{"id":294,"date":"2013-12-26T20:01:42","date_gmt":"2013-12-26T20:01:42","guid":{"rendered":"http:\/\/tomaskalabis.com\/wordpress\/?p=294"},"modified":"2016-03-09T08:55:14","modified_gmt":"2016-03-09T08:55:14","slug":"dos-syn-flood-ddos","status":"publish","type":"post","link":"https:\/\/tomaskalabis.com\/wordpress\/dos-syn-flood-ddos\/","title":{"rendered":"DoS, DDos &#038; SYN flood"},"content":{"rendered":"<p>Nen\u00ed tomu tak dlouho, kdy se v b\u0159eznu roku 2013 ocitly pod \u00fatokem \u010desk\u00e9 servery jak ji\u017e zpravodajsk\u00e9, mobiln\u00edch oper\u00e1tor\u016f \u010di ve\u0159ejn\u00e9 sf\u00e9ry. Tyto \u00fatoky byly vedeny pomoc\u00ed DDos \u00fatok\u016f co\u017e ve voln\u00e9m p\u0159ekladu znamen\u00e1 &#8222;Distribuovan\u00fd DoS \u00fatok&#8220;. \u00a0Ale nejprve je nutno porozum\u011bt samotn\u00e9mu DoS \u00fatoku.<\/p>\n<p>DoS &#8211; Denial of Service &#8211; odm\u00edtnut\u00ed slu\u017eby &#8211; spad\u00e1 mezi techniku \u00fatok\u016f na webov\u00e9 str\u00e1nky nebo internetov\u00e9 slu\u017eby, p\u0159i kter\u00fdch doch\u00e1z\u00ed k p\u0159ehlcen\u00ed serveru po\u017eadavky a n\u00e1sledn\u011b &#8211; p\u00e1du, omezen\u00ed, nedostupnosti \u010di nefunk\u010dnosti samotn\u00e9 slu\u017eby \u010di webu.<\/p>\n<p><a href=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/ddos-nuke.png\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-298 aligncenter\" src=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/ddos-nuke.png\" alt=\"ddos-nuke\" width=\"300\" height=\"300\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/ddos-nuke.png 300w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/ddos-nuke-188x188.png 188w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/ddos-nuke-288x288.png 288w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>DoS \u00fatoky maj\u00ed tyto spole\u010dn\u00e9 charakteristiky:<\/p>\n<ul>\n<li>P\u0159ehlcen\u00ed provozu na s\u00edti n\u00e1hodn\u00fdmi daty, kter\u00e9 zabra\u0148uj\u00ed prot\u00e9k\u00e1n\u00ed skute\u010dn\u00fdch dat.<\/li>\n<li>Komunikace u\u017eivatele se \u00a0serverem je bu\u010f nemo\u017en\u00e1 nebo velice omezen\u00e1 &#8211; pomal\u00e1 &#8211; zpomalen\u00ed slu\u017eby, n\u00edzk\u00e1 nebo \u017e\u00e1dn\u00e1 dostupnost webov\u00fdch str\u00e1nek.<\/li>\n<li>V n\u011bkter\u00fdch p\u0159\u00edpadech naru\u0161en\u00ed konfigura\u010dn\u00edho nastaven\u00ed serveru v extr\u00e9mn\u00edch p\u0159\u00edpadech extr\u00e9mn\u00ed zat\u00ed\u017een\u00ed CPU c\u00edlov\u00e9ho serveru, v tomto p\u0159\u00edpad\u011b m\u016f\u017ee doj\u00edt k restartu serveru, jeliko\u017e m\u016f\u017ee b\u00fdt nastaveno pravidlo (kdy\u017e je CPU vyt\u00ed\u017eeno na 100% d\u00e9le ne\u017e 15 min tak se server restartuje).<\/li>\n<li>Vsunut\u00edm chybov\u00fdch hl\u00e1\u0161en\u00ed do sekvence instrukc\u00ed, kter\u00e9 m\u016f\u017eou v\u00e9st k p\u00e1du syst\u00e9mu \u010di samotn\u00e9mu p\u00e1du opera\u010dn\u00edho syst\u00e9mu.<\/li>\n<\/ul>\n<p><strong>\u00a0DDoS<\/strong><\/p>\n<p>Distribuovan\u00fd DoS \u00fatok (DDoS,\u00a0<i>Distributed Denial of Service attack<\/i>) &#8211; hlavn\u00edm znakem je v\u011bt\u0161\u00ed po\u010det po\u010d\u00edta\u010d\u016f, kte\u0159\u00ed se sna\u017e\u00ed sou\u010dasn\u011b zahltit dan\u00fd c\u00edl. V 90% t\u011bchto \u00fatok\u016f se jedn\u00e1 o \u00fatok o kter\u00e9m majitel po\u010d\u00edta\u010de \u010di ntb ani nem\u00e1 pon\u011bt\u00ed, jeliko\u017e se jedn\u00e1 o d\u016fsledek napaden\u00ed a \u00fasp\u011b\u0161n\u00e9ho infikov\u00e1n\u00ed t\u011bchto syst\u00e9m\u016f. Mezi jeden zp\u016fsob \u00fatoku pat\u0159\u00ed malware, kter\u00fd v sob\u011b m\u00e1 informace o \u010dase a datu kdy \u00fato\u010dit a pak tak\u00e9 IP adresu na kterou bude proveden \u00fatok. Druh\u00fd zp\u016fsob je kdy je syst\u00e9m napaden programem kter\u00fd se jmenuje bot, kter\u00fd pot\u00e9 b\u011b\u017e\u00ed jako proces a vy\u010dk\u00e1v\u00e1 na informace od tv\u016frce bota &#8211; \u00fato\u010dn\u00edka, tento syst\u00e9m se pak naz\u00fdv\u00e1 jako zoobie a spole\u010dn\u011b s dal\u0161\u00edmi naka\u017een\u00fdmi PC, NTB dokonce i servery pak tvo\u0159\u00ed s\u00ed\u0165, kter\u00fd se naz\u00fdv\u00e1 botnet.