{"id":477869,"date":"2023-08-09T09:21:36","date_gmt":"2023-08-09T09:21:36","guid":{"rendered":""},"modified":"2023-09-05T11:15:35","modified_gmt":"2023-09-05T11:15:35","slug":"log4shell","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/log4shell\/","title":{"rendered":"Log4Shell"},"content":{"rendered":"<p>Log4Shell l\u00e0 m\u1ed9t l\u1ed7 h\u1ed5ng nghi\u00eam tr\u1ecdng xu\u1ea5t hi\u1ec7n v\u00e0o cu\u1ed1i n\u0103m 2021 v\u00e0 l\u00e0m rung chuy\u1ec3n b\u1ed1i c\u1ea3nh an ninh m\u1ea1ng. N\u00f3 khai th\u00e1c m\u1ed9t l\u1ed7 h\u1ed5ng trong th\u01b0 vi\u1ec7n ghi nh\u1eadt k\u00fd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i, Apache Log4j v\u00e0 cho ph\u00e9p k\u1ebb t\u1ea5n c\u00f4ng th\u1ef1c thi m\u00e3 t\u1eeb xa tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng. M\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng c\u1ee7a l\u1ed7 h\u1ed5ng n\u00e0y \u0111\u00e3 mang l\u1ea1i cho n\u00f3 x\u1ebfp h\u1ea1ng CVSS (H\u1ec7 th\u1ed1ng ch\u1ea5m \u0111i\u1ec3m l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt ph\u1ed5 bi\u1ebfn) \u201c10,0\u201d, \u0111i\u1ec3m cao nh\u1ea5t c\u00f3 th\u1ec3, cho th\u1ea5y kh\u1ea3 n\u0103ng g\u00e2y ra thi\u1ec7t h\u1ea1i tr\u00ean di\u1ec7n r\u1ed9ng v\u00e0 t\u00e0n kh\u1ed1c.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a Log4Shell v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3.<\/h2>\n<p>Ngu\u1ed3n g\u1ed1c c\u1ee7a Log4Shell b\u1eaft ngu\u1ed3n t\u1eeb vi\u1ec7c t\u1ea1o ra Apache Log4j, m\u1ed9t khung ghi nh\u1eadt k\u00fd ngu\u1ed3n m\u1edf ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng d\u1ef1a tr\u00ean Java kh\u00e1c nhau. V\u00e0o cu\u1ed1i n\u0103m 2021, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u b\u1ea3o m\u1eadt \u0111\u00e3 ph\u00e1t hi\u1ec7n ra m\u1ed9t l\u1ed7 h\u1ed5ng nghi\u00eam tr\u1ecdng trong Log4j, cho ph\u00e9p k\u1ebb t\u1ea5n c\u00f4ng ti\u00eam m\u00e3 \u0111\u1ed9c v\u00e0o h\u1ec7 th\u1ed1ng th\u00f4ng qua c\u01a1 ch\u1ebf ghi nh\u1eadt k\u00fd. L\u1ea7n \u0111\u1ea7u ti\u00ean c\u00f4ng ch\u00fang \u0111\u1ec1 c\u1eadp \u0111\u1ebfn Log4Shell x\u1ea3y ra khi Trung t\u00e2m \u0110i\u1ec1u ph\u1ed1i CERT t\u1ea1i \u0110\u1ea1i h\u1ecdc Carnegie Mellon c\u00f4ng b\u1ed1 ghi ch\u00fa v\u1ec1 l\u1ed7 h\u1ed5ng (CVE-2021-44228) v\u00e0o ng\u00e0y 9 th\u00e1ng 12 n\u0103m 2021.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Log4Shell. M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Log4Shell.