{"id":112308,"date":"2023-12-19T03:10:22","date_gmt":"2023-12-19T01:10:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya"},"modified":"2023-12-19T03:10:22","modified_gmt":"2023-12-19T01:10:22","slug":"terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya","title":{"rendered":"Terrapin \u2014 egy SSH protokollt \u00e9rint\u0151 sebezhet\u0151s\u00e9g, amely cs\u00f6kkentheti a kapcsolat v\u00e9delm\u00e9t.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Ruhr University Bochum (Germany) research group has introduced a new MITM attack technique on SSH \u2014 Terrapin, exploiting a vulnerability (CVE-2023-48795) in the protocol. The attacker capable of organizing a MITM attack can block the sending of a message with protocol extension configurations during the connection negotiation to lower the connection's security level. A prototype toolkit for executing the attack has been published on GitHub. <\/p>\n

Az OpenSSH kontextus\u00e1ban a s\u00e9r\u00fcl\u00e9kenys\u00e9g p\u00e9ld\u00e1ul lehet\u0151v\u00e9 teszi a kapcsolat vissza\u00e1ll\u00edt\u00e1s\u00e1t kev\u00e9sb\u00e9 v\u00e9dett hiteles\u00edt\u00e9si algoritmusokra \u00e9s a k\u00e9sleltet\u00e9sek elemz\u00e9s\u00e9vel, a billenty\u0171zet lenyom\u00e1sainak vissza\u00e1ll\u00edt\u00e1s\u00e1val v\u00e9gzett t\u00e1mad\u00e1sok ellen\u00e1ll\u00e1s\u00e1nak kikapcsol\u00e1s\u00e1t. A Terrapin t\u00e1mad\u00e1s az AsyncSSH Python k\u00f6nyvt\u00e1r \u00e9s a bels\u0151 \u00e1llapotg\u00e9p (CVE-2023-46446) s\u00e9r\u00fcl\u00e9kenys\u00e9ge kombin\u00e1l\u00e1s\u00e1val lehet\u0151v\u00e9 teszi az SSH munkamenetbe val\u00f3 beavatkoz\u00e1st. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g minden SSH-implement\u00e1ci\u00f3t \u00e9rint, amely t\u00e1mogatja a ChaCha20-Poly1305 vagy CBC \u00fczemm\u00f3dban m\u0171k\u00f6d\u0151 titkos\u00edt\u00e1st az ETM (Encrypt-then-MAC) \u00fczemm\u00f3ddal egy\u00fctt. P\u00e9ld\u00e1ul hasonl\u00f3 lehet\u0151s\u00e9gek m\u00e1r t\u00f6bb mint 10 \u00e9ve el\u00e9rhet\u0151k az OpenSSH-ban. A s\u00e9r\u00fcl\u00e9kenys\u00e9get blokkolt\u00e1k az OpenSSH 9.6 mai kiad\u00e1s\u00e1ban, valamint a PuTTY 0.80, libssh 0.10.6\/0.9.8 \u00e9s az AsyncSSH 2.14.2 friss\u00edt\u00e9seiben. A Dropbear SSH eset\u00e9ben a jav\u00edt\u00e1st m\u00e1r hozz\u00e1adt\u00e1k a k\u00f3dhoz, de az \u00faj kiad\u00e1s m\u00e9g nem k\u00e9sz\u00fclt el. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g abb\u00f3l ad\u00f3dik, hogy a t\u00e1mad\u00f3, aki ir\u00e1ny\u00edtja a kapcsolat forgalm\u00e1t (p\u00e9ld\u00e1ul egy rosszindulat\u00fa vezet\u00e9k n\u00e9lk\u00fcli pont tulajdonosa), k\u00e9pes a csomagok sorrendi sz\u00e1mait korrig\u00e1lni a kapcsolat l\u00e9trehoz\u00e1sakor, \u00edgy \u00e9szrev\u00e9tlen\u00fcl el lehet t\u00e1vol\u00edtani tetsz\u0151leges sz\u00e1m\u00fa SSH-\u00fczemeltet\u00e9si \u00fczenetet, amelyet a kliens k\u00fcld\u00f6tt, vagy szerverrel<\/a>. Egyebek k\u00f6z\u00f6tt a t\u00e1mad\u00f3 elt\u00e1vol\u00edthatja az SSH_MSG_EXT_INFO \u00fczeneteket, amelyek a protokoll \u00e1ltal alkalmazott kiterjeszt\u00e9sek be\u00e1ll\u00edt\u00e1s\u00e1hoz sz\u00fcks\u00e9gesek. Annak \u00e9rdek\u00e9ben, hogy a m\u00e1sik f\u00e9l ne \u00e9szlelje a csomag hi\u00e1ny\u00e1t a sorrendi sz\u00e1mok k\u00f6z\u00f6tti hi\u00e1ny miatt, a t\u00e1mad\u00f3 hamis csomag k\u00fcld\u00e9s\u00e9vel ind\u00edtja el a sorrendi sz\u00e1m eltol\u00e1s\u00e1t, amely ugyanazt a sorrendi sz\u00e1mot hordozza, mint az elt\u00e1vol\u00edtott csomag. A hamis csomag SSH_MSG_IGNORE jelz\u00e9ssel ell\u00e1tott \u00fczenetet tartalmaz, amelyet figyelmen k\u00edv\u00fcl hagynak a feldolgoz\u00e1s sor\u00e1n.

