{"id":9824,"date":"2019-10-01T13:19:25","date_gmt":"2019-10-01T06:19:25","guid":{"rendered":""},"modified":"2024-06-07T16:11:48","modified_gmt":"2024-06-07T09:11:48","slug":"dns-amplification-attack-ddos-khuech-dai-tu-may-chu-dns","status":"publish","type":"post","link":"https:\/\/vnso.vn\/en\/dns-amplification-attack-ddos-khuech-dai-tu-may-chu-dns\/","title":{"rendered":"DNS Amplification Attack! DDoS khu\u1ebfch \u0111\u1ea1i t\u1eeb m\u00e1y ch\u1ee7 DNS!"},"content":{"rendered":"

T\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i m\u00e1y ch\u1ee7 DNS<\/a> l\u00e0 t\u1ea5n c\u00f4ng DDoS d\u1ef1a tr\u00ean m\u1ed9t l\u01b0\u1ee3ng l\u1edbn c\u00e1c g\u00f3i tin m\u00e0 k\u1ebb t\u1ea5n c\u00f4ng t\u1eadn d\u1ee5ng m\u00e1y ch\u1ee7 ph\u00e2n gi\u1ea3i DNS \u0111\u1ec3 l\u00e0m qu\u00e1 t\u1ea3i m\u00e1y ch\u1ee7. H\u1ec7 th\u1ed1ng m\u1ea1ng v\u1edbi l\u01b0\u1ee3ng l\u1edbn g\u00f3i tin \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i l\u00e0m cho m\u00e1y ch\u1ee7 hay h\u1ec7 th\u1ed1ng m\u1ea1ng xung quanh kh\u00f4ng truy c\u1eadp \u0111\u01b0\u1ee3c.<\/span><\/p>\n

1. T\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i DNS nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/span><\/h2>\n

T\u1ea5t c\u1ea3 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i \u0111\u1ec1u khai th\u00e1c s\u1ef1 ch\u00eanh l\u1ec7ch v\u1ec1 b\u0103ng th\u00f4ng c\u1ee7a k\u1ebb t\u1ea5n c\u00f4ng v\u00e0 t\u00e0i nguy\u00ean c\u1ee7a n\u1ea1n nh\u00e2n. Khi c\u00e1c g\u00f3i tin \u0111\u01b0\u1ee3c ph\u00f3ng to qua nhi\u1ec1u request. Tr\u1ea3 v\u1ec1 l\u01b0\u1ee3ng l\u1edbn c\u00e1c g\u00f3i ph\u1ea3n h\u1ed3i c\u00f3 th\u1ec3 ph\u00e1 v\u1ee1 h\u1ea1 t\u1ea7ng m\u1ea1ng. B\u1eb1ng c\u00e1ch g\u1eedi nh\u1eefng y\u00eau c\u1ea7u nh\u1ecf v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng g\u00f3i ph\u1ea3n h\u1ed3i l\u1edbn. K\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ea1ng botnet \u0111\u1ec3 g\u1eedi nh\u1eefng y\u00eau c\u1ea7u nh\u01b0 v\u1eady. \u0110\u1ed3ng th\u1eddi nh\u1eadn \u0111\u01b0\u1ee3c c\u1ea3 l\u1ee3i \u00edch t\u1eeb vi\u1ec7c t\u1ea5n c\u00f4ng c\u0169ng nh\u01b0 s\u1ef1 \u1ea9n danh.<\/span><\/p>\n

M\u1ed9t con bot trong t\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i DNS c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c di\u1ec5n t\u1ea3 nh\u01b0 khi b\u1ea1n g\u1ecdi \u0111\u1ebfn nh\u00e0 h\u00e0ng v\u00e0 n\u00f3i \u201ccho t\u00f4i m\u1ed7i m\u00f3n m\u1ed9t ph\u1ea7n\u201d. Y\u00eau c\u1ea7u nh\u00e2n vi\u00ean g\u1ecdi l\u1ea1i \u0111\u1ecdc to\u00e0n b\u1ed9 nh\u1eefng m\u00f3n b\u1ea1n \u0111\u00e3 g\u1ecdi. Khi \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u cho s\u1ed1 \u0111i\u1ec7n tho\u1ea1i \u0111\u1ec3 g\u1ecdi l\u1ea1i b\u1ea1n l\u1ea1i cho s\u1ed1 \u0111i\u1ec7n tho\u1ea1i c\u1ee7a n\u1ea1n nh\u00e2n. N\u1ea1n nh\u00e2n nh\u1eadn \u0111\u01b0\u1ee3c \u0111i\u1ec7n tho\u1ea1i t\u1eeb nh\u00e0 h\u00e0ng v\u1edbi l\u01b0\u1ee3ng l\u1edbn th\u00f4ng tin m\u00e0 h\u1ecd kh\u00f4ng y\u00eau c\u1ea7u.<\/span><\/p>\n