<\/h2>\n<p>T\u00e1c \u0111\u1ed9ng c\u1ee7a Log4Shell v\u01b0\u1ee3t xa ch\u1ec9 Apache Log4j, v\u00ec nhi\u1ec1u \u1ee9ng d\u1ee5ng v\u00e0 s\u1ea3n ph\u1ea9m \u0111\u00e3 t\u00edch h\u1ee3p th\u01b0 vi\u1ec7n n\u00e0y, khi\u1ebfn ch\u00fang d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng. L\u1ed7 h\u1ed5ng n\u1eb1m \u1edf c\u00e1ch Log4j x\u1eed l\u00fd c\u00e1c th\u00f4ng \u0111i\u1ec7p t\u01b0\u1eddng tr\u00ecnh bao g\u1ed3m d\u1eef li\u1ec7u do ng\u01b0\u1eddi d\u00f9ng cung c\u1ea5p, \u0111\u1eb7c bi\u1ec7t khi s\u1eed d\u1ee5ng t\u00ednh n\u0103ng \u201ctra c\u1ee9u\u201d \u0111\u1ec3 tham chi\u1ebfu c\u00e1c bi\u1ebfn m\u00f4i tr\u01b0\u1eddng.<\/p>\n<p>Khi m\u1ed9t t\u00e1c nh\u00e2n \u0111\u1ed9c h\u1ea1i t\u1ea1o ra m\u1ed9t th\u00f4ng \u0111i\u1ec7p t\u01b0\u1eddng tr\u00ecnh \u0111\u01b0\u1ee3c t\u1ea1o ra \u0111\u1eb7c bi\u1ec7t b\u1eb1ng c\u00e1ch tra c\u1ee9u b\u1ecb thao t\u00fang, n\u00f3 s\u1ebd k\u00edch ho\u1ea1t vi\u1ec7c th\u1ef1c thi m\u00e3 t\u1eeb xa. \u0110i\u1ec1u n\u00e0y g\u00e2y ra m\u1ed1i \u0111e d\u1ecda \u0111\u00e1ng k\u1ec3 v\u00ec k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 khai th\u00e1c Log4Shell \u0111\u1ec3 truy c\u1eadp tr\u00e1i ph\u00e9p, \u0111\u00e1nh c\u1eafp d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m, l\u00e0m gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5 v\u00e0 th\u1eadm ch\u00ed chi\u1ebfm to\u00e0n quy\u1ec1n ki\u1ec3m so\u00e1t c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c nh\u1eafm m\u1ee5c ti\u00eau.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Log4Shell. C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Log4Shell.<\/h2>\n<p>Log4Shell khai th\u00e1c c\u01a1 ch\u1ebf \u201ctra c\u1ee9u\u201d Log4j b\u1eb1ng c\u00e1ch ch\u1ec9 \u0111\u1ecbnh \u1ee9ng d\u1ee5ng d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng l\u00e0m ngu\u1ed3n tra c\u1ee9u cho c\u00e1c bi\u1ebfn m\u00f4i tr\u01b0\u1eddng. Khi \u1ee9ng d\u1ee5ng nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o nh\u1eadt k\u00fd \u0111\u1ed9c h\u1ea1i, n\u00f3 s\u1ebd ph\u00e2n t\u00edch c\u00fa ph\u00e1p v\u00e0 c\u1ed1 g\u1eafng gi\u1ea3i quy\u1ebft c\u00e1c bi\u1ebfn m\u00f4i tr\u01b0\u1eddng \u0111\u01b0\u1ee3c tham chi\u1ebfu, v\u00f4 t\u00ecnh th\u1ef1c thi m\u00e3 c\u1ee7a k\u1ebb t\u1ea5n c\u00f4ng.<\/p>\n<p>\u0110\u1ec3 h\u00ecnh dung qu\u00e1 tr\u00ecnh c\u1ee7a Log4Shell, h\u00e3y xem x\u00e9t tr\u00ecnh t\u1ef1 sau:<\/p>\n<ol>\n<li>K\u1ebb t\u1ea5n c\u00f4ng t\u1ea1o ra m\u1ed9t th\u00f4ng \u0111i\u1ec7p t\u01b0\u1eddng tr\u00ecnh \u0111\u1ed9c h\u1ea1i c\u00f3 ch\u1ee9a c\u00e1c tra c\u1ee9u b\u1ecb thao t\u00fang.<\/li>\n<li>\u1ee8ng d\u1ee5ng d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng s\u1ebd ghi l\u1ea1i th\u00f4ng b\u00e1o b\u1eb1ng Log4j, k\u00edch ho\u1ea1t c\u01a1 ch\u1ebf tra c\u1ee9u.<\/li>\n<li>Log4j c\u1ed1 g\u1eafng gi\u1ea3i quy\u1ebft vi\u1ec7c tra c\u1ee9u, th\u1ef1c thi m\u00e3 c\u1ee7a k\u1ebb t\u1ea5n c\u00f4ng.<\/li>\n<li>Vi\u1ec7c th\u1ef1c thi m\u00e3 t\u1eeb xa x\u1ea3y ra, c\u1ea5p cho k\u1ebb t\u1ea5n c\u00f4ng quy\u1ec1n truy c\u1eadp tr\u00e1i ph\u00e9p.