{"id":18533,"date":"2021-01-23T22:11:29","date_gmt":"2021-01-23T15:11:29","guid":{"rendered":"https:\/\/speed.family\/?p=18533"},"modified":"2021-01-23T22:11:29","modified_gmt":"2021-01-23T15:11:29","slug":"kieu-tan-cong-ddos","status":"publish","type":"post","link":"https:\/\/kiencang.net\/kieu-tan-cong-ddos\/","title":{"rendered":"C\u00e1c ki\u1ec3u t\u1ea5n c\u00f4ng DDoS kh\u00e1c nhau"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u1edbp \u1ee9ng d\u1ee5ng<\/h2>\n\n\n<h4 class=\"wp-block-heading\"><strong>M\u1ee5c ti\u00eau c\u1ee7a cu\u1ed9c t\u1ea5n c\u00f4ng<\/strong>:<\/h4>\n\n\n<p>\u0110\u00f4i khi \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0&nbsp;<a href=\"https:\/\/kiencang.net\/ddos-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u1ea5n c\u00f4ng DDoS<\/a>&nbsp;l\u1edbp 7&nbsp;(tham chi\u1ebfu \u0111\u1ebfn l\u1edbp 7 c\u1ee7a m\u00f4 h\u00ecnh OSI), m\u1ee5c ti\u00eau c\u1ee7a c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y l\u00e0 l\u00e0m c\u1ea1n ki\u1ec7t t\u00e0i nguy\u00ean c\u1ee7a m\u1ee5c ti\u00eau \u0111\u1ec3 t\u1ea1o ra h\u1ec7 qu\u1ea3 l\u00e0 t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5 (dinial-of-service).<\/p>\n\n\n<p>C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng nh\u1eafm v\u00e0o l\u1edbp n\u01a1i c\u00e1c trang web \u0111\u01b0\u1ee3c t\u1ea1o tr\u00ean m\u00e1y ch\u1ee7 v\u00e0 \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i theo&nbsp;y\u00eau c\u1ea7u&nbsp;HTTP.&nbsp;M\u1ed9t y\u00eau c\u1ea7u HTTP \u0111\u01a1n l\u1ebb l\u00e0 r\u1ebb v\u1ec1 m\u1eb7t t\u00ednh to\u00e1n \u0111\u1ec3 th\u1ef1c thi \u1edf ph\u00eda m\u00e1y kh\u00e1ch (client side), nh\u01b0ng n\u00f3 c\u00f3 th\u1ec3 \u0111\u1eaft \u0111\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 \u0111\u00edch \u0111\u1ec3 ph\u1ea3n h\u1ed3i cho m\u00e1y kh\u00e1ch. V\u00ec m\u00e1y ch\u1ee7 th\u01b0\u1eddng ph\u1ea3i t\u1ea3i nhi\u1ec1u t\u1ec7p v\u00e0 ch\u1ea1y c\u00e1c truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 t\u1ea1o th\u00e0nh n\u1ed9i dung cho trang web.<\/p>\n\n\n<p>C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u1edbp 7 r\u1ea5t kh\u00f3 \u0111\u1ec3 ch\u1ed1ng l\u1ea1i, v\u00ec kh\u00f3 c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c l\u01b0u l\u01b0\u1ee3ng \u0111\u1ed9c h\u1ea1i v\u1edbi l\u01b0u l\u01b0\u1ee3ng h\u1ee3p ph\u00e1p.<\/p>\n\n\n<h4 class=\"wp-block-heading\"><strong>V\u00ed d\u1ee5 v\u1ec1 t\u1ea5n c\u00f4ng l\u1edbp \u1ee9ng d\u1ee5ng<\/strong>:<\/h4>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"664\" height=\"443\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-ung-dung.png\" alt=\"ki\u1ec3u t\u1ea5n c\u00f4ng DDoS v\u00e0o l\u1edbp \u1ee9ng d\u1ee5ng\" class=\"wp-image-18545\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-ung-dung.png 664w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-ung-dung-300x200.png 300w\" sizes=\"(max-width: 664px) 100vw, 664px\" \/><figcaption>K\u1ebb t\u1ea5n c\u00f4ng \u0111i\u1ec1u khi\u1ec3n c\u00e1c Bot truy c\u1eadp v\u00e0o trang