T\u01b0\u01a1ng t\u1ef1 v\u1edbi c\u00e1ch di\u1ec5n t\u1ea3 tr\u00ean m\u1ed7i con bot g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn c\u00e1c m\u00e1y ch\u1ee7 ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n (DNS resolver) v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IP gi\u1ea3 m\u1ea1o. IP gi\u1ea3 m\u1ea1o n\u00e0y l\u00e0 IP th\u1eadt c\u1ee7a m\u1ed9t n\u1ea1n nh\u00e2n m\u00e0 k\u1ebb t\u1ea5n c\u00f4ng mu\u1ed1n t\u1ea5n c\u00f4ng. Sau \u0111\u00f3 n\u1ea1n nh\u00e2n nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i t\u1eeb m\u00e1y ch\u1ee7 ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n. \u0110\u1ec3 t\u1ea1o \u0111\u01b0\u1ee3c m\u1ed9t l\u01b0\u1ee3ng l\u1edbn traffic k\u1ebb t\u1ea5n c\u00f4ng s\u1ebd g\u1eedi m\u1ed9t l\u01b0\u1ee3ng c\u00e1c y\u00eau c\u1ea7u \u0111\u1ec3 l\u00e0m sao nh\u1eadn \u0111\u01b0\u1ee3c c\u00e0ng nhi\u1ec1u ph\u1ea3n h\u1ed3i t\u1eeb DNS resolver c\u00e0ng t\u1ed1t. K\u1ebft qu\u1ea3 l\u00e0 n\u1ea1n nh\u00e2n nh\u1eadn \u0111\u01b0\u1ee3c s\u1ef1 khu\u1ebfch \u0111\u1ea1i traffic t\u1eeb k\u1ebb t\u1ea5n c\u00f4ng v\u00e0 h\u1ec7 th\u1ed1ng m\u1ea1ng<\/span><\/p>\n

\"M\u1ed9t

M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 t\u1ea5n c\u00f4ng ddos DNS Amplification Attack <\/span>c\u1ee7a h\u1ecd t\u1eafc ngh\u1ebdn v\u1edbi traffic gi\u1ea3 m\u1ea1o d\u1eabn \u0111\u1ebfn t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5.<\/span><\/p><\/div>\n

T\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i m\u00e1y ch\u1ee7 DNS<\/a> c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia ra th\u00e0nh 4 b\u01b0\u1edbc:<\/strong><\/em><\/span><\/p>\n

    \n
  1. K\u1ebb t\u1ea5n c\u00f4ng s\u1eed d\u1ee5ng m\u00e1y \u0111\u1ea7u cu\u1ed1i g\u1eedi g\u00f3i UDP v\u1edbi IP gi\u1ea3 m\u1ea1o t\u1edbi DNS resolver. IP gi\u1ea3 m\u1ea1o l\u00e0 IP th\u1eadt c\u1ee7a n\u1ea1n nh\u00e2n.<\/span><\/li>\n
  2. M\u1ed7i g\u00f3i tin UDP \u0111\u1ec1u g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn DNS resolver. Th\u01b0\u1eddng c\u00e1c gi\u00e1 tr\u1ecb g\u1eedi \u0111i l\u00e0 ANY \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i l\u1edbn nh\u1ea5t c\u00f3 th\u1ec3.<\/span><\/li>\n
  3. Sau khi nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u DNS resolver s\u1ebd g\u1eedi ph\u1ea3n h\u1ed3i v\u1ec1 cho IP b\u1ecb gi\u1ea3 m\u1ea1o.<\/span><\/li>\n
  4. M\u00e1y ch\u1ee7 c\u1ee7a n\u1ea1n nh\u00e2n v\u1edbi IP b\u1ecb gi\u1ea3 m\u1ea1o s\u1ebd nh\u1eadn l\u01b0\u1ee3ng l\u1edbn c\u00e1c g\u00f3i tin ph\u1ea3n h\u1ed3i n\u00e0y. D\u1eabn \u0111\u1ebfn qu\u00e1 t\u1ea3i m\u00e1y ch\u1ee7 v\u00e0 h\u1ea1 t\u1ea7ng m\u1ea1ng v\u00e0 t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5.<\/span><\/li>\n<\/ol>\n