<\/li>\n<\/ol>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Log4Shell.<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Log4Shell khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ed7 h\u1ed5ng c\u1ef1c k\u1ef3 nguy hi\u1ec3m bao g\u1ed3m:<\/p>\n<ol>\n<li><strong>\u0110i\u1ec3m CVSS cao<\/strong>: Log4Shell \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec3m CVSS l\u00e0 10,0, n\u00eau b\u1eadt m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng v\u00e0 kh\u1ea3 n\u0103ng g\u00e2y s\u00e1t th\u01b0\u01a1ng tr\u00ean di\u1ec7n r\u1ed9ng c\u1ee7a n\u00f3.<\/li>\n<li><strong>T\u00e1c \u0111\u1ed9ng r\u1ed9ng r\u00e3i<\/strong>: Do s\u1ef1 ph\u1ed5 bi\u1ebfn c\u1ee7a Apache Log4j, h\u00e0ng tri\u1ec7u h\u1ec7 th\u1ed1ng tr\u00ean to\u00e0n c\u1ea7u tr\u1edf n\u00ean d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng, bao g\u1ed3m m\u00e1y ch\u1ee7 web, \u1ee9ng d\u1ee5ng doanh nghi\u1ec7p, d\u1ecbch v\u1ee5 \u0111\u00e1m m\u00e2y, v.v.<\/li>\n<li><strong>Khai th\u00e1c nhanh<\/strong>: T\u1ed9i ph\u1ea1m m\u1ea1ng nhanh ch\u00f3ng th\u00edch nghi \u0111\u1ec3 khai th\u00e1c l\u1ed7 h\u1ed5ng, khi\u1ebfn c\u00e1c t\u1ed5 ch\u1ee9c ph\u1ea3i kh\u1ea9n c\u1ea5p v\u00e1 h\u1ec7 th\u1ed1ng c\u1ee7a m\u00ecnh k\u1ecbp th\u1eddi.<\/li>\n<li><strong>\u0110a n\u1ec1n t\u1ea3ng<\/strong>: Log4j l\u00e0 l\u1ed7 h\u1ed5ng \u0111a n\u1ec1n t\u1ea3ng, ngh\u0129a l\u00e0 l\u1ed7 h\u1ed5ng n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nhi\u1ec1u h\u1ec7 \u0111i\u1ec1u h\u00e0nh kh\u00e1c nhau, bao g\u1ed3m Windows, Linux v\u00e0 macOS.<\/li>\n<li><strong>V\u00e1 b\u1ecb tr\u00ec ho\u00e3n<\/strong>: M\u1ed9t s\u1ed1 t\u1ed5 ch\u1ee9c ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi nh\u1eefng th\u00e1ch th\u1ee9c trong vi\u1ec7c \u00e1p d\u1ee5ng k\u1ecbp th\u1eddi c\u00e1c b\u1ea3n v\u00e1, khi\u1ebfn h\u1ec7 th\u1ed1ng c\u1ee7a h\u1ecd b\u1ecb l\u1ed9 trong m\u1ed9t th\u1eddi gian d\u00e0i.<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i Log4Shell<\/h2>\n<p>Log4Shell c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean lo\u1ea1i \u1ee9ng d\u1ee5ng v\u00e0 h\u1ec7 th\u1ed1ng m\u00e0 n\u00f3 t\u00e1c \u0111\u1ed9ng. C\u00e1c lo\u1ea1i ch\u00ednh bao g\u1ed3m:<\/p>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u00e1y ch\u1ee7 web<\/td>\n<td>C\u00e1c m\u00e1y ch\u1ee7 web d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng tr\u00ean Internet, cho ph\u00e9p th\u1ef1c thi m\u00e3 t\u1eeb xa.<\/td>\n<\/tr>\n<tr>\n<td>\u1ee8ng d\u1ee5ng doanh nghi\u1ec7p<\/td>\n<td>C\u00e1c \u1ee9ng d\u1ee5ng doanh nghi\u1ec7p d\u1ef1a tr\u00ean Java s\u1eed d\u1ee5ng Log4j v\u00e0 d\u1ec5 b\u1ecb khai th\u00e1c.