{"id":92097,"date":"2020-08-22T19:42:16","date_gmt":"2020-08-22T17:42:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-chrony"},"modified":"2020-08-22T19:42:16","modified_gmt":"2020-08-22T17:42:16","slug":"uyazvimost-v-chrony","status":"publish","type":"post","link":"https:\/\/prohoster.info\/lv\/blog\/news\/uyazvimost-v-chrony","title":{"rendered":"Vainojam\u012bba chrony","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No chrony<\/a><\/noindex>, realiz\u0113jot NTP protokolu, kas tiek izmantots prec\u012bza laika sinhroniz\u0101cijai da\u017e\u0101dos Linux izplat\u012bjumos, identified<\/a><\/noindex> vaina (CVE-2020-14367<\/a><\/noindex>), \u013caujot p\u0101rrakst\u012bt jebkuru failu sist\u0113m\u0101, ja ir piek\u013cuve lok\u0101lajam nep\u0101rvald\u012btajam lietot\u0101jam chrony. \u0160o ievainojam\u012bbu var izmantot tikai, izmantojot chrony lietot\u0101ju, kas samazina t\u0101s b\u012bstam\u012bbu. Tom\u0113r probl\u0113ma apdraud izol\u0101cijas l\u012bmeni chrony un to var izmantot, ja tiek konstat\u0113ta cita ievainojam\u012bba kod\u0101, kas tiek izpild\u012bts p\u0113c privil\u0113\u0123iju atjauno\u0161anas.<\/p>\n

Ievainojam\u012bba ir radusies dro\u0161\u012bbas nepiln\u012bbu d\u0113\u013c, veidojot pid failu, kas tika izveidots br\u012bd\u012b, kad chrony v\u0113l nebija atjaunojusi privil\u0113\u0123ijas un darboj\u0101s ar root ties\u012bb\u0101m. \u0160aj\u0101 gad\u012bjum\u0101 katalogs \/run\/chrony, kur\u0101 tiek ierakst\u012bts pid fails, tika izveidots ar 0750 ties\u012bb\u0101m, izmantojot systemd-tmpfiles vai palai\u017eot chronyd ar piesaist\u012btu lietot\u0101ju un grupu \u201echrony\u201d. T\u0101d\u0113j\u0101di, ja ir piek\u013cuve chrony lietot\u0101jam, ir iesp\u0113jams aizst\u0101t pid failu \/run\/chrony\/chronyd.pid ar simbolisko saiti. Simbolisk\u0101 saite var nor\u0101d\u012bt uz jebkuru sist\u0113mas failu, kas tiks p\u0101rrakst\u012bts chronyd palai\u0161anas br\u012bd\u012b.<\/p>\n

root# systemctl stop chronyd.service
\n root# sudo -u chrony \/bin\/bash<\/p>\n

chrony$ cd \/run\/chrony
\n chrony$ ln -s \/etc\/shadow chronyd.pid
\n chrony$ exit<\/p>\n

root# \/usr\/sbin\/chronyd -n
\n ^C
\n # \u0432\u043c\u0435\u0441\u0442\u043e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \/etc\/shadow \u0431\u0443\u0434\u0435\u0442 \u0441\u043e\u0445\u0440\u0430\u043d\u0451\u043d \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 chronyd
\n root# cat \/etc\/shadow
\n 15287<\/p>\n

Ievainojam\u012bba ir nov\u0113rsta<\/a><\/noindex> izlaidum\u0101 chrony 3.5.1<\/a><\/noindex>. Pakot\u0146u atjaunin\u0101jumi ar ievainojam\u012bbas nov\u0113r\u0161anu ir pieejami Fedora<\/a><\/noindex>. Gatavojot atjaunin\u0101jumu RHEL<\/a><\/noindex>, Debian<\/a><\/noindex> un Ubuntu<\/a><\/noindex>.<\/p>\n

SUSE un openSUSE probl\u0113mai are not affected<\/a><\/noindex>, jo simbolisk\u0101 saite chrony tiek izveidota tie\u0161i katalog\u0101 \/run, neizmantojot papildu apak\u0161katalogus. <\/p>\n

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

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

\u0412 chrony, \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 NTP, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0442\u043e\u0447\u043d\u043e\u0433\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Linux, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-14367), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043b\u044e\u0431\u043e\u0439 \u0444\u0430\u0439\u043b \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0438\u043c\u0435\u044f \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e chrony. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0447\u0435\u0440\u0435\u0437 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f chrony, \u0447\u0442\u043e \u0441\u043d\u0438\u0436\u0430\u0435\u0442 \u0435\u0451 \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u0443\u0435\u0442 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438 \u0432 chrony \u0438 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0432 […]<\/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":[702],"tags":[],"class_list":["post-92097","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilit\u0101te chrony | ProHoster","description":"Chrony, NTP protokola realiz\u0101cija, kas tiek izmantota prec\u012bza laika sinhroniz\u0113\u0161anai da\u017e\u0101dos Linux 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