{"id":476474,"date":"2023-08-09T07:29:55","date_gmt":"2023-08-09T07:29:55","guid":{"rendered":""},"modified":"2023-09-05T11:12:51","modified_gmt":"2023-09-05T11:12:51","slug":"crlf-injection","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/crlf-injection\/","title":{"rendered":"ti\u00eam crlf"},"content":{"rendered":"<p>CRLF Ti\u00eam, vi\u1ebft t\u1eaft c\u1ee7a Carriage Return Line Feed Feed, l\u00e0 m\u1ed9t d\u1ea1ng l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt c\u1ee7a \u1ee9ng d\u1ee5ng web. Vi\u1ec7c ch\u00e8n m\u00e3 l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt ch\u00e8n m\u00e3 bao g\u1ed3m vi\u1ec7c x\u00e2m nh\u1eadp c\u00e1c chu\u1ed7i CRLF v\u00e0o m\u1ed9t \u1ee9ng d\u1ee5ng ho\u1eb7c m\u1ed9t trang web. Vi\u1ec7c ti\u00eam n\u00e0y ch\u1ee7 y\u1ebfu \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c ti\u00eau \u0111\u1ec1 HTTP v\u00e0 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nhi\u1ec1u m\u1ed1i \u0111e d\u1ecda kh\u00e1c nhau nh\u01b0 T\u00e1ch ph\u1ea3n h\u1ed3i HTTP, T\u1eadp l\u1ec7nh ch\u00e9o trang (XSS), v.v.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 b\u1ed1i c\u1ea3nh l\u1ecbch s\u1eed c\u1ee7a vi\u1ec7c ti\u00eam CRLF<\/h2>\n<p>Thu\u1eadt ng\u1eef &#039;Ti\u00eam CRLF&#039; c\u0169ng l\u00e2u \u0111\u1eddi nh\u01b0 ch\u00ednh giao th\u1ee9c HTTP, b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a Internet. Chu\u1ed7i CRLF (k\u00fd hi\u1ec7u l\u00e0 rn) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ec3u th\u1ecb d\u00f2ng m\u1edbi (cu\u1ed1i d\u00f2ng) trong nhi\u1ec1u ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh. \u0110i\u1ec1u n\u00e0y b\u1eaft ngu\u1ed3n t\u1eeb th\u1eddi m\u00e1y \u0111\u00e1nh ch\u1eef trong \u0111\u00f3 &#039;Carriage Return&#039; (CR) s\u1ebd \u0111\u1eb7t l\u1ea1i v\u1ecb tr\u00ed c\u1ee7a thi\u1ebft b\u1ecb v\u1ec1 \u0111\u1ea7u d\u00f2ng, trong khi &#039;Line Feed&#039; (LF) s\u1ebd di chuy\u1ec3n thi\u1ebft b\u1ecb xu\u1ed1ng m\u1ed9t d\u00f2ng.<\/p>\n<p>Nh\u1eefng \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean v\u1ec1 vi\u1ec7c s\u1eed d\u1ee5ng sai hay c\u00f2n g\u1ecdi l\u00e0 &quot;ti\u00eam&quot; c\u1ee7a n\u00f3 c\u00f3 t\u1eeb cu\u1ed1i nh\u1eefng n\u0103m 1990 v\u00e0 \u0111\u1ea7u nh\u1eefng n\u0103m 2000 khi c\u00e1c \u1ee9ng d\u1ee5ng web tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 b\u1ea3o m\u1eadt b\u1eaft \u0111\u1ea7u ph\u00e1t tri\u1ec3n.<\/p>\n<h2>\u0110i s\u00e2u v\u00e0o vi\u1ec7c ti\u00eam CRLF<\/h2>\n<p>CRLF Ti\u00eam l\u00e0 m\u1ed9t thao t\u00e1c c\u1ee7a chu\u1ed7i CRLF \u0111\u1ec3 t\u1eadn d\u1ee5ng c\u00e1ch x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng web v\u00e0 m\u00e1y ch\u1ee7. B\u1eb1ng c\u00e1ch ch\u00e8n c\u00e1c chu\u1ed7i CRLF kh\u00f4ng mong mu\u1ed1n, k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 thao t\u00fang lu\u1ed3ng d\u1eef li\u1ec7u c\u1ee7a \u1ee9ng d\u1ee5ng, d\u1eabn \u0111\u1ebfn vi ph\u1ea1m an ninh.