PHP \u0111\u1ed9ng c\u1ee7a n\u1ea1n nh\u00e2n<\/figcaption><\/figure><\/div>\n\n\n<h4 class=\"wp-block-heading\"><strong>T\u1ed5ng t\u1ea5n c\u00f4ng HTTP <\/strong><\/h4>\n\n\n<p>Cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y t\u01b0\u01a1ng t\u1ef1 nh\u01b0 nh\u1ea5n refresh tr\u00ean tr\u00ecnh duy\u1ec7t web nhi\u1ec1u l\u1ea7n b\u1eb1ng nhi\u1ec1u m\u00e1y t\u00ednh kh\u00e1c nhau c\u00f9ng m\u1ed9t l\u00fac &#8211; s\u1ed1 l\u01b0\u1ee3ng l\u1edbn c\u00e1c y\u00eau c\u1ea7u HTTP tr\u00e0n ng\u1eadp m\u00e1y ch\u1ee7, d\u1eabn \u0111\u1ebfn vi\u1ec7c t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5.<\/p>\n\n\n<p>Ki\u1ec3u t\u1ea5n c\u00f4ng n\u00e0y c\u00f3 nhi\u1ec1u h\u00ecnh th\u00e1i t\u1eeb \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn ph\u1ee9c t\u1ea1p.<\/p>\n\n\n<p>Vi\u1ec7c tri\u1ec3n khai \u0111\u01a1n gi\u1ea3n h\u01a1n c\u00f3 th\u1ec3 l\u00e0 truy c\u1eadp m\u1ed9t URL c\u1ee5 th\u1ec3 c\u00f3 c\u00f9ng d\u1ea3i \u0111\u1ecba ch\u1ec9 IP t\u1ea5n c\u00f4ng, li\u00ean k\u1ebft gi\u1edbi thi\u1ec7u v\u00e0 t\u00e1c nh\u00e2n ng\u01b0\u1eddi d\u00f9ng (user agents).&nbsp;C\u00e1c phi\u00ean b\u1ea3n ph\u1ee9c t\u1ea1p h\u01a1n c\u00f3 th\u1ec3 bao g\u1ed3m s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn \u0111\u1ecba ch\u1ec9 IP t\u1ea5n c\u00f4ng v\u00e0 nh\u1eafm m\u1ee5c ti\u00eau c\u00e1c URL ng\u1eabu nhi\u00ean b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c li\u00ean k\u1ebft gi\u1edbi thi\u1ec7u v\u00e0 t\u00e1c nh\u00e2n ng\u01b0\u1eddi d\u00f9ng ng\u1eabu nhi\u00ean (v\u00e0 b\u1ea1n s\u1ebd kh\u00f3 ph\u00e1t hi\u1ec7n, x\u1eed l\u00fd h\u01a1n).<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng giao th\u1ee9c<\/h2>\n\n\n<h4 class=\"wp-block-heading\"><strong>M\u1ee5c ti\u00eau c\u1ee7a cu\u1ed9c t\u1ea5n c\u00f4ng<\/strong>:<\/h4>\n\n\n<p>T\u1ea5n c\u00f4ng giao th\u1ee9c, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u1ea5n c\u00f4ng c\u1ea1n ki\u1ec7t tr\u1ea1ng th\u00e1i, g\u00e2y ra gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5 do s\u1eed d\u1ee5ng qu\u00e1 nhi\u1ec1u t\u00e0i nguy\u00ean m\u00e1y ch\u1ee7 v\u00e0 \/ ho\u1eb7c t\u00e0i nguy\u00ean c\u1ee7a thi\u1ebft b\u1ecb m\u1ea1ng nh\u01b0\u00a0<a href=\"https:\/\/kiencang.net\/firewall-hay-tuong-lua\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u01b0\u1eddng l\u1eeda (firewalls)<\/a>\u00a0v\u00e0 b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i (load balancer).<\/p>\n\n\n<p>C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng giao th\u1ee9c s\u1eed d\u1ee5ng c\u00e1c \u0111i\u1ec3m y\u1ebfu trong l\u1edbp 3 v\u00e0 l\u1edbp 4 c\u1ee7a ng\u0103n x\u1ebfp giao th\u1ee9c \u0111\u1ec3 khi\u1ebfn m\u1ee5c ti\u00eau kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c.