<\/p>\n<p><a href=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/2005-dos1.gif\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-310 aligncenter\" src=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/2005-dos1.gif\" alt=\"2005-dos1\" width=\"400\" height=\"360\" \/><\/a><\/p>\n<p><strong>ICMP Floods &#8211; SYN Flood<\/strong><\/p>\n<p><a href=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN11.png\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-301 aligncenter\" src=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN11.png\" alt=\"SYN11\" width=\"471\" height=\"272\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN11.png 471w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN11-288x166.png 288w\" sizes=\"(max-width: 471px) 100vw, 471px\" \/><\/a><\/p>\n<p>SYN Flood je u\u010debnicov\u00e1 uk\u00e1zka DoS \u00fatoku, kdy\u017e chce u\u017eivatel nav\u0161t\u00edvit webov\u00e9 str\u00e1nky prvn\u00edm krokem je, aby si prohl\u00ed\u017ee\u010d a server podali ruce, tak\u017ee po zad\u00e1n\u00ed tomaskalabis.com do prohl\u00ed\u017ee\u010de odch\u00e1z\u00ed prvn\u00ed paket, kter\u00fd se jmenuje SYN (synchronizace), kter\u00fd d\u00e1v\u00e1 serveru najevo, \u017ee prohl\u00ed\u017ee\u010d se s n\u00edm chce spojit, te\u010f nast\u00e1v\u00e1 \u010das na odpov\u011b\u010f serveru, kter\u00fd prohl\u00ed\u017ee\u010di za\u0161le paket SYN-ACK (acknowledge) co\u017e znamen\u00e1 souhlas se synchronizac\u00ed a n\u00e1sledn\u011b server \u010dek\u00e1 na potvrzen\u00ed od prohl\u00ed\u017ee\u010de kter\u00fd po\u0161le paket ACK&#8230; Tohle je b\u011b\u017en\u00e1 situace inicializace TCP spojen\u00ed klienta a serveru.<\/p>\n<p><a href=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN2.png\"><img decoding=\"async\" loading=\"lazy\" class=\"size-large wp-image-300 aligncenter\" src=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN2-494x168.png\" alt=\"SYN2\" width=\"494\" height=\"168\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN2-494x168.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN2-288x98.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN2-500x170.png 500w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2013\/12\/SYN2.png 931w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><\/p>\n<p>Spojen\u00ed klienta se serverem v DDos SYN flood vypad\u00e1 v prvn\u00edm kroku naprosto toto\u017en\u011b, klienti v botnetu dostanou p\u0159\u00edkaz aby si podali ruku se serverem tomaskalabis.com a po\u0161lou mu ruku v podob\u011b SYN paketu, server tyto po\u017eadavky vlo\u017e\u00ed do fronty a postupn\u011b za\u010dne rozes\u00edlat SYN-ACK a \u010dek\u00e1 na kone\u010dn\u00e9 potvrzen\u00ed ACK a v tomhle je pr\u00e1v\u011b podstata SYN potopy &#8211; nam\u00edsto aby klient odeslal potvrzen\u00ed ACK po\u0161le nov\u00fd SYN paket tak server za\u010dne \u010dekat, buffer se postupn\u011b napl\u0148uje a\u017e doch\u00e1z\u00ed k p\u0159\u00edjmu ostatn\u00edch klient\u016f. U\u017eivatel Franta u jin\u00e9ho PC se chce spojit s dan\u00fdm serverem po\u0159\u00e1d ma\u010dk\u00e1 F5 t\u00edm situaci je\u0161t\u011b zhor\u0161uje, proto\u017ee vytv\u00e1\u0159\u00ed dal\u0161\u00ed po\u017eadavky na spojen\u00ed.\u00a0Dal\u0161\u00ed varianta SYN floodu zase pou\u017e\u00edv\u00e1 podvr\u017een\u00e9 IP adresy. Paket s \u00favodn\u00ed zpr\u00e1vou SYN je tedy podepsan\u00fd fale\u0161n\u00fdm odes\u00edlatelem a server pak po\u0161le SYN-ACK paket n\u011bkam \u00fapln\u011b jinam, odkud tak\u00e9 nikdy nedostane z\u00e1v\u011bre\u010dnou odpov\u011b\u010f ACK.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nen\u00ed tomu tak dlouho, kdy se v b\u0159eznu roku 2013 ocitly pod \u00fatokem \u010desk\u00e9 servery jak ji\u017e zpravodajsk\u00e9, mobiln\u00edch oper\u00e1tor\u016f \u010di ve\u0159ejn\u00e9 sf\u00e9ry. Tyto \u00fatoky byly vedeny pomoc\u00ed DDos \u00fatok\u016f &#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[14],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DoS, DDos &amp; SYN flood - tomaskalabis.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tomaskalabis.com\/wordpress\/dos-syn-flood-ddos\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DoS, DDos &amp; SYN flood - tomaskalabis.com\" \/>\n<meta property=\"og:description\" content=\"Nen\u00ed tomu tak dlouho, kdy se v b\u0159eznu roku 2013 ocitly pod \u00fatokem \u010desk\u00e9 servery jak ji\u017e zpravodajsk\u00e9, mobiln\u00edch oper\u00e1tor\u016f \u010di ve\u0159ejn\u00e9 sf\u00e9ry. 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