{"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\/pl\/blog\/administrirovanie\/post-analiz-chto-izvestno-o-poslednej-atake-na-set-serverov-kriptoklyuchej-sks-keyserver","title":{"rendered":"Post-analityka: co wiadomo o ostatnim ataku na sie\u0107 serwer\u00f3w kluczy kryptograficznych SKS Keyserver","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Hakerzy wykorzystali cech\u0119 protoko\u0142u OpenPGP, o kt\u00f3rej wiadomo od ponad dziesi\u0119ciu lat. <\/p>\n<p>Wyja\u015bniamy, na czym to polega i dlaczego nie da si\u0119 tego naprawi\u0107.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461443\/\"><img decoding=\"async\" alt=\"Post-analityka: co wiadomo o ostatnim ataku na sie\u0107 serwer\u00f3w kluczy kryptograficznych 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>Problemy w sieci<\/h2>\n<p>\nW po\u0142owie czerwca nieznani sprawcy <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">przeprowadzili atak<\/a><\/noindex> na sie\u0107 serwer\u00f3w kluczy kryptograficznych <noindex><a rel=\"nofollow\" href=\"https:\/\/bitbucket.org\/skskeyserver\/sks-keyserver\/src\/default\/\">SKS Keyserver<\/a><\/noindex>, opart\u0105 na protokole OpenPGP. To standard IETF (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc4880\">RFC 4880<\/a><\/noindex>), kt\u00f3ry jest u\u017cywany do szyfrowania e-maili i innych wiadomo\u015bci. Sie\u0107 SKS zosta\u0142a stworzona trzydzie\u015bci lat temu w celu dystrybucji publicznych certyfikat\u00f3w. Do sieci \u0142\u0105cz\u0105 si\u0119 takie narz\u0119dzia jak <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/GnuPG\">GnuPG<\/a><\/noindex> do szyfrowania danych i tworzenia elektronicznych podpis\u00f3w.<\/p>\n<p>Hakerzy skompromitowali certyfikaty dw\u00f3ch g\u0142\u00f3wnych wsp\u00f3\u0142tw\u00f3rc\u00f3w projektu GnuPG \u2014 Roberta Hansena i Daniela Gillmora. Pobranie uszkodzonego certyfikatu z serwera powoduje awari\u0119 GnuPG \u2014 system po prostu si\u0119 zawiesza. Istniej\u0105 podstawy, aby s\u0105dzi\u0107, \u017ce na tym sprawcy si\u0119 nie zatrzymaj\u0105, a liczba skompromitowanych certyfikat\u00f3w tylko wzro\u015bnie. Na chwil\u0119 obecn\u0105 skala problemu pozostaje nieznana.<\/p>\n<h2>Istota ataku<\/h2>\n<p>\nHakerzy wykorzystali luk\u0119 w protokole OpenPGP. Jest ona znana spo\u0142eczno\u015bci od wielu lat. Nawet na GitHubie <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/micahflee\/trollwot\">mo\u017cna znale\u017a\u0107<\/a><\/noindex> s\u0105 odpowiednie exploity. Ale jak dot\u0105d nikt nie wzi\u0105\u0142 odpowiedzialno\u015bci za za\u0142ataniu \"dziury\" (o przyczynach porozmawiamy p\u00f3\u017aniej).<\/p>\n<blockquote><p><b>Dwie kompilacje z naszego bloga na Habrze:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446634\/\">SDN-digest \u2014 sze\u015b\u0107 emulator\u00f3w z otwartym kodem \u017ar\u00f3d\u0142owym<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446058\/\">Jak zbudowa\u0107 SDN \u2014 osiem narz\u0119dzi z otwartym \u017ar\u00f3d\u0142em<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/433298\/\">Digest sieciowy: 17 materia\u0142\u00f3w eksperckich o Wi-Fi i 5G<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>\nZgodnie ze specyfikacj\u0105 OpenPGP ka\u017cdy mo\u017ce dodawa\u0107 podpisy cyfrowe do certyfikat\u00f3w w celu potwierdzenia ich w\u0142a\u015bciciela. Co wi\u0119cej, maksymalna liczba podpis\u00f3w nie jest w \u017caden spos\u00f3b regulowana. A tutaj pojawia si\u0119 problem \u2014 sie\u0107 SKS pozwala umieszcza\u0107 do 150 tys. podpis\u00f3w na jednym certyfikacie, ale GnuPG nie obs\u0142uguje ich takiej liczby. W ten spos\u00f3b przy pobieraniu certyfikatu GnuPG (jak i innych realizacji OpenPGP) zawiesza si\u0119.