<\/td>\n<\/tr>\n<tr>\n<td>D\u1ecbch v\u1ee5 \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y<\/td>\n<td>N\u1ec1n t\u1ea3ng \u0111\u00e1m m\u00e2y ch\u1ea1y \u1ee9ng d\u1ee5ng Java v\u1edbi Log4j khi\u1ebfn ch\u00fang g\u1eb7p r\u1ee7i ro.<\/td>\n<\/tr>\n<tr>\n<td>Thi\u1ebft b\u1ecb IoT<\/td>\n<td>C\u00e1c thi\u1ebft b\u1ecb Internet of Things (IoT) s\u1eed d\u1ee5ng Log4j, c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn \u0111\u1ebfn c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng t\u1eeb xa.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng Log4Shell, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng.<\/h2>\n<p><strong>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng Log4Shell:<\/strong><\/p>\n<ul>\n<li>Khai th\u00e1c c\u00e1c m\u00e1y ch\u1ee7 web b\u1ecb l\u1ed9 \u0111\u1ec3 x\u00e2m ph\u1ea1m d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m ho\u1eb7c c\u00e0i \u0111\u1eb7t ph\u1ea7n m\u1ec1m \u0111\u1ed9c h\u1ea1i.<\/li>\n<li>X\u00e2m ph\u1ea1m m\u1ea1ng c\u00f4ng ty th\u00f4ng qua c\u00e1c \u1ee9ng d\u1ee5ng doanh nghi\u1ec7p d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng.<\/li>\n<li>Ph\u00e1t \u0111\u1ed9ng c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng DDoS b\u1eb1ng c\u00e1ch chi\u1ebfm quy\u1ec1n ki\u1ec3m so\u00e1t c\u00e1c d\u1ecbch v\u1ee5 \u0111\u00e1m m\u00e2y.<\/li>\n<li>Khai th\u00e1c c\u00e1c thi\u1ebft b\u1ecb IoT \u0111\u1ec3 t\u1ea1o botnet cho c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u1edbn h\u01a1n.<\/li>\n<\/ul>\n<p><strong>V\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p:<\/strong><\/p>\n<ul>\n<li>Tr\u00ec ho\u00e3n vi\u1ec7c v\u00e1 l\u1ed7i: M\u1ed9t s\u1ed1 t\u1ed5 ch\u1ee9c g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c b\u1ea3n v\u00e1 k\u1ecbp th\u1eddi do c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng ph\u1ee9c t\u1ea1p v\u00e0 s\u1ef1 ph\u1ee5 thu\u1ed9c. Gi\u1ea3i ph\u00e1p l\u00e0 \u01b0u ti\u00ean qu\u1ea3n l\u00fd b\u1ea3n v\u00e1 v\u00e0 t\u1ef1 \u0111\u1ed9ng c\u1eadp nh\u1eadt n\u1ebfu c\u00f3 th\u1ec3.<\/li>\n<li>Nh\u1eadn th\u1ee9c ch\u01b0a \u0111\u1ea7y \u0111\u1ee7: Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c t\u1ed5 ch\u1ee9c \u0111\u1ec1u nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o Log4j c\u1ee7a h\u1ecd. Ki\u1ec3m to\u00e1n th\u01b0\u1eddng xuy\u00ean v\u00e0 \u0111\u00e1nh gi\u00e1 b\u1ea3o m\u1eadt c\u00f3 th\u1ec3 gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c h\u1ec7 th\u1ed1ng d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng.<\/li>\n<li>\u1ee8ng d\u1ee5ng c\u0169: C\u00e1c \u1ee9ng d\u1ee5ng c\u0169 h\u01a1n c\u00f3 th\u1ec3 c\u00f3 ph\u1ea7n ph\u1ee5 thu\u1ed9c l\u1ed7i th\u1eddi. C\u00e1c t\u1ed5 ch\u1ee9c n\u00ean xem x\u00e9t n\u00e2ng c\u1ea5p l\u00ean phi\u00ean b\u1ea3n m\u1edbi h\u01a1n ho\u1eb7c \u00e1p d\u1ee5ng c\u00e1c gi\u1ea3i ph\u00e1p thay th\u1ebf cho \u0111\u1ebfn khi vi\u1ec7c v\u00e1 l\u1ed7i kh\u1ea3 thi.