{"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\/da\/blog\/administrirovanie\/post-analiz-chto-izvestno-o-poslednej-atake-na-set-serverov-kriptoklyuchej-sks-keyserver","title":{"rendered":"Post-analyse: Hvad vides der om det seneste angreb p\u00e5 netv\u00e6rket af krypton\u00f8gler SKS Keyserver","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Hacks har udnyttet en egenskab i OpenPGP-protokollen, som har v\u00e6ret kendt i mere end ti \u00e5r. <\/p>\n<p>Vi forklarer, hvad der er p\u00e5 spil, og hvorfor det ikke kan lukkes.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461443\/\"><img decoding=\"async\" alt=\"Post-analyse: Hvad vides der om det seneste angreb p\u00e5 netv\u00e6rket af krypton\u00f8gler 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>Problemer i netv\u00e6rket<\/h2>\n<p>\nI midten af juni udf\u00f8rte ukendte <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">et angreb<\/a><\/noindex> p\u00e5 netv\u00e6rket af kryptografiske n\u00f8gle-servere <noindex><a rel=\"nofollow\" href=\"https:\/\/bitbucket.org\/skskeyserver\/sks-keyserver\/src\/default\/\">SKS Keyserver<\/a><\/noindex>, bygget p\u00e5 OpenPGP-protokollen. Dette er en IETF-standard (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc4880\">RFC 4880<\/a><\/noindex>), som bruges til kryptering af e-mails og andre beskeder. SKS-netv\u00e6rket blev oprettet for tredive \u00e5r siden til distribution af offentlige certifikater. V\u00e6rkt\u00f8jer som <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/GnuPG\">GnuPG<\/a><\/noindex> bruges til at kryptere data og oprette digitale signaturer.<\/p>\n<p>Hackerne har kompromitteret certifikaterne for to vedligeholdere af GnuPG-projektet \u2014 Robert Hansen og Daniel Gillmor. Download af det beskadigede certifikat fra serveren medf\u00f8rer, at GnuPG fejler \u2014 systemet fryser simpelthen. Der er grund til at tro, at dette ikke vil stoppe her, og antallet af kompromitterede certifikater kun vil stige. Omfanget af problemet er i \u00f8jeblikket ukendt.<\/p>\n<h2>Angrebsmetoden<\/h2>\n<p>\nHackerne har udnyttet en s\u00e5rbarhed i OpenPGP-protokollen, som samfundet har kendt til i mange \u00e5r. Selv p\u00e5 GitHub <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/micahflee\/trollwot\">kan findes<\/a><\/noindex> findes de relevante exploits. Men indtil videre har ingen p\u00e5taget sig ansvaret for at lukke \"hullet\" (mere om \u00e5rsagerne senere).<\/p>\n<blockquote><p><b>Et par udvalgte indl\u00e6g fra vores blog p\u00e5 Habr:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446634\/\">SDN-digest \u2014 seks emulatorer med open source<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446058\/\">S\u00e5dan bygger du SDN \u2013 otte v\u00e6rkt\u00f8jer med \u00e5bent kildekode<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/433298\/\">Netv\u00e6rks-digest: 17 ekspertartikler om Wi-Fi og 5G<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>\nIf\u00f8lge specifikationen for OpenPGP kan enhver tilf\u00f8je digitale signaturer til certifikater for at bekr\u00e6fte deres ejer. Det maksimale antal signaturer er ikke reguleret. Her opst\u00e5r problemet \u2014 SKS-netv\u00e6rket tillader op til 150.000 signaturer p\u00e5 \u00e9t certifikat, men GnuPG underst\u00f8tter ikke s\u00e5 mange. N\u00e5r certifikatet indl\u00e6ses, fryser GnuPG (ligesom andre implementeringer af OpenPGP).<\/p>\n<p>En af brugerne <noindex><a rel=\"nofollow\" href=\"https:\/\/buttondown.email\/cryptography-dispatches\/archive\/cryptography-dispatches-hello-world-and-openpgp\/\">gennemf\u00f8rte et eksperiment<\/a><\/noindex> \u2014 import af certifikatet tog ham cirka 10 minutter. Certifikatet havde over 54.000 signaturer, og dets st\u00f8rrelse var 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>\nSituationen forv\u00e6rres af det faktum, at OpenPGP-n\u00f8gleservere ikke sletter oplysninger om certifikater. Dette er gjort for at kunne spore hele r\u00e6kken af handlinger med certifikaterne og forhindre deres substitution. Derfor er det ikke muligt at fjerne kompromitterede elementer.