{"id":476131,"date":"2023-08-09T07:26:52","date_gmt":"2023-08-09T07:26:52","guid":{"rendered":""},"modified":"2023-09-05T11:12:07","modified_gmt":"2023-09-05T11:12:07","slug":"buffer-overflow-attack","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/buffer-overflow-attack\/","title":{"rendered":"T\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m"},"content":{"rendered":"<p>T\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ed9t m\u1ed1i \u0111e d\u1ecda an ninh m\u1ea1ng trong \u0111\u00f3 k\u1ebb t\u1ea5n c\u00f4ng c\u1ed1 g\u1eafng l\u00e0m qu\u00e1 t\u1ea3i b\u1ed9 \u0111\u1ec7m b\u1eb1ng c\u00e1ch g\u1eedi nhi\u1ec1u d\u1eef li\u1ec7u h\u01a1n d\u1ef1 \u0111\u1ecbnh ban \u0111\u1ea7u. Vi\u1ec7c tr\u00e0n d\u1eef li\u1ec7u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c th\u1ef1c thi m\u00e3 \u0111\u1ed9c, s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng ho\u1eb7c thay \u0111\u1ed5i d\u1eef li\u1ec7u quan tr\u1ecdng.<\/p>\n<h2>B\u1ed1i c\u1ea3nh l\u1ecbch s\u1eed v\u00e0 s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/h2>\n<p>Cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0o nh\u1eefng n\u0103m 1960 v\u00e0 \u0111\u1ea7u nh\u1eefng n\u0103m 1970, trong k\u1ef7 nguy\u00ean c\u1ee7a c\u00e1c m\u00e1y t\u00ednh l\u1edbn \u0111\u1eddi \u0111\u1ea7u. Tuy nhi\u00ean, ph\u1ea3i \u0111\u1ebfn nh\u1eefng n\u0103m 1980, nh\u1eefng l\u1ed7 h\u1ed5ng n\u00e0y m\u1edbi b\u1eaft \u0111\u1ea7u \u0111\u01b0\u1ee3c c\u00e1c t\u00e1c nh\u00e2n \u0111\u1ed9c h\u1ea1i hi\u1ec3u r\u00f5 h\u01a1n v\u00e0 khai th\u00e1c. Tr\u01b0\u1eddng h\u1ee3p t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 r\u1ed9ng r\u00e3i \u0111\u1ea7u ti\u00ean l\u00e0 Morris Worm v\u00e0o n\u0103m 1988. S\u00e2u n\u00e0y khai th\u00e1c l\u1ed7 h\u1ed5ng tr\u00e0n b\u1ed9 \u0111\u1ec7m trong d\u1ecbch v\u1ee5 m\u1ea1ng UNIX &#039;fingerd&#039;, g\u00e2y ra s\u1ef1 gi\u00e1n \u0111o\u1ea1n \u0111\u00e1ng k\u1ec3 cho ph\u1ea7n l\u1edbn Internet th\u1eddi k\u1ef3 \u0111\u1ea7u.<\/p>\n<h2>Th\u00f4ng tin chuy\u00ean s\u00e2u: T\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/h2>\n<p>M\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m c\u00f3 th\u1ec3 x\u1ea3y ra b\u1ea5t c\u1ee9 khi n\u00e0o m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh \u0111ang ghi d\u1eef li\u1ec7u v\u00e0o b\u1ed9 \u0111\u1ec7m v\u00e0 n\u00f3 kh\u00f4ng ki\u1ec3m tra dung l\u01b0\u1ee3ng d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0m tr\u00e0n dung l\u01b0\u1ee3ng c\u1ee7a b\u1ed9 \u0111\u1ec7m. N\u1ebfu b\u1ed9 \u0111\u1ec7m b\u1ecb tr\u00e0n, n\u00f3 s\u1ebd ghi \u0111\u00e8 l\u00ean b\u1ed9 nh\u1edb l\u00e2n c\u1eadn, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng ho\u1eb7c thay \u0111\u1ed5i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u trong kh\u00f4ng gian \u0111\u00f3. N\u1ebfu d\u1eef li\u1ec7u b\u1ecb ghi \u0111\u00e8 ch\u1ee9a m\u00e3 th\u1ef1c thi th\u00ec m\u00e3 \u0111\u00f3 c\u00f3 th\u1ec3 b\u1ecb thao t\u00fang \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng mong mu\u1ed1n c\u1ee7a k\u1ebb t\u1ea5n c\u00f4ng.