{"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\/sv\/blog\/administrirovanie\/post-analiz-chto-izvestno-o-poslednej-atake-na-set-serverov-kriptoklyuchej-sks-keyserver","title":{"rendered":"Postanalys: vad vet vi om den senaste attacken mot n\u00e4tverket av kryptonycklar SKS Keyserver","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Hackerna utnyttjade en s\u00e5rbarhet i OpenPGP-protokollet som varit k\u00e4nd i \u00f6ver tio \u00e5r. <\/p>\n<p>Vi f\u00f6rklarar vad det handlar om och varf\u00f6r det inte kan st\u00e4ngas ner.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/461443\/\"><img decoding=\"async\" alt=\"Postanalys: vad vet vi om den senaste attacken mot n\u00e4tverket av kryptonycklar 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>Problem i n\u00e4tverket<\/h2>\n<p>\nI mitten av juni utf\u00f6rde ok\u00e4nda <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">en attack<\/a><\/noindex> mot n\u00e4tverket av kryptografiska nyckelservrar <noindex><a rel=\"nofollow\" href=\"https:\/\/bitbucket.org\/skskeyserver\/sks-keyserver\/src\/default\/\">SKS Keyserver<\/a><\/noindex>, baserat p\u00e5 OpenPGP-protokollet. Det \u00e4r en standard fr\u00e5n IETF (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc4880\">RFC 4880<\/a><\/noindex>), som anv\u00e4nds f\u00f6r att kryptera e-post och andra meddelanden. SKS-n\u00e4tverket skapades f\u00f6r tretti \u00e5r sedan f\u00f6r att distribuera offentliga certifikat. Anv\u00e4ndare som <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/GnuPG\">GnuPG<\/a><\/noindex> anv\u00e4nder f\u00f6r att kryptera data och skapa elektroniska digitala signaturer.<\/p>\n<p>Hackerna har komprometterat certifikaten f\u00f6r tv\u00e5 maintainers av GnuPG-projektet \u2014 Robert Hansen och Daniel Gillmor. Att ladda ner det skadade certifikatet fr\u00e5n servern orsakar ett fel i GnuPG \u2014 systemet h\u00e4nger helt enkelt. Det finns sk\u00e4l att tro att detta inte kommer att sluta h\u00e4r, och antalet komprometterade certifikat kommer bara att \u00f6ka. F\u00f6r n\u00e4rvarande \u00e4r omfattningen av problemet oklar.<\/p>\n<h2>Attackens k\u00e4rna<\/h2>\n<p>\nHackerna utnyttjade en s\u00e5rbarhet i OpenPGP-protokollet. Den har varit k\u00e4nd f\u00f6r samh\u00e4llet i \u00f6ver ett decennium. \u00c4ven p\u00e5 GitHub <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/micahflee\/trollwot\">g\u00e5r det att hitta<\/a><\/noindex> relaterade exploits. Men hittills har ingen tagit p\u00e5 sig ansvaret f\u00f6r att st\u00e4nga \"h\u00e5let\" (vi kommer att diskutera orsakerna mer detaljerat senare).<\/p>\n<blockquote><p><b>Tv\u00e5 urval fr\u00e5n v\u00e5r blogg p\u00e5 Habr:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446634\/\">SDN-digest - sex emulatorer med \u00f6ppen k\u00e4llkod<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/446058\/\">Hur man bygger ett SDN - \u00e5tta verktyg med \u00f6ppen k\u00e4llkod<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vasexperts\/blog\/433298\/\">N\u00e4tverksdaiigest: 17 expertrapporter om Wi-Fi och 5G<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>\nEnligt OpenPGP-specifikationen kan vem som helst l\u00e4gga till digitala signaturer p\u00e5 certifikat f\u00f6r att verifiera deras \u00e4gare. Det finns ingen \u00f6vre gr\u00e4ns f\u00f6r antalet signaturer. H\u00e4r uppst\u00e5r problemet \u2014 SKS-n\u00e4tverket till\u00e5ter att lagra upp till 150 000 signaturer p\u00e5 ett certifikat, men GnuPG kan inte hantera s\u00e5 m\u00e5nga. D\u00e4rf\u00f6r h\u00e4nger GnuPG (och andra implementationer av OpenPGP) n\u00e4r certifikatet laddas ner.