<\/p>\n<p>M\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng Ti\u00eam CRLF \u0111i\u1ec3n h\u00ecnh c\u00f3 th\u1ec3 bao g\u1ed3m vi\u1ec7c th\u00eam chu\u1ed7i CRLF v\u00e0o tr\u01b0\u1eddng nh\u1eadp c\u1ee7a ng\u01b0\u1eddi d\u00f9ng trong \u1ee9ng d\u1ee5ng web \u0111\u1ec3 \u0111\u00e1nh l\u1eeba \u1ee9ng d\u1ee5ng ngh\u0129 r\u1eb1ng m\u1ed9t d\u00f2ng m\u1edbi \u0111\u00e3 b\u1eaft \u0111\u1ea7u. Trong ti\u00eau \u0111\u1ec1 HTTP, m\u1ed9t ph\u1ea7n thi\u1ebft y\u1ebfu c\u1ee7a giao ti\u1ebfp tr\u00ean Internet, vi\u1ec7c ch\u00e8n CRLF c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ph\u00e2n t\u00e1ch ph\u1ea3n h\u1ed3i HTTP, trong \u0111\u00f3 k\u1ebb t\u1ea5n c\u00f4ng \u0111\u1ed9c h\u1ea1i c\u00f3 th\u1ec3 l\u1eeba m\u00e1y ch\u1ee7 g\u1eedi ph\u1ea3n h\u1ed3i HTTP \u0111\u00e3 thay \u0111\u1ed5i, d\u1eabn \u0111\u1ebfn c\u00e1c l\u1ed7 h\u1ed5ng ti\u1ec1m \u1ea9n.<\/p>\n<h2>C\u01a1 ch\u1ebf b\u00ean trong c\u1ee7a vi\u1ec7c ti\u00eam CRLF<\/h2>\n<p>T\u00ednh n\u0103ng ch\u00e8n CRLF ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch ch\u00e8n c\u00e1c chu\u1ed7i CRLF v\u00e0o lu\u1ed3ng d\u1eef li\u1ec7u d\u1ef1 ki\u1ebfn c\u1ee7a \u1ee9ng d\u1ee5ng. B\u1eb1ng c\u00e1ch \u0111\u00f3, k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 thao t\u00fang h\u1ec7 th\u1ed1ng \u0111\u1ec3 nh\u1eadn ra nh\u1eefng l\u1ea7n ti\u00eam n\u00e0y l\u00e0 c\u00e1c l\u1ec7nh ho\u1eb7c ch\u1ec9 th\u1ecb h\u1ee3p ph\u00e1p.<\/p>\n<p>Ch\u1eb3ng h\u1ea1n, trong tr\u01b0\u1eddng h\u1ee3p Ph\u00e2n t\u00e1ch ph\u1ea3n h\u1ed3i HTTP, k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 nh\u1eadp m\u1ed9t chu\u1ed7i bao g\u1ed3m c\u00e1c chu\u1ed7i CRLF, theo sau l\u00e0 c\u00e1c ti\u00eau \u0111\u1ec1 ho\u1eb7c n\u1ed9i dung HTTP b\u1ed5 sung. \u0110i\u1ec1u n\u00e0y khi\u1ebfn \u1ee9ng d\u1ee5ng ngh\u0129 r\u1eb1ng c\u00e1c ti\u00eau \u0111\u1ec1 \u0111\u00e3 k\u1ebft th\u00fac v\u00e0 c\u00e1c ti\u00eau \u0111\u1ec1 m\u1edbi \u0111\u00e3 b\u1eaft \u0111\u1ea7u, t\u1eeb \u0111\u00f3 cho ph\u00e9p k\u1ebb t\u1ea5n c\u00f4ng ki\u1ec3m so\u00e1t c\u00e1c ti\u00eau \u0111\u1ec1 ph\u1ea3n h\u1ed3i c\u1ee7a ph\u1ea3n h\u1ed3i HTTP.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a CRLF ti\u00eam<\/h2>\n<p>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam CRLF bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p>Thao t\u00e1c v\u1edbi c\u00e1c chu\u1ed7i CRLF: T\u00ednh n\u0103ng ch\u00ednh c\u1ee7a vi\u1ec7c ch\u00e8n CRLF l\u00e0 vi\u1ec7c b\u1ed5 sung c\u00e1c chu\u1ed7i CRLF m\u1ed9t c\u00e1ch b\u1ea5t ng\u1edd v\u00e0o c\u00e1c tr\u01b0\u1eddng do ng\u01b0\u1eddi d\u00f9ng nh\u1eadp ho\u1eb7c ti\u00eau \u0111\u1ec1 HTTP.<\/p>\n<\/li>\n<li>\n<p>T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn lu\u1ed3ng d\u1eef li\u1ec7u: C\u00e1c chu\u1ed7i CRLF \u0111\u01b0\u1ee3c ch\u00e8n v\u00e0o c\u00f3 th\u1ec3 thao t\u00fang lu\u1ed3ng d\u1eef li\u1ec7u trong \u1ee9ng d\u1ee5ng, d\u1eabn \u0111\u1ebfn c\u00e1c l\u1ed7 h\u1ed5ng ti\u1ec1m \u1ea9n.<\/p>\n<\/li>\n<li>\n<p>Ph\u1ea1m vi \u1ea3nh h\u01b0\u1edfng: L\u1ed7 h\u1ed5ng n\u00e0y kh\u00f4ng ch\u1ec9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u1ee9ng d\u1ee5ng x\u1ea3y ra vi\u1ec7c ti\u00eam m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng n\u00e0o kh\u00e1c x\u1eed l\u00fd c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u \u1edf ph\u00eda d\u01b0\u1edbi.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i ti\u00eam CRLF<\/h2>\n<p>C\u00f3 hai lo\u1ea1i ti\u00eam CRLF ch\u00ednh:<\/p>\n<ol>\n<li>\n<p><strong>T\u00e1ch ph\u1ea3n h\u1ed3i HTTP<\/strong>: \u0110\u00e2y l\u00e0 lo\u1ea1i ph\u1ed5 bi\u1ebfn nh\u1ea5t, trong \u0111\u00f3 c\u00e1c chu\u1ed7i CRLF \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o c\u00e1c ti\u00eau \u0111\u1ec1 HTTP \u0111\u1ec3 thao t\u00e1c ho\u1eb7c ph\u00e2n chia ph\u1ea3n h\u1ed3i HTTP.