<\/p>\n<p>V\u00ed d\u1ee5: k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 l\u1ee3i d\u1ee5ng l\u1ed7 h\u1ed5ng n\u00e0y \u0111\u1ec3 ch\u00e8n v\u00e0 th\u1ef1c thi m\u00e3 \u0111\u1ed9c, thay \u0111\u1ed5i \u0111\u01b0\u1eddng d\u1eabn th\u1ef1c thi c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh ho\u1eb7c khi\u1ebfn ch\u01b0\u01a1ng tr\u00ecnh g\u1eb7p s\u1ef1 c\u1ed1, khi\u1ebfn d\u1ecbch v\u1ee5 kh\u00f4ng kh\u1ea3 d\u1ee5ng. M\u1eb7c d\u00f9 l\u1ed7 h\u1ed5ng n\u00e0y c\u00f3 th\u1ec3 x\u1ea3y ra \u1edf nhi\u1ec1u ng\u00f4n ng\u1eef m\u00e3 h\u00f3a kh\u00e1c nhau, nh\u01b0ng n\u00f3 \u0111\u1eb7c bi\u1ec7t ph\u1ed5 bi\u1ebfn trong C v\u00e0 C++, v\u1ed1n kh\u00f4ng c\u00f3 c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 t\u00edch h\u1ee3p ch\u1ed1ng tr\u00e0n.<\/p>\n<h2>C\u01a1 ch\u1ebf t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/h2>\n<p>M\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3u r\u00f5 h\u01a1n b\u1eb1ng c\u00e1ch \u0111i s\u00e2u v\u00e0o ho\u1ea1t \u0111\u1ed9ng b\u00ean trong c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh. Khi m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh \u0111\u01b0\u1ee3c th\u1ef1c thi, m\u1ed9t kh\u00f4ng gian b\u1ed9 nh\u1edb ng\u0103n x\u1ebfp s\u1ebd \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed5 cho ch\u01b0\u01a1ng tr\u00ecnh \u0111\u00f3. Ng\u0103n x\u1ebfp n\u00e0y \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ph\u1ea7n kh\u00e1c nhau, c\u1ee5 th\u1ec3 l\u00e0 c\u00e1c bi\u1ebfn c\u1ee5c b\u1ed9 (b\u1ed9 \u0111\u1ec7m), d\u1eef li\u1ec7u \u0111i\u1ec1u khi\u1ec3n v\u00e0 c\u00e1c thanh ghi CPU. D\u1eef li\u1ec7u \u0111i\u1ec1u khi\u1ec3n bao g\u1ed3m Con tr\u1ecf c\u01a1 s\u1edf (BP), tr\u1ecf \u0111\u1ebfn c\u01a1 s\u1edf c\u1ee7a ng\u0103n x\u1ebfp v\u00e0 Con tr\u1ecf tr\u1ea3 v\u1ec1 (RP), cho bi\u1ebft \u0111i\u1ec3m th\u1ef1c hi\u1ec7n khi h\u00e0m hi\u1ec7n t\u1ea1i k\u1ebft th\u00fac.<\/p>\n<p>Khi k\u1ebb t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m, d\u1eef li\u1ec7u d\u01b0 th\u1eeba s\u1ebd tr\u00e0n sang v\u00f9ng d\u1eef li\u1ec7u \u0111i\u1ec1u khi\u1ec3n. N\u1ebfu k\u1ebb t\u1ea5n c\u00f4ng thi\u1ebft k\u1ebf \u0111\u1ea7u v\u00e0o m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn, ch\u00fang c\u00f3 th\u1ec3 ghi \u0111\u00e8 l\u00ean con tr\u1ecf tr\u1ea3 v\u1ec1 b\u1eb1ng m\u1ed9t gi\u00e1 tr\u1ecb m\u1edbi. Gi\u00e1 tr\u1ecb m\u1edbi n\u00e0y c\u00f3 th\u1ec3 tr\u1ecf \u0111\u1ebfn m\u1ed9t m\u00e3 \u0111\u1ed9c h\u1ea1i (c\u0169ng \u0111\u01b0\u1ee3c k\u1ebb t\u1ea5n c\u00f4ng cung c\u1ea5p nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a \u0111\u1ea7u v\u00e0o) v\u00e0 do \u0111\u00f3 khi\u1ebfn \u1ee9ng d\u1ee5ng th\u1ef1c thi m\u00e3 n\u00e0y.