<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 c\u00e1c so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng v\u00e0 danh s\u00e1ch.<\/h2>\n<p><strong>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a Log4Shell:<\/strong><\/p>\n<ul>\n<li>Ph\u1ea7n m\u1ec1m d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng: C\u00e1c phi\u00ean b\u1ea3n Apache Log4j 2.x (t\u1ed1i \u0111a 2.15.0) b\u1ecb \u1ea3nh h\u01b0\u1edfng.<\/li>\n<li>\u0110i\u1ec3m CVSS: 10.0 (Quan tr\u1ecdng)<\/li>\n<li>Vector khai th\u00e1c: Remote<\/li>\n<li>\u0110\u1ed9 ph\u1ee9c t\u1ea1p t\u1ea5n c\u00f4ng: Th\u1ea5p<\/li>\n<li>Y\u00eau c\u1ea7u x\u00e1c th\u1ef1c: Kh\u00f4ng<\/li>\n<\/ul>\n<p><strong>So s\u00e1nh v\u1edbi c\u00e1c \u0111i\u1ec1u kho\u1ea3n t\u01b0\u01a1ng t\u1ef1:<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng<\/th>\n<th>\u0110i\u1ec3m CVSS<\/th>\n<th>Vector khai th\u00e1c<\/th>\n<th>\u0110\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a cu\u1ed9c t\u1ea5n c\u00f4ng<\/th>\n<th>Y\u00eau c\u1ea7u x\u00e1c th\u1ef1c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Log4Shell<\/td>\n<td>10.0<\/td>\n<td>Xa<\/td>\n<td>Th\u1ea5p<\/td>\n<td>KH\u00d4NG<\/td>\n<\/tr>\n<tr>\n<td>ch\u1ea3y m\u00e1u tim<\/td>\n<td>9.4<\/td>\n<td>Xa<\/td>\n<td>Th\u1ea5p<\/td>\n<td>KH\u00d4NG<\/td>\n<\/tr>\n<tr>\n<td>Shellshock<\/td>\n<td>10.0<\/td>\n<td>Xa<\/td>\n<td>Th\u1ea5p<\/td>\n<td>KH\u00d4NG<\/td>\n<\/tr>\n<tr>\n<td>b\u00f3ng ma<\/td>\n<td>5.6<\/td>\n<td>C\u1ee5c b\u1ed9\/T\u1eeb xa<\/td>\n<td>Th\u1ea5p<\/td>\n<td>KH\u00d4NG<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Log4Shell.<\/h2>\n<p>L\u1ed7 h\u1ed5ng Log4Shell \u0111\u00f3ng vai tr\u00f2 l\u00e0 l\u1eddi c\u1ea3nh t\u1ec9nh cho ng\u00e0nh \u01b0u ti\u00ean b\u1ea3o m\u1eadt v\u00e0 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a chu\u1ed7i cung \u1ee9ng ph\u1ea7n m\u1ec1m. Do \u0111\u00f3, m\u1ed9t s\u1ed1 quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 \u0111\u00e3 xu\u1ea5t hi\u1ec7n \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 t\u01b0\u01a1ng t\u1ef1 trong t\u01b0\u01a1ng lai:<\/p>\n<ol>\n<li><strong>Qu\u1ea3n l\u00fd b\u1ea3n v\u00e1 n\u00e2ng cao<\/strong>: C\u00e1c t\u1ed5 ch\u1ee9c \u0111ang \u00e1p d\u1ee5ng h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd b\u1ea3n v\u00e1 t\u1ef1 \u0111\u1ed9ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u1eadp nh\u1eadt k\u1ecbp th\u1eddi v\u00e0 ng\u0103n ch\u1eb7n c\u00e1c l\u1ed7 h\u1ed5ng nh\u01b0 Log4Shell.