{"id":41582,"date":"2020-02-12T16:19:30","date_gmt":"2020-02-12T13:19:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2020-02-12T16:19:30","modified_gmt":"2020-02-12T13:19:30","slug":"uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Viga systemd, mis v\u00f5imaldab potentsiaalselt \u00f5iguste t\u00f5stmist","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

S\u00fcsteemihalduri systemd tuvastatud<\/a><\/noindex> haavatavus (CVE-2020-1712<\/a><\/noindex>), mis v\u00f5imaldab potentsiaalselt k\u00e4ivitada oma koodi suurendatud \u00f5igustega, saates spetsiaalselt vormindatud p\u00e4ringu DBus bussile. Probleem on parandatud testversioonis systemd 245-rc1<\/a><\/noindex> (probleemi lahendavad plaastrid: 1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>). Haavatavus on k\u00f5rvaldatud distributsioonides Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, RHEL<\/a><\/noindex> (ilmneb RHEL 8-s, kuid ei m\u00f5juta RHEL 7-d), CentOS<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex> ja ROSA<\/a><\/noindex>, kuid uudise kirjutamise hetkel on see veel parandamata Debian<\/a><\/noindex> ja Arch Linuxis<\/a><\/noindex>. <\/p>\n

Haavatavus on p\u00f5hjustatud juba vabastatud m\u00e4luala (use-after-free) k\u00e4sitlemisest, mis tekib as\u00fcnkroonsete p\u00e4ringute tegemisel Polkitile DBus s\u00f5numite t\u00f6\u00f6tlemise ajal. M\u00f5ned DBus liideseed kasutavad objektide l\u00fchiajalist vahem\u00e4lu, puhastades vahem\u00e4lu elemendid, kui DBus buss on vaba teiste p\u00e4ringute t\u00f6\u00f6tlemiseks. Kui DBus meetodi k\u00e4itleja kasutab bus_verify_polkit_async(), v\u00f5ib tal olla vajalik oodata Polkit'i toimingute l\u00f5ppemist. Polkit'i valmimisel kutsutakse k\u00e4itlejat uuesti ja see p\u00f6\u00f6rdub juba varem eraldatud m\u00e4ludetailide poole. Kui p\u00e4ring Polkitile kestab liiga kaua, siis on vahem\u00e4lu elemendid piisavalt aega, et enne meetodi uuesti kutsumist puhastuda. <\/p>\n

Voodsidest, mis v\u00f5imaldavad haavatavuse \u00e4rakasutamist, on v\u00e4lja toodud systemd-machined, mis pakub DBus API-d org.freedesktop.machine1.Image.Clone, mis viib andmete ajutise salvestamiseni vahem\u00e4lus ja as\u00fcnkroonsete p\u00e4ringute tegemiseni Polkitile. Liides
\norg.freedesktop.machine1.Image.Clone on saadaval k\u00f5igile s\u00fcsteemi mitteprivilegeeritud kasutajatele, kes v\u00f5ivad algatada systemd teenuste krahhi v\u00f5i potentsiaalselt saavutada koodi t\u00e4itmise root \u00f5igustes (kavandi kuritarvitamise protot\u00fc\u00fcp pole veel demonstreeritud). Kood, mis v\u00f5imaldab haavatavuse \u00e4rakasutamist, oli lisatud<\/a><\/noindex> systemd-machinedis 2015. aastal versioonis systemd 220<\/a><\/noindex> (RHEL 7.x kasutab systemd 219). <\/p>\n

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

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

\u0412 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 systemd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-1712), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u044f\u043c\u0438 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043f\u043e \u0448\u0438\u043d\u0435 DBus. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0430 \u0432 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 systemd 245-rc1 (\u0440\u0435\u0448\u0430\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043f\u0430\u0442\u0447\u0438: 1, 2, 3). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Ubuntu, Fedora, RHEL (\u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 RHEL 8, \u043d\u043e \u043d\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 RHEL 7), CentOS, […]<\/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":[],"tags":[],"class_list":["post-41582","post","type-post","status-publish","format-standard","hentry"],"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\udd47 Haavatavus systemd-s, mis v\u00f5ib v\u00f5imaldada privilegeeritud \u00f5iguste t\u00f5stmist | ProHoster","description":"s\u00fcsteemi halduris systemd on avastatud haavatavus (CVE-2020-1712), mis potentsiaalselt v\u00f5imaldab koodi t\u00e4itmist k\u00f5rgendatud \u00f5igustega, saates eriliselt loodud p\u00e4ringu DBusi bussile. Probleem on parandatud systemd 245-rc1 prooviversioonis (probleemi lahendavad pat\u0161id: 1, 2, 3). 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\u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster","og:description":"\u0412 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 systemd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-1712), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u044f\u043c\u0438 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043f\u043e \u0448\u0438\u043d\u0435 DBus. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0430 \u0432 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 systemd 245-rc1 (\u0440\u0435\u0448\u0430\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043f\u0430\u0442\u0447\u0438: 1, 2, 3). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Ubuntu, Fedora, RHEL (\u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 RHEL 8, \u043d\u043e \u043d\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 RHEL 7), 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