{"id":103950,"date":"2022-05-04T15:37:02","date_gmt":"2022-05-04T13:37:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns"},"modified":"2022-05-04T15:37:02","modified_gmt":"2022-05-04T13:37:03","slug":"uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","title":{"rendered":"Hiba az uClibc \u00e9s uClibc-ng rendszerben, amely lehet\u0151v\u00e9 teszi a DNS cache adatok manipul\u00e1l\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A standard C k\u00f6nyvt\u00e1rakban, mint az uClibc \u00e9s uClibc-ng, amelyek sok be\u00e1gyazott \u00e9s hordozhat\u00f3 eszk\u00f6zben megtal\u00e1lhat\u00f3k, egy hiba (CVE nem lett hozz\u00e1rendelve) ker\u00fclt felfedez\u00e9sre, amely lehet\u0151v\u00e9 teszi hamis adatok beilleszt\u00e9s\u00e9t a DNS cache-be, amit arra lehet haszn\u00e1lni, hogy egy tetsz\u0151leges domain IP c\u00edm\u00e9t megv\u00e1ltoztassuk, \u00edgy a domainhez int\u00e9zett k\u00e9r\u00e9seket a t\u00e1mad\u00f3 szerver\u00e9re ir\u00e1ny\u00edthatjuk. <\/p>\n

A probl\u00e9ma k\u00fcl\u00f6nb\u00f6z\u0151 Linux firmware-eket \u00e9rint a routerek, hozz\u00e1f\u00e9r\u00e9si pontok \u00e9s IoT eszk\u00f6z\u00f6k sz\u00e1m\u00e1ra, valamint olyan Linux disztrib\u00faci\u00f3kat az be\u00e1gyazott rendszerekhez, mint az OpenWRT \u00e9s az Embedded Gentoo. Jelentett\u00e9k, hogy a hiba sz\u00e1mos gy\u00e1rt\u00f3 eszk\u00f6zeiben megjelenik (p\u00e9ld\u00e1ul az uClibc-t a Linksys, Netgear \u00e9s Axis firmware-jeiben haszn\u00e1lj\u00e1k), de mivel a uClibc \u00e9s uClibc-ng hib\u00e1i m\u00e9g nem lettek jav\u00edtva, a konkr\u00e9t eszk\u00f6z\u00f6kr\u0151l \u00e9s gy\u00e1rt\u00f3kr\u00f3l, amelyekben a probl\u00e9ma megtal\u00e1lhat\u00f3, r\u00e9szletes inform\u00e1ci\u00f3k m\u00e9g nem ker\u00fcltek nyilv\u00e1noss\u00e1gra. <\/p>\n

A hiba a DNS-k\u00e9r\u00e9sek k\u00fcld\u00e9s\u00e9ben haszn\u00e1lt el\u0151re megj\u00f3solhat\u00f3 tranzakci\u00f3s azonos\u00edt\u00f3k alkalmaz\u00e1s\u00e1b\u00f3l ered. A DNS k\u00e9r\u00e9s azonos\u00edt\u00f3ja egyszer\u0171 sz\u00e1ml\u00e1l\u00f3 n\u00f6vel\u00e9s\u00e9vel lett kiv\u00e1lasztva, an\u00e9lk\u00fcl hogy tov\u00e1bbi port randomiz\u00e1l\u00e1sra ker\u00fclt volna sor, ami lehet\u0151v\u00e9 tette a DNS cache megs\u00e9rt\u00e9s\u00e9t v\u00e1rakoztatott UDP csomagok k\u00fcld\u00e9s\u00e9vel hamis v\u00e1laszokkal (a v\u00e1lasz elfogad\u00e1sra ker\u00fcl, ha az kor\u00e1bban \u00e9rkezik, mint a val\u00f3di v\u00e1lasz \u00e9s tartalmazza a megfelel\u0151 ID-t). a szerver<\/a> Ezzel szemben a 2008-ban javasolt Kaminsky-m\u00f3dszerrel, a tranzakci\u00f3 azonos\u00edt\u00f3j\u00e1t m\u00e9g csak nem is kell kital\u00e1lni, mivel az alapvet\u0151en el\u0151re megj\u00f3solhat\u00f3 (eleinte az \u00e9rt\u00e9k 1-re van be\u00e1ll\u00edtva, amely minden k\u00e9r\u00e9s ut\u00e1n n\u00f6vekszik, nem pedig v\u00e9letlenszer\u0171en van kiv\u00e1lasztva).

