{"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\/sv\/blog\/news\/around-10-percent-of-tor-exit-nodes-were-involved-in-an-ssh-connection-hijacking-attack","title":{"rendered":"Cirka 10% av Tor-utg\u00e5ngsnoderna var involverade i attacken f\u00f6r att avlyssna SSH-anslutningar.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Detaljer om h\u00e4ndelsen har publicerats, d\u00e4r angriparna lyckades f\u00e5 kontroll \u00f6ver 333 utg\u00e5ngsst\u00e4llen i Tor-n\u00e4tverket (totalt finns det cirka 3000 utg\u00e5ngsst\u00e4llen i Tor) och organisera avlyssning av okrypterad trafik samt omdirigera SSH-anslutningar. Attacken inleddes den 2 oktober (p\u00e5 fredagskv\u00e4llen), men uppt\u00e4cktes och b\u00f6rjade blockeras den 4 oktober. Den 5 oktober st\u00e4ngdes alla komprometterade servrar av operat\u00f6rerna eller av angriparna sj\u00e4lva. Utredningen visade att angriparna f\u00e5tt \u00e5tkomst till servrarna tv\u00e5 m\u00e5nader innan attacken p\u00e5 Tor-anv\u00e4ndarna och installerade skadlig programvara Ebury 1.8.3 i de komprometterade systemen.<\/p>\n

M\u00e5let med attacken var att avlyssna l\u00f6senord, nycklar och konfidentiell information i den okrypterade transittrafiken, samt att f\u00e5 fatt p\u00e5 l\u00f6senord f\u00f6r SSH. Vid analysen av den okrypterade trafiken fokuserade angriparna p\u00e5 oenkrypterade anrop till e-postservrar. F\u00f6r att stimulera tillbakatill arbete utan kryptering p\u00e5 utg\u00e5ngsst\u00e4llena blockerades n\u00e4tverksportar som anv\u00e4ndes f\u00f6r att etablera en krypterad kommunikationskanal med e-posten. servrar<\/a>. Den okrypterade trafiken analyserades i realtid.<\/p>\n

F\u00f6r att samla in SSH-l\u00f6senord organiserades omdirigering av SSH-f\u00f6rfr\u00e5gningar till en av 12 servrar som tillh\u00f6rde angriparna. Dessa servrar tog emot SSH-anslutningen och visade en l\u00f6senordsprompt \u00e5 servern<\/a>, som ansl\u00f6t. Eftersom v\u00e4rdnycklarna inte st\u00e4mde \u00f6verens, gav ssh p\u00e5 klientens sida en varning om att ansluta till en ok\u00e4nd servern<\/a>. <\/p>\n

Om anv\u00e4ndaren ignorerade denna varning och skrev in l\u00f6senordet f\u00f6r anslutning, s\u00e5 vidarebefordrade den skadliga server<\/a> anslutningen till en legitim m\u00e5lsatt SSH-server, sparade det inmatade l\u00f6senordet fr\u00e5n offret och avlyssnade information om aktiviteter i SSH-sessionen. Samtidigt gjordes en anslutning till m\u00e5lsservern med det f\u00e5ngade l\u00f6senordet och installerades skadlig programvara Ebury p\u00e5 den. Genom att f\u00e5 kontroll \u00f6ver Linux-servrar som inte var utg\u00e5ngsst\u00e4llen f\u00f6r Tor, \u00e4ndrade angriparna inst\u00e4llningarna i torrc-filen och f\u00f6rvandlade dem till nya skadliga utg\u00e5ngsst\u00e4llen f\u00f6r Tor.<\/p>\n

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

F\u00f6r att identifiera alla skadliga utg\u00e5ngsnoder anv\u00e4nde forskaren verktyget exitmap f\u00f6r att iterera \u00f6ver alla utg\u00e5ngsnoder, uppr\u00e4tta SSH-anslutningar genom var och en av dem och kontrollera om en omdirigering av f\u00f6rfr\u00e5gan hade \u00e4gt rum. Hur angriparna fick tillg\u00e5ng till de kapade Tor-noderna \u00e4r fortfarande oklart, bland annat framf\u00f6rs
\n hypoteser om kompromettering av hostingoperat\u00f6rer.
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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