<\/p>\n\n\n<h4 class=\"wp-block-heading\"><strong>V\u00ed d\u1ee5 v\u1ec1 cu\u1ed9c t\u1ea5n c\u00f4ng giao th\u1ee9c<\/strong>:<\/h4>\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"663\" height=\"444\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-giao-thuc.png\" alt=\"ki\u1ec3u t\u1ea5n c\u00f4ng DDoS v\u00e0o giao th\u1ee9c\" class=\"wp-image-18546\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-giao-thuc.png 663w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-giao-thuc-300x201.png 300w\" sizes=\"(max-width: 663px) 100vw, 663px\" \/><\/figure>\n\n\n<h4 class=\"wp-block-heading\"><strong>T\u1ed5ng t\u1ea5n c\u00f4ng<\/strong> <strong>SYN<\/strong><\/h4>\n\n\n<p>SYN Flood&nbsp;t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed9t nh\u00e2n vi\u00ean nh\u00e0 kho nh\u1eadn y\u00eau c\u1ea7u khi \u0111\u1ee9ng tr\u01b0\u1edbc kho h\u00e0ng.<\/p>\n\n\n<p>Nh\u00e2n vi\u00ean nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t y\u00eau c\u1ea7u, \u0111i v\u00e0 nh\u1eadn g\u00f3i h\u00e0ng, v\u00e0 ch\u1edd x\u00e1c nh\u1eadn tr\u01b0\u1edbc khi mang g\u00f3i h\u00e0ng ra.&nbsp;Sau \u0111\u00f3, nh\u00e2n vi\u00ean nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u y\u00eau c\u1ea7u g\u00f3i h\u00e0ng kh\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n x\u00e1c nh\u1eadn cho \u0111\u1ebfn khi h\u1ecd kh\u00f4ng th\u1ec3 mang th\u00eam g\u00f3i h\u00e0ng n\u00e0o n\u1eefa, cu\u1ed1i c\u00f9ng tr\u1edf n\u00ean qu\u00e1 t\u1ea3i v\u00e0 c\u00e1c y\u00eau c\u1ea7u b\u1eaft \u0111\u1ea7u kh\u00f4ng \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi.<\/p>\n\n\n<p>Cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y khai th\u00e1c qu\u00e1 tr\u00ecnh&nbsp;b\u1eaft tay TCP (TCP handshake)&nbsp;&#8211; chu\u1ed7i giao ti\u1ebfp m\u00e0 hai m\u00e1y t\u00ednh b\u1eaft \u0111\u1ea7u k\u1ebft n\u1ed1i m\u1ea1ng &#8211; b\u1eb1ng c\u00e1ch g\u1eedi \u0111\u1ebfn m\u1ee5c ti\u00eau m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn c\u00e1c g\u00f3i SYN \u201cY\u00eau c\u1ea7u k\u1ebft n\u1ed1i ban \u0111\u1ea7u\u201d TCP c\u00f3&nbsp;\u0111\u1ecba ch\u1ec9 IP ngu\u1ed3n&nbsp;gi\u1ea3 m\u1ea1o&nbsp;(spoofed source IP addresses).<\/p>\n\n\n<p>M\u00e1y m\u1ee5c ti\u00eau ph\u1ea3n h\u1ed3i m\u1ed7i y\u00eau c\u1ea7u k\u1ebft n\u1ed1i v\u00e0 sau \u0111\u00f3 \u0111\u1ee3i b\u01b0\u1edbc cu\u1ed1i c\u00f9ng trong qu\u00e1 tr\u00ecnh b\u1eaft tay, \u0111i\u1ec1u n\u00e0y kh\u00f4ng bao gi\u1edd x\u1ea3y ra, l\u00e0m c\u1ea1n ki\u1ec7t t\u00e0i nguy\u00ean c\u1ee7a m\u00e1y m\u1ee5c ti\u00eau (m\u00e1y ch\u1ee7 web b\u1ecb DDoS) trong qu\u00e1 tr\u00ecnh n\u00e0y.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng Volumtric<\/h2>\n\n\n<h4 class=\"wp-block-heading\"><strong>M\u1ee5c ti\u00eau c\u1ee7a cu\u1ed9c t\u1ea5n c\u00f4ng<\/strong>:<\/h4>\n\n\n<p>Lo\u1ea1i t\u1ea5n c\u00f4ng n\u00e0y c\u1ed1 g\u1eafng t\u1ea1o ra t\u1eafc ngh\u1ebdn b\u1eb1ng c\u00e1ch ti\u00eau th\u1ee5 t\u1ea5t c\u1ea3 b\u0103ng th\u00f4ng c\u00f3 s\u1eb5n n\u1eb1m gi\u1eefa m\u1ee5c ti\u00eau v\u00e0 k\u1ebft n\u1ed1i Internet l\u1edbn h\u01a1n.