ??reniriz. [ 192.168.221.133 ip adresimiz ]](https://image.slidesharecdn.com/sshbruteforcesaldrlar-141117105015-conversion-gate02/85/Ssh-brute-force-saldirilari-4-320.jpg)
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Ssh brute force sald?r?lar?
- 1. SSH Brute Force Sald?r?lar? Ssh iki cihaz aras?nda g¨¹venlik kanal?yla veri de?i?imine imkan sa?layan, izin veren bir network protokol¨¹d¨¹r. Birincil olarak linux ve unix gibi protokollerin kabuk hesaplar?na ula?abilmek i?in kullan?lm??t?r. Telnet gibi g¨¹vensiz protokollerin yerini almak amac?yla dizayn edilmi?tir. Telnet protokol¨¹ ?ifresiz bir bi?imde veri al??verisinde paralolar?n?z g?r¨¹lebilecek ?ekilde tasarlanm??t?r. Ssh protokol¨¹ ile veriler ?ifrelenerek g?nderildi?i i?in daha g¨¹venli veri aktar?m?na olanak tan?maktad?r. Ssh sunucusu default olarak tcp port 22 ¨¹zeriden haberle?me sa?lamkatad?r. Ssh client - ssh server aras?nda ger?ekle?en haberle?me sonucu ba?lant? kurulmaktad?r. Bir ?ok i?letim sistemi taraf?ndan desteklenmektedir. ssh bir ?ok uygulama ile beraber kullan?lan bir protokold¨¹r. Baz? uygulamalar sadece ssh serer ve ssh client programlar?na ihtiya? duyarak ?al???rlar. Bu noktada sssh ba?lant?lar?n?n ?nemi b¨¹y¨¹kt¨¹r.
- 2. ** Port y?nlendirme i?in kullan?labilir. ** Uzak kullan?c? ile kabu?a ba?lan?labilmektedir. ** Lokal bilgisayardan uzak bilgisayara dosya g?nderilebilmektedir. ** Ftp ile dosya g?nderimine alternatif bir g¨¹venlik ?nlemi sa?lanm?? olur. ** Openssh ile ?ifrelenmi? vpn ba?lant?lar?n?n olu?mas?na imkan tan?r. ** Uzaktan sunucu kontrol¨¹n¨¹n sa?lanmas?na imkan tan?maktad?r.
- 3. ssh protokol¨¹n¨¹ linux sunucular?n y?netimide kulland???m?z? daha ?nce belirtmi?tik. Hackerlar yada s?zma testi uzmanlar? hedef sisteme eri?im sa?lad?klar?nda root kullan?c? bile olabilirler. E?er gerekli ?nlemler al?nmam??sa. Hedef sistem ke?if ?al??malar?nda ya da bilgi toplam a?amas?nda ssh prtokol¨¹n¨¹n sistemede ke?fedildi?i s?rada bu protokole y?nelik ssh brute force (kaba kuvvet) sald?r?lar? deneyebilir. Deneme yan?lma sald?r?lar? olarakta adland?r?lmaktad?rlar. Temel olarak sald?r? i?leyi? modeli a?a??daki ?ekildeki gibidir.
- 4. Zay?f ?ifrelere sahip oldu?unuzda rastgele ?ifreler denenerek brute force sald?r?lar? ger?ekle?tirilebilmektedir. ?nternette wordlist diye adland?r?lan kelime listeleri ile otomatize ara?lar ile brute force sald?r?lar? denenebilmektedir. Genel olarak brute force sald?r?lar? olsun, ya da ssh brute force sald?r?lar? olsun bu saldr? tipleri ile ilgili bir ?ok ara? bulunmaktad?r. Hydra, Medusa, Ncrack, Metasploit, HttpBrute gibi daha bir ?ok farkl? sald?r? yapmam?za imkan tan?yan ara? bulunmaktad?r. ?imdi ?rnek bir senaryo ile ssh brute force sald?r?s?n? ger?ekle?tirelim ve bunu tespit edelim. Lab ortam? i?in ¨¹? farkl? da??t?m gerekmektedir. ** Ubuntu Desktop(Sald?r? yap?lacak s¨¹r¨¹m ?nemli de?il) ** Kali linux Atak ama?l? kullan?lacak **Seurity onion sald?r? tespit ama?l? Sald?r? i?leyi? bi?imine gelicek olursak; ?ncelikle vmware sanal makinalarda bulunan da??t?mlar?m?z aktif edilir. Daha sonra ubuntu desktop makinam?z?n ifconfig komutu ile ip adresini ??reniriz. [ 192.168.221.133 ip adresimiz ]
- 5. Daha sonra kali linux ¨¹zerinde bulunan hydra arac? ¨¹zerinden ?ekildeki komut ?al??t?r?lacak ?ekilde verilir. Art?k kelime listesinde bulunan ?ifreler denenmektedir.
- 6. Bu komutal bulamad?. Fakat common.txt dosyas? diye bir wordlist olupturup i?ine yazd???m?z ?ifreler ile deniyoruz. En sonuna ise ger?ek ?ifremiz 1 de?erini yerle?tiriyoruz. Atak ger?ekle?tirme i?lemi ba?lad?. Biraz zaman al?cakt?r. Yazd???m?z kelime listesine g?re ama ?ekilden g?rebilirsiniz. ??lem ba?ar? ile tamamland?. ?ifrenin 1 oldu?unu ve tespit edildi?ini g?rd¨¹k. Security onionda aktif olarak ?al??an snort ise bu durumu tespit etmi?tir. snorby aray¨¹zdende yap?lan bu atakla ilgili d¨¹?en loglar? g?rmek m¨¹mk¨¹nd¨¹r. Sald?r?n?n yap?ld??? kaynak ve hedef ip adresi tespit edilmi?tir.
- 7. Referanslar: http://rimuhosting.com/knowledgebase/linux/misc/preventing-brute-force-ssh-attacks http://blog.sucuri.net/2013/07/ssh-brute-force-the-10-year-old-attack-that-still-persists.html http://www.rebex.net/sample/terminal-client-winform/default.aspx http://doctus.org/showthread.php?t=8880 http://en.wikipedia.org/wiki/Brute-force_attack http://www.syslogs.org/centos-uzerinde-fail2ban-ile-brute-force-onlemi/ http://people.clarkson.edu/~jmatthew/publications/leet08.pdf