<\/p>\n<p>I princippet er SKS-netv\u00e6rket en stor \"filer-server\", hvor enhver kan skrive data. For at illustrere problemet, skabte en resident fra GitHub sidste \u00e5r <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/yakamok\/keyserver-fs\">et filsystem<\/a><\/noindex>, der opbevarer dokumenter i netv\u00e6rket af kryptografiske n\u00f8gleservere.<\/p>\n<h2>Hvorfor s\u00e5rbarheden ikke blev rettet<\/h2>\n<p>\nDer var ingen grund til at lukke s\u00e5rbarheden. Tidligere blev den ikke brugt til at udf\u00f8re hackerangreb. Selvom IT-f\u00e6llesskabet <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=20315633\">l\u00e6nge har bedt<\/a><\/noindex> SKS og OpenPGP-udviklerne om at se n\u00e6rmere p\u00e5 problemet.<\/p>\n<p>Retf\u00e6rdigvis skal det n\u00e6vnes, at de i juni alligevel <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news#2019-06-12-launch\">startede<\/a><\/noindex> et eksperimentelt n\u00f8gleserver <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news\">keys.openpgp.org<\/a><\/noindex>. Den har implementeret beskyttelse mod s\u00e5danne typer angreb. Men dens database fyldes fra bunden, og serveren er ikke en del af SKS. Derfor vil det tage tid, f\u00f8r den kan bruges.<\/p>\n<p><img decoding=\"async\" alt=\"Post-analyse: Hvad vides der om det seneste angreb p\u00e5 netv\u00e6rket af krypton\u00f8gler 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>Hvad ang\u00e5r fejlen i det originale system, er det en kompliceret synkroniseringsmekanisme, der forhindrer rettelsen. N\u00f8gleservernetv\u00e6rket blev oprindeligt skrevet som proof of concept til beskyttelse af Yaron Minsky's doktorafhandling. Og et ret specifikt sprog, OCaml, blev valgt til arbejdet. If\u00f8lge <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">if\u00f8lge<\/a><\/noindex> vedligeholder Robert Hansen er det sv\u00e6rt at forst\u00e5 koden, hvorfor der kun foretages mindre rettelser. For at \u00e6ndre SKS' arkitektur skal den skrives om fra bunden.<\/p>\n<p>Under alle omst\u00e6ndigheder tror GnuPG ikke, at netv\u00e6rket nogensinde vil kunne rettes. I et indl\u00e6g p\u00e5 GitHub skrev udviklerne endda, at de ikke anbefaler at arbejde med SKS-n\u00f8gleserveren. Faktisk er det en af de vigtigste grunde til, at de har initieret overgangen til den nye service keys.openpgp.org. Vi kan kun f\u00f8lge udviklingen fremover.<\/p>\n<blockquote><p><b>Et par materialer fra vores virksomhedsbog:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/botnet-spamit-cherez-routery\/\">Botnet \"spammer\" gennem routere: hvad du skal vide<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/ddos-i-5g-tolshhe-truba-bolshe-problem\/\">DDoS og 5G: tykkere \"r\u00f8r\" \u2014 flere problemer<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/firewall-ili-dpi-instrumenty-zashhity-raznogo-naznacheniya\/\">Firewall eller DPI \u2014 beskyttelsesv\u00e6rkt\u00f8jer med forskellig anvendelse<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/telekom\/internet-v-derevnyu-stroim-radiorelejnuyu-wi-fi-set\/\">Internet i landsbyen \u2013 bygger et radiorele Wi-Fi-netv\u00e6rk<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>Kilde: <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 5.0.3 - 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 name=\"robots\" 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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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