{"id":36619,"date":"2019-10-31T22:12:43","date_gmt":"2019-10-31T19:12:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/post-analiz-chto-izvestno-o-poslednej-atake-na-set-serverov-kriptoklyuchej-sks-keyserver\/"},"modified":"2019-10-31T22:12:43","modified_gmt":"2019-10-31T19:12:43","slug":"post-analiz-chto-izvestno-o-poslednej-atake-na-set-serverov-kriptoklyuchej-sks-keyserver","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/post-analiz-chto-izvestno-o-poslednej-atake-na-set-serverov-kriptoklyuchej-sks-keyserver","title":{"rendered":"Post-anal\u00fc\u00fcs: mida on teada viimase r\u00fcnnaku kohta kr\u00fcptov\u00f5tmete veebiserverite SKS Keyserver","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>H\u00e4kkerid kasutasid OpenPGP protokolli omadust, mis on teada olnud \u00fcle k\u00fcmne aasta. <\/p>\n<p>Selgitame, mis on tuum ja miks seda ei saa sulgeda.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461443\/\"><img decoding=\"async\" alt=\"Post-anal\u00fc\u00fcs: mida on teada viimase r\u00fcnnaku kohta kr\u00fcptov\u00f5tmete veebiserverite SKS Keyserver\" src=\"\/wp-content\/uploads\/2019\/07\/d8fec24b72a147e758eb1174eecb7336.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>\/ Unsplash \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/8fs1X0JFgFE\">Chunlea Ju<\/a><\/noindex><\/i><\/p>\n<h2>Probleemid v\u00f5rgus<\/h2>\n<p>\nJuuni keskpaiku m\u00e4\u00e4ratlemata isikud <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">teostasid r\u00fcnnaku<\/a><\/noindex> kr\u00fcptograafiliste v\u00f5tmete serverite v\u00f5rgule <noindex><a rel=\"nofollow\" href=\"https:\/\/bitbucket.org\/skskeyserver\/sks-keyserver\/src\/default\/\">SKS Keyserver<\/a><\/noindex>, mis on loodud OpenPGP protokolli p\u00f5hjal. See on IETF standard (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc4880\">RFC 4880<\/a><\/noindex>), mida kasutatakse e-kirjade ja muude s\u00f5numite kr\u00fcpteerimiseks. SKS v\u00f5rgustiku l\u00f5id kolmk\u00fcmmend aastat tagasi avalike sertifikaatide jagamiseks. Sellised t\u00f6\u00f6riistad nagu <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/GnuPG\">GnuPG<\/a><\/noindex> andmete kr\u00fcpteerimise ja digitaalse allkirja loomise jaoks on sellele \u00fchendatud.<\/p>\n<p>H\u00e4kkerid on kompromiteerinud kahe GnuPG projekti hooldaja sertifikaate \u2014 Robert Hansen ja Daniel Gillmor. Rikkunud sertifikaadi allalaadimine serverist toob kaasa GnuPG t\u00f6\u00f6katkestuse \u2014 s\u00fcsteem lihtsalt hangub. On alust arvata, et kurjategijad ei kavatse sellega piirduda ja kompromiteeritud sertifikaatide arv t\u00f5useb ainult. Praegu on probleemi ulatus teadmata.<\/p>\n<h2>R\u00fcnnaku tuum<\/h2>\n<p>\nH\u00e4kkerid kasutasid OpenPGP protokolli haavatavust. See on kogukonnale teada juba mitmeid k\u00fcmneid aastaid. Isegi GitHubis <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/micahflee\/trollwot\">saab leida<\/a><\/noindex> on vastavad eksploitid. Kuid seni ei ole keegi vastutust v\u00f5tnud \"augu\" sulgemise eest (hiljem r\u00e4\u00e4gime p\u00f5hjustest l\u00e4hemalt).<\/p>\n<blockquote><p><b>M\u00f5ned valikud meie blogist Habrast:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446634\/\">SDN-digests \u2014 kuus avatud l\u00e4htekoodiga emulaatorit<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446058\/\">Kuidas luua SDN \u2014 kaheksa avatud l\u00e4htekoodiga t\u00f6\u00f6riista<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/433298\/\">V\u00f5rgudigest: 17 eksperti materjali Wi-Fi ja 5G kohta<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>\nOpenPGP spetsifikatsiooni kohaselt v\u00f5ib iga\u00fcks lisada digitaalallkirju sertifikaatide juurde, et kinnitada nende omaniku. T\u00e4iendavate allkirjade maksimaalne arv ei ole reguleeritud. Probleem on selles, et SKS v\u00f5rk lubab \u00fchele sertifikaadile paigutada kuni 150 tuhat allkirja, kuid GnuPG ei toeta nii suurt arvu. Seega, kui GnuPG (nagu ka teised OpenPGP rakendused) p\u00fc\u00fcab sertifikaati laadida, hangub see.