{"id":104289,"date":"2022-06-06T09:36:38","date_gmt":"2022-06-06T07:36:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/eshhyo-odna-uyazvimost-v-podsisteme-yadra-linux-netfilter"},"modified":"2022-06-06T09:36:38","modified_gmt":"2022-06-06T07:36:38","slug":"eshhyo-odna-uyazvimost-v-podsisteme-yadra-linux-netfilter","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/eshhyo-odna-uyazvimost-v-podsisteme-yadra-linux-netfilter","title":{"rendered":"Jeszcze jedna luka w podsystemie j\u0105dra Linux Netfilter","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>W podsystemie j\u0105dra Netfilter ujawniono luk\u0119 (CVE-2022-1972), podobn\u0105 do problemu ujawnionego pod koniec maja. Nowa luka pozwala lokalnemu u\u017cytkownikowi uzyska\u0107 uprawnienia roota w systemie poprzez manipulacj\u0119 zasadami w nftables i wymaga dost\u0119pu do nftables, kt\u00f3ry mo\u017cna uzyska\u0107 w osobnej przestrzeni nazw (network namespace lub user namespace) przy posiadaniu uprawnie\u0144 CLONE_NEWUSER, CLONE_NEWNS lub CLONE_NEWNET (na przyk\u0142ad w przypadku mo\u017cliwo\u015bci uruchomienia izolowanego kontenera).     <\/p>\n<p>Problem wynika z b\u0142\u0119du w kodzie obs\u0142uguj\u0105cym listy set z polami obejmuj\u0105cymi wiele zakres\u00f3w, co prowadzi do zapisu poza przydzielonym obszarem pami\u0119ci podczas przetwarzania specjalnie sformatowanych parametr\u00f3w listy. Naukowcom uda\u0142o si\u0119 przygotowa\u0107 dzia\u0142aj\u0105cy exploit do uzyskania uprawnie\u0144 root w Ubuntu 21.10 z j\u0105drem 5.13.0-39-generic. Luka w zabezpieczeniach wyst\u0119puje od j\u0105dra 5.6. Poprawka zosta\u0142a zaproponowana w postaci \u0142aty. Aby zablokowa\u0107 wykorzystanie tej luki w normalnych systemach, nale\u017cy upewni\u0107 si\u0119, \u017ce wy\u0142\u0105czona jest mo\u017cliwo\u015b\u0107 tworzenia przestrzeni nazw przez u\u017cytkownik\u00f3w bez uprawnie\u0144 (&#171;sudo sysctl -w kernel.unprivileged_userns_clone=0&#187;).    <\/p>\n<p>Ponadto opublikowano informacje o trzech lukach w j\u0105drze zwi\u0105zanych z podsystemem NFC. Luki te umo\u017cliwiaj\u0105 awaryjne zako\u0144czenie pracy poprzez wykonanie dzia\u0142a\u0144 przez u\u017cytkownika bez uprawnie\u0144 (bardziej niebezpieczne wektory ataku jak dot\u0105d nie zosta\u0142y zademonstrowane):  <\/p>\n<ul>\n<li class=\"l\"> CVE-2022-1734 &#8212; dost\u0119p do ju\u017c zwolnionej pami\u0119ci (use-after-free) w sterowniku nfcmrvl (drivers\/nfc\/nfcmrvl), kt\u00f3ry wyst\u0119puje podczas symulacji urz\u0105dzenia NFC w przestrzeni u\u017cytkownika.\n<li class=\"l\"> CVE-2022-1974 &#8212; dost\u0119p do ju\u017c zwolnionej pami\u0119ci w funkcjach netlink dla urz\u0105dze\u0144 NFC (&#047;net&#047;nfc&#047;core.c), kt\u00f3ry wyst\u0119puje podczas rejestracji nowego urz\u0105dzenia. Podobnie jak w poprzedniej luce, problem mo\u017cna wykorzysta\u0107 poprzez symulacj\u0119 urz\u0105dzenia NFC w przestrzeni u\u017cytkownika.\n<li class=\"l\"> CVE-2022-1975 &#8212; b\u0142\u0105d w kodzie \u0142adowania oprogramowania uk\u0142adowego dla urz\u0105dze\u0144 NFC, kt\u00f3ry mo\u017cna wykorzysta\u0107 do wywo\u0142ania stanu &#171;panic&#187;.    <\/ul>\n<p>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57305\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Netfilter \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-1972), \u043f\u043e\u0445\u043e\u0436\u0430\u044f \u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u0443\u044e \u0432 \u043a\u043e\u043d\u0446\u0435 \u043c\u0430\u044f. \u041d\u043e\u0432\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 \u043f\u0440\u0430\u0432\u0438\u043b\u0430\u043c\u0438 \u0432 nftables \u0438 \u0442\u0440\u0435\u0431\u0443\u0435\u0442 \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a nftables, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u043c \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u0438\u043c\u0451\u043d (network namespace \u0438\u043b\u0438 user namespace) \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043f\u0440\u0430\u0432 CLONE_NEWUSER, [&hellip;]<\/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-104289","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 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