<\/li>\n<li><strong>Containerization v\u00e0 microservice<\/strong>: C\u00e1c c\u00f4ng ngh\u1ec7 v\u00f9ng ch\u1ee9a nh\u01b0 Docker v\u00e0 Kubernetes cho ph\u00e9p m\u00f4i tr\u01b0\u1eddng \u1ee9ng d\u1ee5ng b\u1ecb c\u00f4 l\u1eadp, h\u1ea1n ch\u1ebf t\u00e1c \u0111\u1ed9ng c\u1ee7a c\u00e1c l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt.<\/li>\n<li><strong>C\u00f4ng c\u1ee5 \u0111\u00e1nh gi\u00e1 v\u00e0 ki\u1ec3m tra b\u1ea3o m\u1eadt<\/strong>: C\u00e1c c\u00f4ng c\u1ee5 b\u1ea3o m\u1eadt n\u00e2ng cao \u0111ang tr\u1edf n\u00ean c\u1ea7n thi\u1ebft cho vi\u1ec7c ki\u1ec3m tra v\u00e0 \u0111\u00e1nh gi\u00e1 c\u00e1c ph\u1ea7n ph\u1ee5 thu\u1ed9c c\u1ee7a ph\u1ea7n m\u1ec1m nh\u1eb1m x\u00e1c \u0111\u1ecbnh c\u00e1c r\u1ee7i ro ti\u1ec1m \u1ea9n.<\/li>\n<li><strong>Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n th\u01b0 vi\u1ec7n nghi\u00eam ng\u1eb7t<\/strong>: C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n th\u1eadn tr\u1ecdng h\u01a1n v\u1ec1 s\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a th\u01b0 vi\u1ec7n, ch\u1ec9 ch\u1ecdn c\u00e1c phi\u00ean b\u1ea3n c\u1eadp nh\u1eadt v\u00e0 \u0111\u01b0\u1ee3c b\u1ea3o tr\u00ec t\u1ed1t.<\/li>\n<li><strong>Ch\u01b0\u01a1ng tr\u00ecnh ti\u1ec1n th\u01b0\u1edfng l\u1ed7i b\u1ea3o m\u1eadt<\/strong>: C\u00e1c t\u1ed5 ch\u1ee9c \u0111ang khuy\u1ebfn kh\u00edch c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u an ninh m\u1ea1ng t\u00ecm v\u00e0 b\u00e1o c\u00e1o c\u00e1c l\u1ed7 h\u1ed5ng m\u1ed9t c\u00e1ch c\u00f3 tr\u00e1ch nhi\u1ec7m, cho ph\u00e9p ph\u00e1t hi\u1ec7n s\u1edbm v\u00e0 gi\u1ea3m thi\u1ec3u.<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi Log4Shell.<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u0103ng c\u01b0\u1eddng an ninh m\u1ea1ng b\u1eb1ng c\u00e1ch \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 internet. M\u1eb7c d\u00f9 b\u1ea3n th\u00e2n c\u00e1c m\u00e1y ch\u1ee7 proxy kh\u00f4ng d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng tr\u1ef1c ti\u1ebfp b\u1edfi Log4Shell nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 gi\u00e1n ti\u1ebfp g\u00f3p ph\u1ea7n gi\u1ea3m thi\u1ec3u r\u1ee7i ro li\u00ean quan \u0111\u1ebfn l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt.<\/p>\n<p><strong>Vai tr\u00f2 c\u1ee7a m\u00e1y ch\u1ee7 proxy trong vi\u1ec7c gi\u1ea3m nh\u1eb9 Log4Shell:<\/strong><\/p>\n<ol>\n<li><strong>L\u1ecdc web<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 l\u1ecdc v\u00e0 ch\u1eb7n l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ed9c h\u1ea1i, ng\u0103n ch\u1eb7n k\u1ebb t\u1ea5n c\u00f4ng ti\u1ebfp c\u1eadn c\u00e1c m\u00e1y ch\u1ee7 web d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng.<\/li>\n<li><strong>Ki\u1ec3m tra n\u1ed9i dung<\/strong>: Proxy c\u00f3 th\u1ec3 ki\u1ec3m tra l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ebfn v\u00e0 \u0111i \u0111\u1ec3 t\u00ecm t\u1ea3i tr\u1ecdng \u0111\u1ed9c h\u1ea1i, t\u1ea1m d\u1eebng c\u00e1c n\u1ed7 l\u1ef1c khai th\u00e1c.