<\/p>\n<p>m\u00e4rkis <noindex><a rel=\"nofollow\" href=\"https:\/\/buttondown.email\/cryptography-dispatches\/archive\/cryptography-dispatches-hello-world-and-openpgp\/\">tegi katse<\/a><\/noindex> \u2014 sertifikaadi import v\u00f5ttis tal aega umbes 10 minutit. Sertifikaadil oli \u00fcle 54 tuhande allkirja ja selle suurus oli 17 MB:<\/p>\n<pre><code class=\"bash\">$ gpg --homedir=$PWD --recv C4BC2DDB38CCE96485EBE9C2F20691179038E5C6\ngpg: key F20691179038E5C6: 4 duplicate signatures removed\ngpg: key F20691179038E5C6: 54614 signatures not checked due to missing keys\ngpg: key F20691179038E5C6: 4 signatures reordered\ngpg: key F20691179038E5C6: public key \"Daniel Kahn Gillmor \" imported\ngpg: no ultimately trusted keys found\ngpg: Total number processed: 1\ngpg:               imported: 1\n$ ls -lh pubring.gpg\n-rw-r--r--  1 filippo  staff    17M  2 Jul 16:30 pubring.gpg\n<\/code><\/pre>\n<p>\nOlukord halvendab asjaolu, et OpenPGP v\u00f5tme serverid ei kustuta sertifikaatide teavet. Nii on korraldatud, et oleks v\u00f5imalik j\u00e4lgida k\u00f5iki sertifikaatidega toimuvaid toiminguid ja v\u00e4listada nende asendamine. Seet\u00f5ttu ei saa kompromiteeritud elemente k\u00f5rvaldada.<\/p>\n<p>Sisuliselt on SKS v\u00f5rk suur \"failiserver\", kuhu iga\u00fcks v\u00f5ib andmeid kirjutada. Probleemi illustreerimiseks l\u00f5i eelmisel aastal GitHubi resident <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/yakamok\/keyserver-fs\">failis\u00fcsteemi<\/a><\/noindex>, mis salvestab dokumente kr\u00fcptograafiliste v\u00f5tme serverite v\u00f5rgus.<\/p>\n<h2>Miks haavatavust ei likvideeritud<\/h2>\n<p>\nHaavatavuse sulgemiseks ei olnud p\u00f5hjust. Varasemalt ei ole seda kuritarvitatud h\u00e4kkerir\u00fcnnakute korral. Kuigi IT-kogukond <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=20315633\">on pikka aega palunud<\/a><\/noindex> SKS ja OpenPGP arendajatel sellele probleemile t\u00e4helepanu p\u00f6\u00f6rata.<\/p>\n<p>\u00d5igusem\u00f5istmise nimel tuleb m\u00e4rkida, et juunis nad siiski <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news#2019-06-12-launch\">k\u00e4ivitasid<\/a><\/noindex> katseliselt k\u00e4ivitasid v\u00f5tme serveri <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news\">keys.openpgp.org<\/a><\/noindex>. Selles on rakendatud kaitse sarnaste r\u00fcnnakute vastu. Siiski t\u00e4itub selle andmebaas nullist ja server ei ole osa SKS-ist. Seega kulub aega, enne kui seda saab kasutada.<\/p>\n<p><img decoding=\"async\" alt=\"Post-anal\u00fc\u00fcs: mida on teada viimase r\u00fcnnaku kohta kr\u00fcptov\u00f5tmete veebiserverite SKS Keyserver\" src=\"\/wp-content\/uploads\/2019\/07\/6ab10981f7c6215cede6e26c2fd3aa5c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>\/ Unsplash \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/_DkmMhzrsYY\">Rub\u00e9n Bag\u00fc\u00e9s<\/a><\/noindex><\/i><\/p>\n<p>Mis puutub originaals\u00fcsteemi veasse, siis selle parandamist takistab keeruline s\u00fcnkroniseerimise mehhanism. V\u00f5tme serverite v\u00f5rk kirjutati algselt v\u00e4lja m\u00f5tlemise t\u00f5endina Yaron Minsky doktori v\u00e4itekirja kaitsmiseks. Samuti valiti t\u00f6\u00f6ks \u00fcsna spetsiifiline keel OCaml. Vastavalt <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">s\u00f5nadele<\/a><\/noindex> peahalduri Robert Hanseni s\u00f5nadele on koodis orienteerumine keeruline, seet\u00f5ttu tehakse sinna vaid v\u00e4ikseid parandusi. SKS arhitektuuri muutmiseks tuleb see nullist \u00fcmber kirjutada.