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u0103ng nh\u1eadp<\/strong>: Trong lo\u1ea1i n\u00e0y, vi\u1ec7c ch\u00e8n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u00e0nh c\u00e1c t\u1ec7p nh\u1eadt k\u00fd. K\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 khai th\u00e1c \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch gi\u1ea3 m\u1ea1o c\u00e1c m\u1ee5c nh\u1eadt k\u00fd ho\u1eb7c ch\u00e8n n\u1ed9i dung \u0111\u1ed9c h\u1ea1i.<\/p>\n<\/li>\n<\/ol>\n<h2>\u1ee8ng d\u1ee5ng, v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p cho vi\u1ec7c ti\u00eam CRLF<\/h2>\n<p>Vi\u1ec7c ti\u00eam CRLF c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi m\u1ee5c \u0111\u00edch x\u1ea5u theo nhi\u1ec1u c\u00e1ch, bao g\u1ed3m chi\u1ebfm quy\u1ec1n \u0111i\u1ec1u khi\u1ec3n phi\u00ean c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, \u0111\u00e1nh c\u1eafp d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng v\u00e0 l\u1eeba ng\u01b0\u1eddi d\u00f9ng th\u1ef1c thi c\u00e1c t\u1eadp l\u1ec7nh \u0111\u1ed9c h\u1ea1i.<\/p>\n<p>Ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam CRLF li\u00ean quan \u0111\u1ebfn vi\u1ec7c x\u00e1c th\u1ef1c v\u00e0 v\u1ec7 sinh \u0111\u1ea7u v\u00e0o. B\u1eb1ng c\u00e1ch gi\u1edbi h\u1ea1n c\u00e1c lo\u1ea1i k\u00fd t\u1ef1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn trong tr\u01b0\u1eddng nh\u1eadp c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 ki\u1ec3m tra ti\u00eau \u0111\u1ec1 HTTP \u0111\u1ec3 t\u00ecm c\u00e1c chu\u1ed7i CRLF kh\u00f4ng mong mu\u1ed1n, b\u1ea1n c\u00f3 th\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c ti\u00eam CRLF ti\u1ec1m \u1ea9n.<\/p>\n<h2>So s\u00e1nh v\u1edbi c\u00e1c \u0111i\u1ec1u kho\u1ea3n t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>Trong khi CRLF Ti\u00eam ch\u1ee7 y\u1ebfu x\u1eed l\u00fd c\u00e1c chu\u1ed7i CRLF x\u00e2m nh\u1eadp, c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam nhi\u1ec5m c\u00f3 li\u00ean quan kh\u00e1c bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Ti\u00eam SQL<\/strong>: \u0110i\u1ec1u n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c ti\u00eam m\u00e3 SQL \u0111\u1ed9c h\u1ea1i v\u00e0o \u1ee9ng d\u1ee5ng, c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn \u0111\u1ebfn truy c\u1eadp tr\u00e1i ph\u00e9p, h\u1ecfng d\u1eef li\u1ec7u ho\u1eb7c \u0111\u00e1nh c\u1eafp d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1eadp l\u1ec7nh ch\u00e9o trang (XSS)<\/strong>: Ki\u1ec3u t\u1ea5n c\u00f4ng n\u00e0y \u0111\u01b0a c\u00e1c t\u1eadp l\u1ec7nh \u0111\u1ed9c h\u1ea1i v\u00e0o c\u00e1c trang web \u0111\u00e1ng tin c\u1eady, sau \u0111\u00f3 \u0111\u01b0\u1ee3c tr\u00ecnh duy\u1ec7t c\u1ee7a n\u1ea1n nh\u00e2n th\u1ef1c thi.<\/p>\n<\/li>\n<li>\n<p><strong>L\u1ec7nh ti\u00eam<\/strong>: \u0110\u00e2y l\u00e0 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c t\u1ea5n c\u00f4ng trong \u0111\u00f3 k\u1ebb t\u1ea5n c\u00f4ng thay \u0111\u1ed5i d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o th\u00ec l\u00e0 c\u1ee7a \u1ee9ng d\u1ee5ng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c vi\u1ec7c th\u1ef1c thi l\u1ec7nh t\u00f9y \u00fd.