{"id":183976,"date":"2026-10-23T23:40:30","date_gmt":"2026-10-23T21:40:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/okolo-10-vyhodnyh-uzlov-tor-byli-vovlecheny-v-ataku-po-perehvatu-ssh-podklyuchenij"},"modified":"2026-10-23T23:40:35","modified_gmt":"2026-10-23T21:40:35","slug":"around-10-percent-of-tor-exit-nodes-were-involved-in-an-ssh-connection-hijacking-attack","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/around-10-percent-of-tor-exit-nodes-were-involved-in-an-ssh-connection-hijacking-attack","title":{"rendered":"Pribli\u017ene 10 % v\u00fdstupn\u00fdch uzlov Tor bolo zapojen\u00fdch do \u00fatoku na zachyt\u00e1vanie SSH pripojen\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Boli zverejnen\u00e9 podrobnosti o incidente, pri ktorom sa \u00fato\u010dn\u00edkom podarilo z\u00edska\u0165 kontrolu nad 333 v\u00fdstupn\u00fdmi uzlami siete Tor (celkovo je v Tor pribli\u017ene 3000 v\u00fdstupn\u00fdch uzlov) a zorganizova\u0165 na nich z\u00e1chyt ne\u0161ifrovan\u00e9ho prenosu d\u00e1t a presmerovanie SSH pripojen\u00ed. \u00datok sa za\u010dal 2. okt\u00f3bra (v piatok ve\u010der), ale bol zisten\u00fd a za\u010dal sa blokova\u0165 4. okt\u00f3bra. 5. okt\u00f3bra boli v\u0161etky skompromitovan\u00e9 servery odpojen\u00e9 oper\u00e1tormi alebo samotn\u00fdmi \u00fato\u010dn\u00edkmi. Preverenie uk\u00e1zalo, \u017ee \u00fato\u010dn\u00edci z\u00edskali pr\u00edstup k serverom dva mesiace pred za\u010diatkom \u00fatoku na pou\u017e\u00edvate\u013eov Tor a nain\u0161talovali do skompromitovan\u00fdch syst\u00e9mov malware Ebury 1.8.3.<\/p>\n

Cie\u013eom \u00fatoku bol z\u00e1chyt hesiel, k\u013e\u00fa\u010dov a d\u00f4vern\u00fdch inform\u00e1ci\u00ed v tranzitnom ne\u0161ifrovanom prenosu d\u00e1t, ako aj z\u00edskanie hesiel pre SSH. Pri anal\u00fdze ne\u0161ifrovan\u00e9ho prenosu sa \u00fato\u010dn\u00edci s\u00fastredili na po\u017eiadavky bez \u0161ifrovania na po\u0161tov\u00e9 servery. Na stimul\u00e1ciu n\u00e1vratu k pr\u00e1ci bez \u0161ifrovania na v\u00fdstupn\u00fdch uzloch bolo zablokovan\u00fdch nieko\u013eko sie\u0165ov\u00fdch portov, ktor\u00e9 sa pou\u017e\u00edvali na organiz\u00e1ciu \u0161ifrovan\u00e9ho komunika\u010dn\u00e9ho kan\u00e1la s po\u0161tov\u00fdmi servermi<\/a>. Ne\u0161ifrovan\u00fd prenos d\u00e1t sa analyzoval za behu.<\/p>\n

Na zhroma\u017e\u010fovanie hesiel pre SSH bolo zorganizovan\u00e9 presmerovanie SSH po\u017eiadaviek na jeden z 12 serverov \u00fato\u010dn\u00edkov. Tieto servery prij\u00edmali pripojenia cez SSH a zobrazovali v\u00fdzvu na zadanie hesla od vlastn\u00e9ho servera<\/a>, ku ktor\u00e9mu sa pripojovalo. Ke\u010f\u017ee hostite\u013esk\u00e9 k\u013e\u00fa\u010de sa nezhodovali, ssh na strane klienta vyd\u00e1val varovanie o pripojen\u00ed k nezn\u00e1memu serveru<\/a>. <\/p>\n

Ak pou\u017e\u00edvate\u013e ignoroval toto varovanie a zadal heslo na pripojenie, malware server<\/a> poskytoval pripojenie k legit\u00edmnemu cie\u013eov\u00e9mu SSH serveru, uchov\u00e1val zadan\u00e9 heslo obete a interceptoval inform\u00e1cie o \u010dinnostiach v SSH session. S\u00fa\u010dasne sa uskuto\u010dnilo pripojenie k cie\u013eov\u00e9mu serveru so zachyten\u00fdm heslom a na\u0148 sa nain\u0161taloval malware Ebury. Z\u00edskan\u00edm kontroly nad Linux servermi, ktor\u00e9 neboli v\u00fdstupn\u00fdmi uzlami Tor, \u00fato\u010dn\u00edci menili nastavenia v s\u00fabore torrc a prev\u00e1dzali ich na nov\u00e9 malv\u00e9rom infikovan\u00e9 v\u00fdstupn\u00e9 uzly Tor.<\/p>\n

<\/center><\/p>\n

Na ur\u010denie v\u0161etk\u00fdch \u0161kodliv\u00fdch v\u00fdstupn\u00fdch uzlov, v\u00fdskumn\u00edk, ktor\u00fd probl\u00e9my odhalil, pou\u017eil n\u00e1stroj exitmap na preh\u013eadanie v\u0161etk\u00fdch v\u00fdstupn\u00fdch uzlov, nadviazanie SSH pripojenia cez ka\u017ed\u00fd z nich a kontrolu, \u010di d\u00f4jde k presmerovaniu po\u017eiadavky. Ako sa \u00fato\u010dn\u00edkom podarilo z\u00edska\u0165 pr\u00edstup k zachyten\u00fdm Tor uzlom, zatia\u013e nie je jasn\u00e9, medzi in\u00fdm sa vznes\u00fa
\n predpoklady o kompromit\u00e1cii oper\u00e1torov hostingu.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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