{"id":87197,"date":"2020-07-05T07:42:02","date_gmt":"2020-07-05T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ssh-klientah-openssh-i-putty"},"modified":"2020-07-05T07:42:02","modified_gmt":"2020-07-05T05:42:02","slug":"uyazvimost-v-ssh-klientah-openssh-i-putty","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-ssh-klientah-openssh-i-putty","title":{"rendered":"Haavatavus SSH-klientides OpenSSH ja PuTTY","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

SSH-klientides OpenSSH ja PuTTY tuvastatud<\/a><\/noindex> haavatavus<\/a><\/noindex> (CVE-2020-14002<\/a><\/noindex> PuTTY ja CVE-2020-14145<\/a><\/noindex> OpenSSH-s), mis viib andmete leket \u00fchenduse kokkuleppimise algoritmis. Haavatavus v\u00f5imaldab r\u00fcndajal, kes suudab klientide liiklust pealt kuulata (n\u00e4iteks kui kasutaja \u00fchendub r\u00fcndaja kontrollitud traadita juurtel), tuvastada algse \u00fchenduse loomise katse hostiga, kui klient pole veel hosti v\u00f5tit vahem\u00e4llu salvestanud. <\/p>\n

Teades, et klient \u00fcritab esmakordselt \u00fchendust luua ja tal ei ole veel oma k\u00fclje peal hosti v\u00f5tit, saab r\u00fcndaja suunata \u00fchenduse enda kaudu (MITM) ja esitada kliendile oma hosti v\u00f5tme, mida SSH-client peab sihthosti v\u00f5tme jaoks, kui v\u00f5tme s\u00f5rmej\u00e4lje kontrollimist ei tehta. Sel viisil v\u00f5ib r\u00fcndaja korraldada MITM-i, tekitamata kahtlusi kasutajas, ja ignoreerida sessioone, kus kliendi k\u00fclje peal on juba vahem\u00e4llu salvestatud hostide v\u00f5ti, mille vale asendamise katse toob kaasa hoiatuse hosti v\u00f5tme muutumise kohta. R\u00fcnnak p\u00f5hineb kasutajate t\u00e4helepanematusele, kes ei kontrolli k\u00e4sitsi hosti v\u00f5tme s\u00f5rmej\u00e4lge esmakordselt \u00fchendust luues. Need, kes v\u00f5tmete s\u00f5rmej\u00e4lgi kontrollivad, on selliste r\u00fcnnakute eest kaitstud.<\/p>\n

Esimene \u00fchenduskatse m\u00e4\u00e4ratakse hosti v\u00f5tme algoritmide loetelu j\u00e4rjekorra muutuse p\u00f5hjal. Kui toimub esimene \u00fchendus, edastab klient vaikes\u00e4tete alusel algoritmide nimekirja, ja kui hosti v\u00f5ti on juba vahem\u00e4lus, paigutatakse seotud algoritm esimeseks (algoritmid j\u00e4rjestatakse eelistuse j\u00e4rgi). <\/p>\n

Probleem ilmneb OpenSSH versioonides 5.7 kuni 8.3 ja PuTTY versioonides 0.68 kuni 0.73. Probleem eemaldatud<\/a><\/noindex> v\u00e4ljalaskes PuTTY 0.74<\/a><\/noindex> lahendatakse, lisades v\u00f5imaluse keelata hosti v\u00f5tme algoritmide loetelu d\u00fcnaamiline koostamine eelistatud j\u00e4rjekorras algoritmide loetelu kasutamise kasuks.<\/p>\n

OpenSSH projekt ei plaani muuta SSH-klientide k\u00e4itumist, kuna kui algoritmi olevat v\u00f5tit ei defineerita esimesena, tehakse katse kasutada algoritmi, mis ei vasta vahem\u00e4llu salvestatud v\u00f5tmele, ning n\u00e4idatakse hoiatust tundmatu v\u00f5tme kohta. See t\u00e4hendab, et valik on j\u00e4rgmine \u2014 kas teave voolab v\u00e4lja (OpenSSH ja PuTTY) v\u00f5i kuvatakse teateid v\u00f5tme muutmise kohta (Dropbear SSH), juhul kui salvestatud v\u00f5ti ei vasta nimekirja vaikimisi esimesena olevatele algoritmidele.<\/p>\n

OpenSSH-s soovitatakse pakkuda alternatiivseid meetodeid hosti v\u00f5tme kontrollimiseks, kasutades SSHFP kirjeid DNSSEC-is ja hosti sertifikaate (PKI). Lisaks on v\u00f5imalik keelata kohandatud hosti v\u00f5tme algoritmide valik, kasutades suvandit HostKeyAlgorithms, ja kasutada suvandit UpdateHostKeys, et saada klientidele p\u00e4rast autentimist t\u00e4iendavaid hosti v\u00f5tmeid.<\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 SSH-\u043a\u043b\u0438\u0435\u043d\u0442\u0430\u0445 OpenSSH \u0438 PuTTY \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-14002 \u0432 PuTTY \u0438 CVE-2020-14145 \u0432 OpenSSH), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0443\u0442\u0435\u0447\u043a\u0435 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u0439 \u0432 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442\u0438\u0442\u044c \u0442\u0440\u0430\u0444\u0438\u043a \u043a\u043b\u0438\u0435\u043d\u0442\u0430 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u0443\u044e \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u043c \u0442\u043e\u0447\u043a\u0443 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0433\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0430), \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u043f\u043e\u043f\u044b\u0442\u043a\u0443 \u043f\u0435\u0440\u0432\u043e\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u043a \u0445\u043e\u0441\u0442\u0443, \u043a\u043e\u0433\u0434\u0430 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u043c \u0435\u0449\u0451 \u043d\u0435 \u043f\u0440\u043e\u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d \u043a\u043b\u044e\u0447 \u0445\u043e\u0441\u0442\u0430. \u0417\u043d\u0430\u044f, \u0447\u0442\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-87197","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Haavatavus SSH klientides OpenSSH ja PuTTY | ProHoster","description":"OpenSSH ja PuTTY SSH klientides avastati haavatavus (CVE-2020-14002 PuTTY-s ja CVE-2020-14145 OpenSSH-s), mis p\u00f5hjustab teabe lekkimist \u00fchenduse \u00fchitamise algoritmis. Haavatavus v\u00f5imaldab r\u00fcndajal, kes suudab kliendi liiklust katkestada (n\u00e4iteks kui kasutaja \u00fchendub r\u00fcndaja kontrollitud Wi-Fi punktiga), tuvastada kliendi algse \u00fchenduse loomise katse hostiga, kui hosti v\u00f5ti pole veel kliendipoolselt vahem\u00e4lus. Teades, et","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-ssh-klientah-openssh-i-putty","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","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\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 SSH-\u043a\u043b\u0438\u0435\u043d\u0442\u0430\u0445 OpenSSH \u0438 PuTTY | ProHoster","og:description":"\u0412 SSH-\u043a\u043b\u0438\u0435\u043d\u0442\u0430\u0445 OpenSSH \u0438 PuTTY \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c 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