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng n\u1ed5i b\u1eadt c\u1ee7a c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m:<\/p>\n<ul>\n<li>\n<p><strong>Khai th\u00e1c \u0111i\u1ec3m y\u1ebfu c\u1ee7a l\u1eadp tr\u00ecnh:<\/strong> C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m ch\u1ee7 y\u1ebfu l\u1ee3i d\u1ee5ng th\u1ef1c t\u1ebf l\u00e0 m\u1ed9t s\u1ed1 ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh nh\u1ea5t \u0111\u1ecbnh, nh\u01b0 C v\u00e0 C++, kh\u00f4ng th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ef3 vi\u1ec7c ki\u1ec3m tra gi\u1edbi h\u1ea1n m\u1ea3ng n\u00e0o.<\/p>\n<\/li>\n<li>\n<p><strong>Thi h\u00e0nh B\u1ed9 lu\u1eadt t\u00f9y \u00fd:<\/strong> M\u1ed9t trong nh\u1eefng m\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a ki\u1ec3u t\u1ea5n c\u00f4ng n\u00e0y l\u00e0 th\u1ef1c thi m\u00e3 t\u00f9y \u00fd trong b\u1ed1i c\u1ea3nh b\u1ea3o m\u1eadt c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng.<\/p>\n<\/li>\n<li>\n<p><strong>N\u00e2ng cao \u0111\u1eb7c quy\u1ec1n:<\/strong> Nh\u1eefng cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 n\u00e2ng cao m\u1ee9c \u0111\u1eb7c quy\u1ec1n c\u1ee7a k\u1ebb t\u1ea5n c\u00f4ng trong h\u1ec7 th\u1ed1ng, c\u00f3 kh\u1ea3 n\u0103ng c\u1ea5p cho ch\u00fang quy\u1ec1n ki\u1ec3m so\u00e1t qu\u1ea3n tr\u1ecb.<\/p>\n<\/li>\n<li>\n<p><strong>Ti\u1ec1m n\u0103ng thi\u1ec7t h\u1ea1i tr\u00ean di\u1ec7n r\u1ed9ng:<\/strong> C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m c\u00f3 th\u1ec3 c\u00f3 s\u1ee9c t\u00e0n ph\u00e1 kh\u00e1 l\u1edbn, c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ra s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng ho\u1eb7c d\u1eabn \u0111\u1ebfn vi ph\u1ea1m d\u1eef li\u1ec7u nghi\u00eam tr\u1ecdng.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c ki\u1ec3u t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/h2>\n<p>C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean v\u00f9ng b\u1ed9 nh\u1edb m\u00e0 ch\u00fang nh\u1eafm t\u1edbi:<\/p>\n<ol>\n<li>\n<p><strong>T\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m d\u1ef1a tr\u00ean ng\u0103n x\u1ebfp:<\/strong> \u0110\u00e2y l\u00e0 lo\u1ea1i ph\u1ed5 bi\u1ebfn nh\u1ea5t, trong \u0111\u00f3 t\u00ecnh tr\u1ea1ng tr\u00e0n x\u1ea3y ra trong b\u1ed9 nh\u1edb ng\u0103n x\u1ebfp, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c bi\u1ebfn c\u1ee5c b\u1ed9 v\u00e0 \u0111\u1ecba ch\u1ec9 tr\u1ea3 v\u1ec1 c\u1ee7a h\u00e0m.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m d\u1ef1a tr\u00ean Heap:<\/strong> \u1ede \u0111\u00e2y, t\u00ecnh tr\u1ea1ng tr\u00e0n x\u1ea3y ra trong b\u1ed9 nh\u1edb heap, \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed5 \u0111\u1ed9ng trong th\u1eddi gian ch\u1ea1y v\u00e0 c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u1ef1a tr\u00ean ng\u0103n x\u1ebfp<\/td>\n<td>Tr\u00e0n x\u1ea3y ra trong b\u1ed9 nh\u1edb ng\u0103n x\u1ebfp<\/td>\n<\/tr>\n<tr>\n<td>D\u1ef1a tr\u00ean heap<\/td>\n<td>Tr\u00e0n x\u1ea3y ra trong b\u1ed9 nh\u1edb heap<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Th\u1ef1c hi\u1ec7n v\u00e0 bi\u1ec7n ph\u00e1p \u0111\u1ed1i ph\u00f3<\/h2>\n<p>C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng nhi\u1ec1u k\u1ef9 thu\u1eadt kh\u00e1c nhau, nh\u01b0 ki\u1ec3m tra fuzz ho\u1eb7c k\u1ef9 thu\u1eadt \u0111\u1ea3o ng\u01b0\u1ee3c. Tuy nhi\u00ean, c\u00f3 r\u1ea5t nhi\u1ec1u bi\u1ec7n ph\u00e1p \u0111\u1ed1i ph\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ng\u0103n ch\u1eb7n ch\u00fang:<\/p>\n<ul>\n<li>\n<p><strong>Ki\u1ec3m tra gi\u1edbi h\u1ea1n:<\/strong> Th\u1ef1c thi gi\u1edbi h\u1ea1n ki\u1ec3m tra tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c tham chi\u1ebfu m\u1ea3ng v\u00e0 con tr\u1ecf trong m\u00e3.