<\/p>\n<p>Igal juhul ei usu GnuPG, et v\u00f5rk kunagi parandatakse. GitHubi postituses m\u00e4rkisid arendajad isegi, et nad ei soovita SKS v\u00f5tme serveriga t\u00f6\u00f6tada. Tegelikult on see \u00fcks peamisi p\u00f5hjusi, miks nad algatasid \u00fclemineku uuele teenusele keys.openpgp.org. Meile j\u00e4\u00e4b \u00fcle vaid j\u00e4lgida, kuidas s\u00fcndmustel edasi areneb.<\/p>\n<blockquote><p><b>M\u00f5ned materjalid meie ettev\u00f5tte blogist:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/botnet-spamit-cherez-routery\/\">Botnet \"spamib\" l\u00e4bi ruuterite: mida on vaja teada<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/ddos-i-5g-tolshhe-truba-bolshe-problem\/\">DDoS ja 5G: paksenenud \"toru\" - rohkem probleeme<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/firewall-ili-dpi-instrumenty-zashhity-raznogo-naznacheniya\/\">Firewall v\u00f5i DPI - erinevate otstarvete kaitsemeetmed<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/telekom\/internet-v-derevnyu-stroim-radiorelejnuyu-wi-fi-set\/\">Interneti\u00fchendus k\u00fcladele - ehitame raadiosuhtelise Wi-Fi v\u00f5rgu<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461443\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0425\u0430\u043a\u0435\u0440\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0438 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 OpenPGP, \u043e \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e \u0431\u043e\u043b\u0435\u0435 \u0434\u0435\u0441\u044f\u0442\u0438 \u043b\u0435\u0442. \u0420\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c, \u0432 \u0447\u0435\u043c \u0441\u0443\u0442\u044c \u0438 \u043f\u043e\u0447\u0435\u043c\u0443 \u0435\u0451 \u043d\u0435 \u043c\u043e\u0433\u0443\u0442 \u0437\u0430\u043a\u0440\u044b\u0442\u044c. \/ Unsplash \/ Chunlea Ju \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0441\u0435\u0442\u0438 \u0412 \u0441\u0435\u0440\u0435\u0434\u0438\u043d\u0435 \u0438\u044e\u043d\u044f \u043d\u0435\u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0435 \u043f\u0440\u043e\u0432\u0435\u043b\u0438 \u0430\u0442\u0430\u043a\u0443 \u043d\u0430 \u0441\u0435\u0442\u044c \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u043a\u043b\u044e\u0447\u0435\u0439 SKS Keyserver, \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0443\u044e \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 OpenPGP. \u042d\u0442\u043e \u2014 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 IETF (RFC 4880), \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27422,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-36619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0425\u0430\u043a\u0435\u0440\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0438 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 OpenPGP, \u043e \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e \u0431\u043e\u043b\u0435\u0435 \u0434\u0435\u0441\u044f\u0442\u0438 \u043b\u0435\u0442.\" \/>\n\t<meta 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\u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e \u043e \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439 \u0430\u0442\u0430\u043a\u0435 \u043d\u0430 \u0441\u0435\u0442\u044c \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u043a\u0440\u0438\u043f\u0442\u043e\u043a\u043b\u044e\u0447\u0435\u0439 SKS Keyserver | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0425\u0430\u043a\u0435\u0440\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0438 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 OpenPGP, \u043e \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e \u0431\u043e\u043b\u0435\u0435 \u0434\u0435\u0441\u044f\u0442\u0438 \u043b\u0435\u0442.\" \/>\n\t\t<meta property=\"og:url\" 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