<\/p>\n<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>Ti\u00eam CRLF<\/th>\n<th>Ti\u00eam SQL<\/th>\n<th>T\u1eadp l\u1ec7nh ch\u00e9o trang<\/th>\n<th>L\u1ec7nh ti\u00eam<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u1ee5c ti\u00eau ch\u00ednh<\/td>\n<td>Ti\u00eau \u0111\u1ec1 HTTP v\u00e0 \u0111\u1ea7u v\u00e0o c\u1ee7a ng\u01b0\u1eddi d\u00f9ng<\/td>\n<td>Truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/td>\n<td>T\u1eadp l\u1ec7nh ph\u00eda m\u00e1y kh\u00e1ch c\u1ee7a trang web<\/td>\n<td>Shell l\u1ec7nh m\u00e1y ch\u1ee7 c\u1ee7a \u1ee9ng d\u1ee5ng<\/td>\n<\/tr>\n<tr>\n<td>Ph\u00f2ng ng\u1eeba<\/td>\n<td>X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o v\u00e0 v\u1ec7 sinh<\/td>\n<td>S\u1eed d\u1ee5ng c\u00e1c c\u00e2u l\u1ec7nh \u0111\u00e3 chu\u1ea9n b\u1ecb s\u1eb5n ho\u1eb7c c\u00e1c truy v\u1ea5n \u0111\u01b0\u1ee3c tham s\u1ed1 h\u00f3a<\/td>\n<td>X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o, m\u00e3 h\u00f3a \u0111\u1ea7u ra, cookie ch\u1ec9 HTTP<\/td>\n<td>X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o, s\u1eed d\u1ee5ng API an to\u00e0n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng lai<\/h2>\n<p>Trong t\u01b0\u01a1ng lai, s\u1ef1 ph\u1ee5 thu\u1ed9c ng\u00e0y c\u00e0ng t\u0103ng v\u00e0o c\u00e1c c\u00f4ng c\u1ee5 b\u1ea3o m\u1eadt t\u1ef1 \u0111\u1ed9ng v\u00e0 h\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n l\u1ed7 h\u1ed5ng d\u1ef1a tr\u00ean AI s\u1ebd c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n v\u00e0 ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam CRLF. Ngo\u00e0i ra, c\u00e1c bi\u1ec7n ph\u00e1p th\u1ef1c h\u00e0nh m\u00e3 h\u00f3a an to\u00e0n v\u00e0 gi\u00e1o d\u1ee5c v\u1ec1 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam nhi\u1ec5m d\u1ef1 ki\u1ebfn s\u1ebd tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n trong c\u1ed9ng \u0111\u1ed3ng ph\u00e1t tri\u1ec3n, gi\u00fap gi\u1ea3m thi\u1ec3u h\u01a1n n\u1eefa r\u1ee7i ro n\u00e0y.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 ti\u00eam CRLF<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng Ti\u00eam CRLF. B\u1eb1ng c\u00e1ch xem x\u00e9t k\u1ef9 l\u01b0\u1ee1ng d\u1eef li\u1ec7u \u0111\u1ebfn v\u00e0 \u0111i \u0111\u1ec3 t\u00ecm c\u00e1c m\u1eabu \u0111\u00e1ng ng\u1edd, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c n\u1ed7 l\u1ef1c ti\u00eam ch\u00edch ti\u1ec1m \u1ea9n. M\u00e1y ch\u1ee7 proxy n\u00e2ng cao c\u0169ng c\u00f3 th\u1ec3 v\u1ec7 sinh d\u1eef li\u1ec7u tr\u01b0\u1edbc khi chuy\u1ec3n ti\u1ebfp \u0111\u1ebfn m\u00e1y ch\u1ee7 m\u1ee5c ti\u00eau, b\u1ed5 sung th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin chi ti\u1ebft v\u1ec1 CRLF Ti\u00eam, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/owasp.org\/www-community\/attacks\/CRLF_Injection\" target=\"_new\" rel=\"noopener nofollow\">Ti\u00eam CRLF OWASP<\/a><\/li>\n<li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Security\/Securing_your_site\/Http_splitting\" target=\"_new\" rel=\"noopener nofollow\">T\u00e0i li\u1ec7u web MDN: Chia t\u00e1ch ph\u1ea3n h\u1ed3i HTTP<\/a><\/li>\n<li><a href=\"https:\/\/www.acunetix.com\/websitesecurity\/crlf-injection\/\" target=\"_new\" rel=\"noopener nofollow\">H\u01b0\u1edbng d\u1eabn b\u1ea3o m\u1eadt \u1ee9ng d\u1ee5ng web: Ch\u00e8n