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u00e1nh gi\u00e1 m\u00e3 v\u00e0 ph\u00e2n t\u00edch t\u0129nh:<\/strong> Th\u01b0\u1eddng xuy\u00ean xem l\u1ea1i m\u00e3 v\u00e0 ti\u1ebfn h\u00e0nh ph\u00e2n t\u00edch t\u0129nh \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c \u0111i\u1ec3m y\u1ebfu ti\u1ec1m \u1ea9n.<\/p>\n<\/li>\n<li>\n<p><strong>Ng\u1eabu nhi\u00ean h\u00f3a b\u1ed1 c\u1ee5c kh\u00f4ng gian \u0111\u1ecba ch\u1ec9 (ASLR):<\/strong> Ch\u1ecdn ng\u1eabu nhi\u00ean v\u1ecb tr\u00ed n\u01a1i c\u00e1c t\u1ec7p th\u1ef1c thi c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c t\u1ea3i v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec3 khi\u1ebfn k\u1ebb t\u1ea5n c\u00f4ng kh\u00f3 d\u1ef1 \u0111o\u00e1n \u0111\u1ecba ch\u1ec9 m\u1ee5c ti\u00eau h\u01a1n.<\/p>\n<\/li>\n<li>\n<p><strong>Ng\u0103n x\u1ebfp kh\u00f4ng th\u1ec3 th\u1ef1c thi:<\/strong> \u0110\u00e1nh d\u1ea5u c\u00e1c v\u00f9ng b\u1ed9 nh\u1edb nh\u01b0 ng\u0103n x\u1ebfp v\u00e0 \u0111\u1ed1ng l\u00e0 kh\u00f4ng th\u1ec3 th\u1ef1c thi \u0111\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y ng\u0103n k\u1ebb t\u1ea5n c\u00f4ng ch\u1ea1y m\u00e3 c\u1ee7a ch\u00fang t\u1eeb c\u00e1c v\u00f9ng n\u00e0y.<\/p>\n<\/li>\n<\/ul>\n<h2>So s\u00e1nh v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m<\/h2>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>Tr\u00e0n b\u1ed9 nh\u1edb<\/th>\n<th>Ti\u00eam SQL<\/th>\n<th>T\u1eadp l\u1ec7nh ch\u00e9o trang (XSS)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u1ee5c ti\u00eau<\/td>\n<td>B\u1ed9 nh\u1edb \u1ee9ng d\u1ee5ng<\/td>\n<td>C\u01a1 s\u1edf d\u1eef li\u1ec7u<\/td>\n<td>Tr\u00ecnh duy\u1ec7t c\u1ee7a ng\u01b0\u1eddi d\u00f9ng<\/td>\n<\/tr>\n<tr>\n<td>L\u1ed7 h\u1ed5ng ng\u00f4n ng\u1eef<\/td>\n<td>Ph\u1ed5 bi\u1ebfn trong C\/C++<\/td>\n<td>SQL<\/td>\n<td>HTML\/JavaScript<\/td>\n<\/tr>\n<tr>\n<td>K\u1ef9 thu\u1eadt ph\u00f2ng ng\u1eeba<\/td>\n<td>Ki\u1ec3m tra gi\u1edbi h\u1ea1n, ASLR, ng\u0103n x\u1ebfp kh\u00f4ng th\u1ec3 th\u1ef1c thi<\/td>\n<td>B\u00e1o c\u00e1o \u0111\u00e3 chu\u1ea9n b\u1ecb s\u1eb5n, tho\u00e1t kh\u1ecfi \u0111\u1ea7u v\u00e0o c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, \u0111\u1eb7c quy\u1ec1n t\u1ed1i thi\u1ec3u<\/td>\n<td>X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o, M\u00e3 h\u00f3a \u0111\u1ea7u ra, Cookie httpOnly<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Tri\u1ec3n v\u1ecdng t\u01b0\u01a1ng lai<\/h2>\n<p>V\u1edbi nh\u1eefng ti\u1ebfn b\u1ed9 trong tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o v\u00e0 h\u1ecdc m\u00e1y, vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m d\u1ef1 ki\u1ebfn s\u1ebd \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n. C\u00e1c h\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n m\u1ed1i \u0111e d\u1ecda \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi AI s\u1ebd c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c ki\u1ec3u t\u1ea5n c\u00f4ng ph\u1ee9c t\u1ea1p ch\u00ednh x\u00e1c h\u01a1n v\u00e0 nhanh h\u01a1n c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7n t\u1ea1i.