<\/p>\n<p>En av anv\u00e4ndarna <noindex><a rel=\"nofollow\" href=\"https:\/\/buttondown.email\/cryptography-dispatches\/archive\/cryptography-dispatches-hello-world-and-openpgp\/\">genomf\u00f6rde ett experiment<\/a><\/noindex> \u2014 importen av certifikatet tog honom ungef\u00e4r 10 minuter. Certifikatet hade \u00f6ver 54 000 signaturer och v\u00e4gde 17 megabyte:<\/p>\n<pre><code class=\"bash\">$ gpg --homedir=$PWD --recv C4BC2DDB38CCE96485EBE9C2F20691179038E5C6\ngpg: key F20691179038E5C6: 4 duplicerade signaturer borttagna\ngpg: key F20691179038E5C6: 54614 signaturer som inte kontrollerades p\u00e5 grund av saknade nycklar\ngpg: key F20691179038E5C6: 4 signaturer omordnade\ngpg: key F20691179038E5C6: offentlig nyckel \"Daniel Kahn Gillmor \" importerad\ngpg: inga slutgiltigt betrodda nycklar hittades\ngpg: Totalt antal behandlade: 1\ngpg:               importerad: 1\n$ ls -lh pubring.gpg\n-rw-r--r--  1 filippo  staff    17M  2 Jul 16:30 pubring.gpg\n<\/code><\/pre>\n<p>\nSituationen f\u00f6rv\u00e4rras av att OpenPGP-nyckelservrar inte tar bort information om certifikat. Detta g\u00f6rs f\u00f6r att sp\u00e5ra kedjan av alla \u00e5tg\u00e4rder med certifikaten och f\u00f6r att f\u00f6rhindra deras manipulation. D\u00e4rf\u00f6r kan komprometterade element inte tas bort.<\/p>\n<p>I grunden \u00e4r SKS-n\u00e4tverket en stor \"filserver\" d\u00e4r vem som helst kan lagra data. F\u00f6r att illustrera problemet skapade en resident p\u00e5 GitHub f\u00f6rra \u00e5ret <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/yakamok\/keyserver-fs\">ett filsystem<\/a><\/noindex>, som lagrar dokument i n\u00e4tverket av kryptografiska nyckelservrar.<\/p>\n<h2>Varf\u00f6r \u00e5tg\u00e4rdade de inte s\u00e5rbarheten<\/h2>\n<p>\nDet fanns ingen anledning att \u00e5tg\u00e4rda s\u00e5rbarheten. Den hade tidigare inte anv\u00e4nts f\u00f6r att utf\u00f6ra hackerattacker. Fast IT-gemenskapen <noindex><a rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=20315633\">har l\u00e4nge bett<\/a><\/noindex> utvecklarna av SKS och OpenPGP att uppm\u00e4rksamma problemet.<\/p>\n<p>F\u00f6r r\u00e4ttvisans skull b\u00f6r det n\u00e4mnas att de dock i juni <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news#2019-06-12-launch\">startade<\/a><\/noindex> en experimentell nyckelserver <noindex><a rel=\"nofollow\" href=\"https:\/\/keys.openpgp.org\/about\/news\">keys.openpgp.org<\/a><\/noindex>. Den har skydd mot s\u00e5dana typer av attacker. Men dess databas fylls p\u00e5 fr\u00e5n grunden, och servern \u00e4r inte en del av SKS. S\u00e5 det kommer ta tid innan den kan anv\u00e4ndas.<\/p>\n<p><img decoding=\"async\" alt=\"Postanalys: vad vet vi om den senaste attacken mot n\u00e4tverket av kryptonycklar 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>N\u00e4r det g\u00e4ller buggen i det ursprungliga systemet hindrar en komplex synkroniseringsmekanism fr\u00e5n att \u00e5tg\u00e4rda den. N\u00e4tverket av nyckelservrar skapades ursprungligen som proof of concept f\u00f6r att skydda Yaron Minsky's doktorsavhandling. Ett ganska specifikt spr\u00e5k, OCaml, valdes f\u00f6r arbetet. Enligt <noindex><a rel=\"nofollow\" href=\"https:\/\/gist.github.com\/rjhansen\/67ab921ffb4084c865b3618d6955275f\">ord<\/a><\/noindex> maintainer Robert Hansen \u00e4r det sv\u00e5rt att f\u00f6rst\u00e5 koden, d\u00e4rf\u00f6r g\u00f6rs bara sm\u00e5 korrigeringar. F\u00f6r att \u00e4ndra SKS-arkitekturen m\u00e5ste den skrivas om fr\u00e5n grunden.<\/p>\n<p>I vilket fall som helst tror ingen p\u00e5 GnuPG att n\u00e4tverket n\u00e5gonsin kommer att kunna \u00e5tg\u00e4rdas. I ett inl\u00e4gg p\u00e5 GitHub skrev utvecklarna till och med att de inte rekommenderar att arbeta med SKS Keyserver. Egendomligen \u00e4r detta en av huvudorsakerna till att de initierade \u00f6verg\u00e5ngen till den nya tj\u00e4nsten keys.openpgp.org. Vi kan bara bevaka den fortsatta utvecklingen.<\/p>\n<blockquote><p><b>N\u00e5gra material fr\u00e5n v\u00e5r f\u00f6retagsblogg:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/botnet-spamit-cherez-routery\/\">Botneten \"spammar\" via routrar: vad du beh\u00f6ver veta<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/vasexperts.ru\/blog\/bezopasnost\/ddos-i-5g-tolshhe-truba-bolshe-problem\/\">DDoS och 5G: tjockare \"r\u00f6r\" \u2014 fler problem<\/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 skyddsverktyg f\u00f6r olika \u00e4ndam\u00e5l<\/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 byn \u2013 vi bygger ett radiol\u00e4nk Wi-Fi-n\u00e4tverk<\/a><\/noindex><\/li>\n<\/ul>\n<\/blockquote>\n<p>K\u00e4lla: <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 5.0.4 - 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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