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

A t\u00e1mad\u00e1s nem v\u00e9gezhet\u0151 el folyamatos titkos\u00edt\u00f3 algoritmusok \u00e9s CTR haszn\u00e1lata mellett, mivel a s\u00e9rtetlens\u00e9g beny\u00fajt\u00e1sa az alkalmaz\u00e1s szintj\u00e9n lesz \u00e9szlelve. A gyakorlatban csak a ChaCha20-Poly1305 (chacha20-poly1305@openssh.com) algoritmusokra lehet \u00e9rz\u00e9keny a t\u00e1mad\u00e1s, ahol az \u00e1llapotot csak az \u00fczenetek sorozatsz\u00e1mai alapj\u00e1n k\u00f6vetik nyomon, \u00e9s az Encrypt-Then-MAC (*-etm@openssh.com) \u00e9s CBC \u00fczemm\u00f3dok kombin\u00e1ci\u00f3ja. <\/p>\n

In OpenSSH 9.6 and other implementations, a protocol extension called 'strict KEX' has been implemented to block the attack, which automatically activates if supported on the other side. a szerver<\/a> A kieg\u00e9sz\u00edt\u0151 lez\u00e1rja a kapcsolatot b\u00e1rmely rendellenes vagy felesleges \u00fczenet (p\u00e9ld\u00e1ul SSH_MSG_IGNORE vagy SSH2_MSG_DEBUG z\u00e1szl\u00f3val) k\u00e9zhezv\u00e9telekor, amely a kapcsolat egyeztet\u00e9se sor\u00e1n \u00e9rkezik, valamint a MAC (\u00fczenet hiteles\u00edt\u00e9si k\u00f3d) sz\u00e1ml\u00e1l\u00f3t null\u00e1zza minden kulcscsere befejez\u00e9se ut\u00e1n.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0420\u0443\u0440\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0411\u043e\u0445\u0443\u043c\u0435 (\u0413\u0435\u0440\u043c\u0430\u043d\u0438\u044f) \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 MITM-\u0430\u0442\u0430\u043a\u0438 \u043d\u0430 SSH — Terrapin, \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u044e\u0449\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-48795) \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435. \u0410\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0439 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c MITM-\u0430\u0442\u0430\u043a\u0443, \u0438\u043c\u0435\u0435\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0441 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u043e\u0439 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 \u0434\u043b\u044f \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044f \u0443\u0440\u043e\u0432\u043d\u044f \u0437\u0430\u0449\u0438\u0442\u044b \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0434\u043b\u044f \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043d\u0430 GitHub. \u0412 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 OpenSSH \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":112309,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-112308","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\udd47Terrapin \u2014 s\u00e9r\u00fcl\u00e9kenys\u00e9g az SSH protokollban, amely cs\u00f6kkenti a kapcsolat v\u00e9delm\u00e9t | ProHoster","description":"A bochumi Ruhr Egyetem kutat\u00f3i bemutatt\u00e1k az SSH-ra ir\u00e1nyul\u00f3 \u00faj MITM-t\u00e1mad\u00e1st - Terrapin, kihaszn\u00e1lva a protokollban tal\u00e1lhat\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2023-48795).","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Terrapin \u2014 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 SSH, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u043d\u0438\u0437\u0438\u0442\u044c \u0437\u0430\u0449\u0438\u0442\u0443 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f | ProHoster","og:description":"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0420\u0443\u0440\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0411\u043e\u0445\u0443\u043c\u0435 (\u0413\u0435\u0440\u043c\u0430\u043d\u0438\u044f) \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 MITM-\u0430\u0442\u0430\u043a\u0438 \u043d\u0430 SSH - 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