    V\u1edbi ch\u1ec9 m\u1ed9t v\u00e0i request th\u00ec kh\u00f4ng \u0111\u1ee7 \u0111\u1ec3 \u0111\u00e1nh s\u1eadp m\u1ed9t h\u1ec7 th\u1ed1ng. Tuy nhi\u00ean, khi li\u00ean t\u1ee5c g\u1eedi nhi\u1ec1u l\u1ea7n c\u00e1c g\u00f3i tin y\u00eau c\u1ea7u v\u00e0 DNS resolver v\u00f4 t\u00ecnh s\u1ebd l\u00e0 m\u00e1y m\u00e0 k\u1ebb t\u1ea5n c\u00f4ng. Ch\u00fang s\u1ebd l\u1ee3i d\u1ee5ng \u0111\u1ec3 khu\u1ebfch \u0111\u1ea1i c\u00e1c g\u00f3i tin ph\u1ea3n h\u1ed3i.<\/span><\/p>\n

    2. C\u00e1ch gi\u1ea3m thi\u1ec3u t\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i DNS?<\/strong><\/em><\/span><\/h2>\n

    \u0110\u1ed1i v\u1edbi c\u00e1c c\u00e1 nh\u00e2n, c\u00f4ng ty ch\u1ea1y website hay d\u1ecbch v\u1ee5 c\u00e1c c\u00e1ch gi\u1ea3m thi\u1ec3u t\u1ea5n c\u00f4ng r\u1ea5t h\u1ea1n ch\u1ebf. Do l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp t\u0103ng cao h\u1ec7 th\u1ed1ng m\u1ea1ng c\u1ee7a m\u00e1y ch\u1ee7 b\u1ecb \u1ea3nh h\u01b0\u1edfng. Nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 m\u1ea1ng ho\u1eb7c cung c\u1ea5p c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng c\u0169ng c\u00f3 th\u1ec3 kh\u00f4ng x\u1eed l\u00fd \u0111\u01b0\u1ee3c l\u01b0\u1ee3ng d\u1eef li\u1ec7u n\u00e0y d\u1eabn \u0111\u1ebfn b\u1ecb qu\u00e1 t\u1ea3i. Do \u0111\u00f3 c\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 s\u1ebd \u0111\u1ea9y t\u1ea5t c\u1ea3 traffic \u0111\u1ebfn m\u00e1y ch\u1ee7 b\u1ecb t\u1ea5n c\u00f4ng v\u00e0o h\u1ed1 \u0111en \u0111\u1ec3 b\u1ea3o v\u1ec7 ch\u00ednh m\u00ecnh v\u00e0 khi\u1ebfn site c\u1ee7a c\u00e1c c\u00e1c nh\u00e2n, c\u00f4ng ty n\u00e0y offline.<\/span><\/p>\n