<\/li>\n<li><strong>Ki\u1ec3m tra SSL<\/strong>: B\u1eb1ng c\u00e1ch gi\u1ea3i m\u00e3 v\u00e0 ki\u1ec3m tra l\u01b0u l\u01b0\u1ee3ng SSL\/TLS, proxy c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 ch\u1eb7n m\u00e3 \u0111\u1ed9c \u1ea9n trong c\u00e1c k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/li>\n<li><strong>B\u1ed9 nh\u1edb \u0111\u1ec7m v\u00e0 n\u00e9n<\/strong>: Proxy c\u00f3 th\u1ec3 l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00e1c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean, gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u \u0111i qua c\u00e1c \u1ee9ng d\u1ee5ng d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng.<\/li>\n<\/ol>\n<p>C\u00e1c nh\u00e0 cung c\u1ea5p m\u00e1y ch\u1ee7 proxy nh\u01b0 OneProxy c\u00f3 th\u1ec3 t\u00edch h\u1ee3p c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt d\u00e0nh ri\u00eang cho Log4Shell v\u00e0o d\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd, n\u00e2ng cao kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 t\u1ed5ng th\u1ec3 cho kh\u00e1ch h\u00e0ng tr\u01b0\u1edbc c\u00e1c l\u1ed7 h\u1ed5ng m\u1edbi n\u1ed5i.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 Log4Shell v\u00e0 c\u00e1ch b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n, vui l\u00f2ng tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/logging.apache.org\/log4j\/2.x\/\" target=\"_new\" rel=\"noopener nofollow\">Trang web ch\u00ednh th\u1ee9c c\u1ee7a Apache Log4j<\/a><\/li>\n<li><a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2021-44228\" target=\"_new\" rel=\"noopener nofollow\">C\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1ec1 l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt qu\u1ed1c gia c\u1ee7a NIST (NVD) \u2013 CVE-2021-44228<\/a><\/li>\n<li><a href=\"https:\/\/us-cert.cisa.gov\/ncas\/alerts\/aa21-339a\" target=\"_new\" rel=\"noopener nofollow\">CISA \u2013 C\u1ea3nh b\u00e1o (AA21-339A) \u2013 Th\u00f4ng tin x\u00e1c th\u1ef1c b\u1ecb \u0111\u00e1nh c\u1eafp b\u1ecb khu\u1ebfch \u0111\u1ea1i<\/a><\/li>\n<\/ol>\n<p>Lu\u00f4n c\u1eadp nh\u1eadt th\u00f4ng tin v\u00e0 b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n kh\u1ecfi c\u00e1c m\u1ed1i \u0111e d\u1ecda ti\u1ec1m \u1ea9n c\u1ee7a Log4Shell.<\/p>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477869","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Log4Shell: Unraveling the Complexities of a Critical Vulnerability<\/mark>","faq_items":[{"question":"What is Log4Shell?","answer":"<p>Log4Shell is a critical vulnerability that emerged in late 2021. It exploits a flaw in the widely used logging library, Apache Log4j, allowing attackers to execute remote code on vulnerable systems.