<\/p>\n<p>Jeden z u\u017cytkownik\u00f3w <noindex><a rel=\"nofollow\" href=\"https:\/\/buttondown.email\/cryptography-dispatches\/archive\/cryptography-dispatches-hello-world-and-openpgp\/\">przeprowadzi\u0142 eksperyment<\/a><\/noindex> \u2014 import certyfikatu zaj\u0105\u0142 mu oko\u0142o 10 minut. Certyfikat mia\u0142 ponad 54 tys. podpis\u00f3w, a jego rozmiar wyni\u00f3s\u0142 17 MB:<\/p>\n<pre><code class=\"bash\">$ gpg --homedir=$PWD --recv C4BC2DDB38CCE96485EBE9C2F20691179038E5C6\ngpg: klucz F20691179038E5C6: 4 duplikaty podpis\u00f3w usuni\u0119to\ngpg: klucz F20691179038E5C6: 54614 podpis\u00f3w nie sprawdzono z powodu brakuj\u0105cych kluczy\ngpg: klucz F20691179038E5C6: 4 podpisy przerejestrowano\ngpg: klucz F20691179038E5C6: klucz publiczny \"Daniel Kahn Gillmor &lt;dkg@fifthhorseman.net&gt;\" zaimportowany\ngpg: nie znaleziono kluczy ostatecznie zaufanych\ngpg: \u0141\u0105czna liczba przetworzonych: 1\ngpg:               zaimportowanych: 1\n$ ls -lh pubring.gpg\n-rw-r--r--  1 filippo  staff    17M  2 lip 16:30 pubring.gpg\n<\/code><\/pre>\n<p>\nSytuacj\u0119 pogarsza fakt, \u017ce serwery kluczy OpenPGP nie usuwaj\u0105 informacji o certyfikat\u00f3w. Zosta\u0142o to zrobione, aby m\u00f3c \u015bledzi\u0107 wszystkie dzia\u0142ania z certyfikat\u00f3w i wykluczy\u0107 ich podmian\u0119. Dlatego nie mo\u017cna zlikwidowa\u0107 skompromitowanych element\u00f3w.<\/p>\n<p>W istocie sie\u0107 SKS jest du\u017cym \u201eserwerem plik\u00f3w\u201d, na kt\u00f3ry ka\u017cdy mo\u017ce zapisa\u0107 dane. Aby zilustrowa\u0107 problem, w ubieg\u0142ym roku rezydent GitHub <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/yakamok\/keyserver-fs\">stworzy\u0142 system plik\u00f3w<\/a><\/noindex>, kt\u00f3ry przechowuje dokumenty w sieci serwer\u00f3w kluczy kryptograficznych.<\/p>\n<h2>Dlaczego nie zamkni\u0119to luki<\/h2>\n<p>\nNie by\u0142o podstaw do zamkn\u0119cia luki. Wcze\u015bniej nie by\u0142a wykorzystywana do przeprowadzenia atak\u00f3w hakerskich. Mimo to spo\u0142eczno\u015b\u0107 IT <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=20315633\">od dawna prosi\u0142a<\/a><\/noindex> deweloper\u00f3w SKS i OpenPGP o zwr\u00f3cenie uwagi na problem.<\/p>\n<p>Z s\u0142uszno\u015bci warto zauwa\u017cy\u0107, \u017ce w czerwcu w ko\u0144cu <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news#2019-06-12-launch\">uruchomili<\/a><\/noindex> eksperymentalny serwer kluczy <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news\">keys.openpgp.org<\/a><\/noindex>. W nim wdro\u017cono ochron\u0119 przed tego rodzaju atakami. Niemniej jednak jego baza danych jest wype\u0142niana od zera, a sam serwer nie jest cz\u0119\u015bci\u0105 SKS. Dlatego minie troch\u0119 czasu, zanim b\u0119dzie mo\u017cna z niego korzysta\u0107.<\/p>\n<p><img decoding=\"async\" alt=\"Post-analityka: co wiadomo o ostatnim ataku na sie\u0107 serwer\u00f3w kluczy kryptograficznych 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>Je\u015bli chodzi o b\u0142\u0105d w oryginalnym systemie, to trudno go naprawi\u0107 z powodu skomplikowanego mechanizmu synchronizacji. Sie\u0107 serwer\u00f3w kluczy by\u0142a pocz\u0105tkowo tworzona jako proof of concept dla obrony pracy doktorskiej Yaron Minsky'ego. Co wi\u0119cej, do pracy wybrano do\u015b\u0107 specyficzny j\u0119zyk OCaml. Z <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">s\u0142owami<\/a><\/noindex> wed\u0142ug maintanera Roberta Hansena, zrozumienie kodu jest trudne, dlatego wprowadza si\u0119 jedynie niewielkie poprawki. Aby zmodyfikowa\u0107 architektur\u0119 SKS, trzeba b\u0119dzie przepisa\u0107 j\u0105 od podstaw.<\/p>\n<p>W ka\u017cdym razie w GnuPG nie wierz\u0105, \u017ce sie\u0107 kiedykolwiek zostanie naprawiona. W po\u015bcie na GitHub deweloperzy nawet napisali, \u017ce nie rekomenduj\u0105 pracy z serwerem kluczy SKS. W\u0142a\u015bciwie to jedna z g\u0142\u00f3wnych przyczyn, dla kt\u00f3rych zainicjowali przej\u015bcie na now\u0105 us\u0142ug\u0119 keys.openpgp.org. Pozostaje nam tylko obserwowa\u0107 dalszy rozw\u00f3j wydarze\u0144.<\/p>\n<blockquote><p><b>Kilka materia\u0142\u00f3w z naszego bloga korporacyjnego:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/botnet-spamit-cherez-routery\/\">Botnet \"spamuje\" przez routery: co warto wiedzie\u0107<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/ddos-i-5g-tolshhe-truba-bolshe-problem\/\">DDoS i 5G: grubsza \u201erura\u201d \u2014 wi\u0119cej problem\u00f3w<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/firewall-ili-dpi-instrumenty-zashhity-raznogo-naznacheniya\/\">Firewall lub DPI \u2014 narz\u0119dzia ochrony o r\u00f3\u017cnym przeznaczeniu<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/telekom\/internet-v-derevnyu-stroim-radiorelejnuyu-wi-fi-set\/\">Internet w wsi \u2014 budujemy radiow\u0105 sie\u0107 Wi-Fi<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>\u0179r\u00f3d\u0142o: <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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