    2.1. Gi\u1ea3m thi\u1ec3u s\u1ed1 l\u01b0\u1ee3ng open DNS resolvers<\/strong><\/em><\/span><\/h3>\n

    M\u1ed9t th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu trong t\u1ea5n c\u00f4ng b\u1eb1ng khu\u1ebfch \u0111\u1ea1i DNS l\u00e0 c\u00e1c open DNS resolvers. B\u1eb1ng c\u00e1ch c\u1ea5u h\u00ecnh c\u00e1c DNS resolvers m\u1ed9t c\u00e1ch c\u1ea9u th\u1ea3. Ph\u00e1t t\u00e1n ra m\u1ea1ng internet nh\u1eefng k\u1ebb t\u1ea5n c\u00f4ng t\u00ecm ki\u1ebfm ra n\u00f3. \u0110\u1ed3ng th\u1eddi t\u1eadn d\u1ee5ng \u0111\u1ec3 l\u00e0m ra c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng. C\u00e1c DNS resolver ch\u1ec9 n\u00ean cung c\u1ea5p vi\u1ec7c ph\u00e2n d\u1ea3i t\u00ean mi\u1ec1n \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb \u0111\u00e1ng tin c\u1eady. Trong tr\u01b0\u1eddng h\u1ee3p c\u00e1c t\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i DNS c\u00e1c DNS resolver tr\u1ea3 l\u1eddi \u0111\u1ebfn h\u1ea7u h\u1ebft t\u1ea5t c\u1ea3 c\u00e1c y\u00eau c\u1ea7u t\u1eeb m\u1ecdi n\u01a1i tr\u00ean internet. H\u1ea1n ch\u1ebf c\u00e1c DNS resolver v\u00e0 ch\u1ec9 cho c\u00e1c DNS resolver ph\u1ea3n h\u1ed3i \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb \u0111\u00e1ng tin c\u1eady l\u00e0m cho c\u00e1c DNS resolver n\u00e0y kh\u00f4ng c\u00f2n l\u00e0 ph\u01b0\u01a1ng ti\u1ec7n l\u00fd t\u01b0\u1edfng \u0111\u1ec3 th\u1ef1c hi\u1ec7n t\u1ea5n c\u00f4ng<\/a> n\u1eefa.<\/span><\/p>\n

    2.2. Ki\u1ec3m tra IP ngu\u1ed3n \u2013 ng\u0103n ch\u1eb7n c\u00e1c g\u00f3i tin gi\u1ea3 m\u1ea1o \u0111i ra kh\u1ecfi m\u1ea1ng<\/strong><\/em><\/span><\/h3>\n

    B\u1edfi v\u00ec c\u00e1c y\u00eau c\u1ea7u UDP g\u1eedi \u0111i b\u1edfi m\u1ea1ng botnet c\u1ee7a k\u1ebb t\u1ea5n c\u00f4ng \u0111\u1ec1u ph\u1ea3i gi\u1ea3 m\u1ea1o IP ngu\u1ed3n th\u00e0nh IP c\u1ee7a n\u1ea1n nh\u00e2n. M\u1ed9t gi\u1ea3i ph\u00e1p then ch\u1ed1t \u0111\u1ec3 gi\u1ea3m t\u00ednh hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c t\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i b\u1eb1ng giao th\u1ee9c UDP l\u00e0 c\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 m\u1ea1ng (ISP) l\u1ecdc v\u00e0 lo\u1ea1i b\u1ecf c\u00e1c g\u00f3i tin \u0111i ra v\u1edbi IP gi\u1ea3 m\u1ea1o. N\u1ebfu g\u00f3i tin \u0111i ra kh\u1ecfi m\u1ea1ng v\u1edbi IP ngu\u1ed3n kh\u00e1c v\u1edbi IP trong m\u1ea1ng \u0111\u00f3 th\u00ec ISP s\u1ebd lo\u1ea1i b\u1ecf c\u00e1c g\u00f3i tin n\u00e0y v\u00e0 g\u1ea7n nh\u01b0 c\u00e1c g\u00f3i tin gi\u1ea3 m\u1ea1o s\u1ebd \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf.<\/span><\/p>\n

    Xem th\u00eam c\u00e1c g\u00f3i Thu\u00ea M\u00e1y Ch\u1ee7 t\u1ea1i VNSO<\/span><\/a><\/span><\/p>","protected":false},"excerpt":{"rendered":"

    T\u1ea5n c\u00f4ng khu\u1ebfch \u0111\u1ea1i m\u00e1y ch\u1ee7 DNS l\u00e0 t\u1ea5n c\u00f4ng DDoS d\u1ef1a tr\u00ean m\u1ed9t l\u01b0\u1ee3ng l\u1edbn c\u00e1c g\u00f3i tin m\u00e0 k\u1ebb t\u1ea5n c\u00f4ng t\u1eadn d\u1ee5ng m\u00e1y ch\u1ee7 ph\u00e2n gi\u1ea3i DNS \u0111\u1ec3 l\u00e0m qu\u00e1 t\u1ea3i m\u00e1y ch\u1ee7. H\u1ec7 th\u1ed1ng m\u1ea1ng v\u1edbi l\u01b0\u1ee3ng l\u1edbn g\u00f3i tin \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i l\u00e0m cho m\u00e1y ch\u1ee7 hay h\u1ec7 th\u1ed1ng m\u1ea1ng […]<\/p>","protected":false},"author":1,"featured_media":11267,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[156],"tags":[73,159,158,122,84,60],"yoast_head":"\nDNS Amplification Attack! 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