CRLF<\/a><\/li>\n<li><a href=\"https:\/\/cwe.mitre.org\/data\/definitions\/93.html\" target=\"_new\" rel=\"noopener nofollow\">CWE \u2013 CWE-93: Trung h\u00f2a kh\u00f4ng \u0111\u00fang c\u00e1ch c\u00e1c chu\u1ed7i CRLF<\/a><\/li>\n<\/ul>","protected":false},"featured_media":476475,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476474","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Understanding CRLF Injection<\/mark>","faq_items":[{"question":"What is a CRLF Injection?","answer":"<p>A CRLF Injection is a type of security vulnerability where an attacker infiltrates Carriage Return Line Feed (CRLF) sequences into a web application. This infiltration primarily affects HTTP headers and can lead to various threats such as HTTP Response Splitting and Cross-Site Scripting.<\/p>"},{"question":"When was CRLF Injection first discovered?","answer":"<p>The term 'CRLF Injection' originated from the early days of the internet, as old as the HTTP protocol itself. Its misuse, or \"injection,\" started being recognized as a threat to web application security in the late 1990s and early 2000s.<\/p>"},{"question":"How does a CRLF Injection work?","answer":"<p>A CRLF Injection works by inserting CRLF sequences into an application's expected data stream. By doing this, the attacker can manipulate the system into recognizing these injections as legitimate commands or directives. This can lead to manipulated data flow and potential security vulnerabilities.<\/p>"},{"question":"What are the types of CRLF Injection?","answer":"<p>The two main types of CRLF injections are HTTP Response Splitting, where CRLF sequences are injected into HTTP headers to manipulate the HTTP response, and Log Injection, where the injection is made into log files, potentially forging log entries or inserting malicious content.<\/p>"},{"question":"How can we prevent CRLF Injection attacks?","answer":"<p>CRLF injection attacks can be prevented by implementing input validation and sanitization. This involves limiting the types of characters that can be accepted in user input fields and inspecting HTTP headers for unexpected CRLF sequences.<\/p>"},{"question":"How does CRLF Injection compare with other similar attacks?","answer":"<p>CRLF Injection involves infiltrating CRLF sequences, primarily affecting HTTP headers and user inputs. SQL Injection involves the injection of malicious SQL code, targeting database queries. Cross-Site Scripting involves the injection of malicious scripts into trusted websites, affecting client-side scripts. Command Injection is where an attacker alters dill data inputs to an application to achieve arbitrary command execution, targeting the application's host command shell.<\/p>"},{"question":"How are proxy servers related to CRLF Injection?","answer":"<p>Proxy servers, like OneProxy, can help prevent CRLF Injection attacks. They scrutinize incoming and outgoing data for suspicious patterns, identifying potential injection attempts. Some advanced proxy servers can also sanitize the data before forwarding it to the target server, adding an extra layer of security.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476474","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\/476474\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/476475"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}