<\/p>"},{"question":"How did Log4Shell originate?","answer":"<p>The vulnerability originated in the Apache Log4j logging framework. It was first publicly mentioned by the CERT Coordination Center at Carnegie Mellon University on December 9, 2021.<\/p>"},{"question":"How does Log4Shell work?","answer":"<p>Log4Shell manipulates the Log4j \"lookup\" feature, injecting malicious code into vulnerable systems through specially crafted log messages. When the application processes these logs, the attacker's code executes, granting unauthorized access.<\/p>"},{"question":"What are the key features of Log4Shell?","answer":"<p>Log4Shell's criticality is highlighted by its CVSS score of 10.0. It impacts millions of systems, including web servers, enterprise apps, and cloud services. Attackers can exploit it to gain control, steal data, and disrupt services.<\/p>"},{"question":"What types of Log4Shell exist?","answer":"<p>Log4Shell can impact web servers, enterprise apps, cloud services, and IoT devices.<\/p>"},{"question":"How can Log4Shell be used, and what are the solutions to related problems?","answer":"<p>Log4Shell can be used to compromise web servers, breach corporate networks, launch DDoS attacks, and create IoT botnets. Solutions include prioritizing patch management, conducting regular security audits, and upgrading legacy applications.<\/p>"},{"question":"What are the main characteristics of Log4Shell, and how does it compare to similar terms?","answer":"<p>Log4Shell is characterized by its high CVSS score, remote exploitation vector, low attack complexity, and no authentication required. It is more critical than terms like Heartbleed, Shellshock, and Spectre.<\/p>"},{"question":"What are the future perspectives and technologies related to Log4Shell?","answer":"<p>The industry emphasizes enhanced patch management, containerization, security auditing tools, library version control, and bug bounty programs to mitigate future vulnerabilities.<\/p>"},{"question":"How can proxy servers be associated with Log4Shell?","answer":"<p>Proxy servers indirectly contribute to Log4Shell mitigation by filtering malicious traffic, inspecting content, decrypting SSL traffic, caching resources, and compressing data.<\/p>"},{"question":"Where can I find more information about Log4Shell?","answer":"<p>For more information, visit the official Apache Log4j website, the NIST National Vulnerability Database (CVE-2021-44228), and CISA's Alert (AA21-339A) on Amplified Stolen Credentials. Stay informed and safeguard your systems against Log4Shell's threats.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477869","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\/477869\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477869"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}