&nbsp;M\u1ed9t l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u1ee5c ti\u00eau b\u1ecb t\u1ea5n c\u00f4ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t h\u00ecnh th\u1ee9c khu\u1ebfch \u0111\u1ea1i ho\u1eb7c m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n kh\u00e1c \u0111\u1ec3 t\u1ea1o ra l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp l\u1edbn, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c y\u00eau c\u1ea7u t\u1eeb m\u1ea1ng botnet.<\/p>\n\n\n<h4 class=\"wp-block-heading\"><strong>V\u00ed d\u1ee5 v\u1ec1 khu\u1ebfch \u0111\u1ea1i<\/strong>:<\/h4>\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"665\" height=\"321\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-khuyech-dai.png\" alt=\"t\u1ea5n c\u00f4ng DDoS ki\u1ec3u khu\u1ebfch \u0111\u1ea1i\" class=\"wp-image-18548\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-khuyech-dai.png 665w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/tan-cong-khuyech-dai-300x145.png 300w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/><\/figure>\n\n\n<h4 class=\"wp-block-heading\"><strong>Khu\u1ebfch \u0111\u1ea1i DNS<\/strong><\/h4>\n\n\n<p>Ki\u1ec3u t\u1ea5n c\u00f4ng&nbsp;khu\u1ebfch \u0111\u1ea1i DNS (DNS amplification)&nbsp;gi\u1ed1ng nh\u01b0 n\u1ebfu ai \u0111\u00f3 g\u1ecdi \u0111\u1ebfn m\u1ed9t nh\u00e0 h\u00e0ng v\u00e0 n\u00f3i \u201cT\u00f4i s\u1ebd \u0111\u1eb7t v\u00e0i th\u1ee9, vui l\u00f2ng g\u1ecdi l\u1ea1i cho t\u00f4i v\u00e0 l\u1eb7p l\u1ea1i to\u00e0n b\u1ed9 \u0111\u01a1n \u0111\u1eb7t h\u00e0ng c\u1ee7a t\u00f4i nh\u00e9\u201d, trong \u0111\u00f3 s\u1ed1 g\u1ecdi l\u1ea1i th\u1ef1c s\u1ef1 thu\u1ed9c v\u1ec1 n\u1ea1n nh\u00e2n.&nbsp;V\u1edbi r\u1ea5t \u00edt n\u1ed7 l\u1ef1c, m\u1ed9t ph\u1ea3n h\u1ed3i d\u00e0i \u0111\u01b0\u1ee3c t\u1ea1o ra v\u00e0 g\u1eedi \u0111\u1ebfn n\u1ea1n nh\u00e2n.<\/p>\n\n\n<p>B\u1eb1ng c\u00e1ch th\u1ef1c hi\u1ec7n m\u1ed9t y\u00eau c\u1ea7u t\u1edbi m\u1ed9t&nbsp;m\u00e1y ch\u1ee7&nbsp;DNS&nbsp;m\u1edf&nbsp;v\u1edbi \u0111\u1ecba ch\u1ec9 IP gi\u1ea3 m\u1ea1o (gi\u1ea3 \u0111\u1ecba ch\u1ec9 IP c\u1ee7a n\u1ea1n nh\u00e2n), \u0111\u1ecba ch\u1ec9 IP m\u1ee5c ti\u00eau sau \u0111\u00f3 s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i t\u1eeb m\u00e1y ch\u1ee7.<\/p>\n\n\n<p>Xem th\u00e2m: <a href=\"https:\/\/kiencang.net\/cach-giam-ddos\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gi\u00fap gi\u1ea3m thi\u1ec3u t\u1ea5n c\u00f4ng DDoS l\u00e0 g\u00ec?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u1edbp \u1ee9ng d\u1ee5ng M\u1ee5c ti\u00eau c\u1ee7a cu\u1ed9c t\u1ea5n c\u00f4ng: \u0110\u00f4i khi \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0&nbsp;t\u1ea5n c\u00f4ng DDoS&nbsp;l\u1edbp 7&nbsp;(tham chi\u1ebfu \u0111\u1ebfn l\u1edbp 7 c\u1ee7a m\u00f4 h\u00ecnh OSI), m\u1ee5c ti\u00eau c\u1ee7a c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y l\u00e0 l\u00e0m c\u1ea1n ki\u1ec7t t\u00e0i nguy\u00ean c\u1ee7a m\u1ee5c ti\u00eau \u0111\u1ec3 t\u1ea1o ra h\u1ec7 qu\u1ea3 l\u00e0 t\u1eeb ch\u1ed1i d\u1ecbch &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[246,252],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e1c ki\u1ec3u t\u1ea5n c\u00f4ng DDoS kh\u00e1c nhau &#8226; 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