<\/p>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c ng\u00f4n ng\u1eef c\u00f3 kh\u1ea3 n\u0103ng qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb t\u1ed1t h\u01a1n (nh\u01b0 Rust) c\u0169ng c\u00f3 th\u1ec3 t\u0103ng l\u00ean. Nh\u1eefng ng\u00f4n ng\u1eef n\u00e0y c\u00f3 th\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m theo thi\u1ebft k\u1ebf, khi\u1ebfn ch\u00fang tr\u1edf th\u00e0nh m\u1ed9t l\u1ef1a ch\u1ecdn h\u1ea5p d\u1eabn \u0111\u1ec3 ph\u00e1t tri\u1ec3n c\u00e1c \u1ee9ng d\u1ee5ng an to\u00e0n.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m. B\u1eb1ng c\u00e1ch \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u00e1y ch\u1ee7, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 ph\u00e2n t\u00edch v\u00e0 l\u1ecdc l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp, gi\u00fap ph\u00e1t hi\u1ec7n h\u00e0nh vi \u0111\u00e1ng ng\u1edd c\u00f3 th\u1ec3 b\u00e1o hi\u1ec7u m\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m.<\/p>\n<p>H\u01a1n n\u1eefa, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u1ec3 ch\u1ec9 cho ph\u00e9p c\u00e1c l\u1ec7nh an to\u00e0n \u0111\u00e3 bi\u1ebft, ng\u0103n ch\u1eb7n vi\u1ec7c th\u1ef1c thi m\u00e3 t\u00f9y \u00fd tr\u00ean h\u1ec7 th\u1ed1ng \u0111\u00edch. B\u1eb1ng c\u00e1ch \u0111\u00f3, ngay c\u1ea3 khi k\u1ebb t\u1ea5n c\u00f4ng c\u1ed1 g\u1eafng khai th\u00e1c l\u1ed7 h\u1ed5ng tr\u00e0n b\u1ed9 \u0111\u1ec7m, c\u00e1c h\u00e0nh \u0111\u1ed9ng c\u00f3 h\u1ea1i m\u00e0 ch\u00fang mu\u1ed1n th\u1ef1c hi\u1ec7n s\u1ebd b\u1ecb m\u00e1y ch\u1ee7 proxy ch\u1eb7n.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.owasp.org\/index.php\/Buffer_Overflow\" target=\"_new\" rel=\"noopener nofollow\">OWASP: Tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/a><\/li>\n<li><a href=\"https:\/\/cwe.mitre.org\/data\/definitions\/120.html\" target=\"_new\" rel=\"noopener nofollow\">CWE-120: Sao ch\u00e9p b\u1ed9 \u0111\u1ec7m m\u00e0 kh\u00f4ng ki\u1ec3m tra k\u00edch th\u01b0\u1edbc \u0111\u1ea7u v\u00e0o (&#039;Tr\u00e0n b\u1ed9 \u0111\u1ec7m c\u1ed5 \u0111i\u1ec3n&#039;)<\/a><\/li>\n<li><a href=\"https:\/\/www.nist.gov\/cyberframework\/online-learning\/understanding-buffer-overflow-attacks\" target=\"_new\" rel=\"noopener nofollow\">NIST: T\u00ecm hi\u1ec3u c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/a><\/li>\n<li><a href=\"https:\/\/www.imperva.com\/learn\/application-security\/buffer-overflow\/\" target=\"_new\" rel=\"noopener nofollow\">H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng tr\u00e0n b\u1ed9 \u0111\u1ec7m<\/a><\/li>\n<\/ol>","protected":false},"featured_media":476132,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476131","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Buffer Overflow Attack: Unpacking the Details<\/mark>","faq_items":[{"question":"What is a buffer overflow attack?","answer":"<p>A buffer overflow attack is a cyber security threat where an attacker attempts to overload the buffer by sending more data than it was intended to hold. This can result in the execution of malicious code, system crash, or alteration of crucial data.<\/p>"},{"question":"When was the first buffer overflow attack reported?","answer":"<p>The first significant publicized instance of a buffer overflow attack was the Morris Worm in 1988. It exploited a buffer overflow vulnerability in the UNIX 'fingerd' network service, causing significant disruption to large portions of the early Internet.<\/p>"},{"question":"What causes a buffer overflow attack?","answer":"<p>Buffer overflow attacks primarily occur due to a lack of array bounds checking in programming languages such as C and C++. When a program writes data into a buffer and does not verify the volume of data, it can exceed the buffer's capacity, overwriting adjacent memory and potentially leading to the execution of malicious code.<\/p>"},{"question":"What are some key features of buffer overflow attacks?","answer":"<p>Buffer overflow attacks exploit programming weaknesses, can execute arbitrary code, often aim to elevate the attacker's privilege level, and can cause widespread damage, including system crashes and significant data breaches.<\/p>"},{"question":"What are the types of buffer overflow attacks?","answer":"<p>Buffer overflow attacks can be categorized based on the memory area they target: Stack-based buffer overflow attacks where the overflow occurs in the stack memory, and Heap-based buffer overflow attacks where the overflow occurs in the heap memory.<\/p>"},{"question":"How can buffer overflow attacks be prevented?","answer":"<p>Preventive measures include implementing bounds checking, conducting code reviews and static analysis, using Address Space Layout Randomization (ASLR), and marking memory regions such as stack and heap as non-executable.<\/p>"},{"question":"What is the future perspective on buffer overflow attacks?","answer":"<p>Future advancements in artificial intelligence and machine learning are expected to improve the detection and prevention of buffer overflow attacks. Furthermore, increased usage of languages with better memory management could inherently prevent such attacks.<\/p>"},{"question":"How are proxy servers associated with buffer overflow attacks?","answer":"<p>Proxy servers can play a key role in preventing buffer overflow attacks. They can analyze and filter traffic, detect suspicious behavior, and can be configured to only allow known safe commands, preventing the execution of arbitrary code on the target system.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476131\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/476132"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}