\"Hiba<\/center> <\/p>\n

A kiv\u00e9dekez\u00e9s \u00e9rdek\u00e9ben aj\u00e1nlott tov\u00e1bbi v\u00e9letlenszer\u0171 eloszl\u00e1st alkalmazni azon h\u00e1l\u00f3zati portok sz\u00e1m\u00e1n\u00e1l, ahonnan DNS-k\u00e9r\u00e9seket k\u00fcldenek, ami kompenz\u00e1lja az azonos\u00edt\u00f3 el\u00e9gtelen m\u00e9ret\u00e9t. A portok v\u00e9letlenszer\u0171s\u00edt\u00e9s\u00e9nek enged\u00e9lyez\u00e9s\u00e9vel a hamis v\u00e1lasz gener\u00e1l\u00e1sa sor\u00e1n nemcsak a 16 bites azonos\u00edt\u00f3t kell kital\u00e1lni, hanem a h\u00e1l\u00f3zati port sz\u00e1m\u00e1t is. Az uClibc \u00e9s uClibc-ng eset\u00e9ben az ilyen v\u00e9letlenszer\u0171s\u00edt\u00e9st nem \u00e1ll\u00edtott\u00e1k be kifejezetten (a bind h\u00edv\u00e1sakor nem volt megadva v\u00e9letlenszer\u0171 kimeneti UDP port), \u00e9s alkalmaz\u00e1sa az oper\u00e1ci\u00f3s rendszer be\u00e1ll\u00edt\u00e1sait\u00f3l f\u00fcgg\u00f6tt. <\/p>\n

A v\u00e9letlens\u00e9g elt\u00e1vol\u00edt\u00e1sa mellett a k\u00e9r\u00e9si azonos\u00edt\u00f3 inkrement\u00e1l\u00e1sa mint egy trivi\u00e1lis feladat van megjel\u00f6lve. De m\u00e9g a v\u00e9letlens\u00e9g alkalmaz\u00e1sa eset\u00e9n is a t\u00e1mad\u00f3nak csup\u00e1n annyit kell tennie, hogy kital\u00e1lja a h\u00e1l\u00f3zati portot a 32768\u201360999 k\u00f6z\u00f6tti tartom\u00e1nyb\u00f3l, amihez t\u00f6meges, egyid\u0151ben t\u00f6rt\u00e9n\u0151 hamis v\u00e1laszok k\u00fcld\u00e9s\u00e9vel elt\u00e9r\u0151 h\u00e1l\u00f3zati portokhoz folyamodhat.

\"Hiba<\/center> <\/p>\n

The issue has been confirmed in all current releases of uClibc and uClibc-ng, including the latest versions uClibc 0.9.33.2 and uClibc-ng 1.0.40. In September 2021, information about the vulnerability was sent to CERT\/CC for coordinated preparation of fixes. In January 2022, data about the problem were passed to over 200 manufacturers collaborating with CERT\/CC. In March, there was an attempt to contact the maintainer of the uClibc-ng project separately, but he responded that he was unable to fix the vulnerability himself and recommended publicly disclosing information about the issue, hoping to receive help in developing a fix from the community. NETGEAR was the only manufacturer to announce the release of an update addressing the vulnerability.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 uClibc \u0438 uClibc-ng, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0438 \u043f\u043e\u0440\u0442\u0430\u0442\u0438\u0432\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u043a\u044d\u0448 DNS, \u0447\u0442\u043e \u043c\u043e\u0436\u043d\u043e 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\u0442\u043e\u0447\u0435\u043a \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430-\u0432\u0435\u0449\u0435\u0439, \u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103951,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103950","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerability in uClibc and uClibc-ng allowing data substitution in the DNS cache | ProHoster","description":"A vulnerability has been identified in the standard C 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