{"id":103885,"date":"2022-04-27T15:36:48","date_gmt":"2022-04-27T13:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root"},"modified":"2022-04-27T15:36:48","modified_gmt":"2022-04-27T13:36:49","slug":"uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","title":{"rendered":"Luki w networkd-dispatcher, kt\u00f3re pozwalaj\u0105 na uzyskanie uprawnie\u0144 roota","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Badacze ds. bezpiecze\u0144stwa z firmy Microsoft zidentyfikowali dwie podatno\u015bci (CVE-2022-29799, CVE-2022-29800) w us\u0142udze networkd-dispatcher, kt\u00f3re otrzyma\u0142y nazw\u0119 kodow\u0105 Nimbuspwn i umo\u017cliwiaj\u0105 nieuprzywilejowanemu u\u017cytkownikowi wykonanie dowolnych polece\u0144 z prawami root. Problem zosta\u0142 rozwi\u0105zany w wersji networkd-dispatcher 2.2. Na razie brak informacji o publikacji aktualizacji przez dystrybucje (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux).      <\/p>\n<p>Networkd-dispatcher jest u\u017cywany w wielu dystrybucjach Linuxa, w tym w Ubuntu, kt\u00f3re korzystaj\u0105 z procesu w tle systemd-networkd do konfiguracji parametr\u00f3w sieci, i pe\u0142ni funkcje zbli\u017cone do NetworkManager-dispatcher, czyli uruchamia skrypty w przypadku zmiany stanu po\u0142\u0105czenia sieciowego, na przyk\u0142ad jest u\u017cywany do uruchamiania <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"206\">VPN<\/a> po nawi\u0105zaniu podstawowego po\u0142\u0105czenia sieciowego.     <\/p>\n<p>Powi\u0105zany z networkd-dispatcher proces w tle dzia\u0142a z prawami root i odbiera sygna\u0142y o zdarzeniach przez szyn\u0119 D-Bus. Informacje o zdarzeniach zwi\u0105zanych ze zmian\u0105 stanu po\u0142\u0105cze\u0144 sieciowych s\u0105 przesy\u0142ane przez us\u0142ug\u0119 systemd-networkd. Problem polega na tym, \u017ce nieuprzywilejowani u\u017cytkownicy mog\u0105 stworzy\u0107 zdarzenie o nieistniej\u0105cym stanie i zainicjowa\u0107 uruchomienie swojego skryptu, kt\u00f3ry zostanie wykonany z prawami root.     <\/p>\n<p>Systemd-networkd jest zaprojektowany do uruchamiania tylko systemowych skrypt\u00f3w obs\u0142ugi znajduj\u0105cych si\u0119 w katalogu \/etc\/networkd-dispatcher, kt\u00f3re nie s\u0105 dost\u0119pne do zast\u0105pienia przez u\u017cytkownika, ale z powodu luki (CVE-2022-29799) w kodzie przetwarzania \u015bcie\u017cek plik\u00f3w istnia\u0142a mo\u017cliwo\u015b\u0107 wyj\u015bcia poza podstawowy katalog i uruchomienia dowolnych skrypt\u00f3w. W szczeg\u00f3lno\u015bci, podczas tworzenia \u015bcie\u017cki do skryptu u\u017cywano warto\u015bci OperationalState i AdministrativeState przekazywanych przez D-Bus, w kt\u00f3rych nie miano oczyszczenia specjalnych znak\u00f3w. Atakuj\u0105cy m\u00f3g\u0142 wygenerowa\u0107 w\u0142asny stan, w nazwie kt\u00f3rego znajdowa\u0142y si\u0119 znaki \u201e..\/\u201d i przekierowa\u0107 wywo\u0142anie networkd-dispatchera do innego katalogu.    <\/p>\n<p>Druga luka (CVE-2022-29800) dotyczy stanu wy\u015bcigu \u2014 mi\u0119dzy sprawdzeniem parametr\u00f3w skryptu (nale\u017cno\u015b\u0107 do roota) a jego uruchomieniem istnia\u0142 kr\u00f3tki czas, wystarczaj\u0105cy do zamiany pliku i omini\u0119cia sprawdzenia przynale\u017cno\u015bci skryptu do u\u017cytkownika root. Ponadto, w networkd-dispatcher brakowa\u0142o sprawdzenia na dowi\u0105zania symboliczne, w tym podczas uruchamiania skrypt\u00f3w za pomoc\u0105 wywo\u0142ania subprocess.Popen, co znacznie u\u0142atwi\u0142o przeprowadzenie ataku.      <\/p>\n<p>Techniki eksploatacji:  <\/p>\n<ul>\n<li class=\"l\"> Tworzy si\u0119 katalog \u201e\/tmp\/nimbuspwn\u201d oraz dowi\u0105zanie symboliczne \u201e\/tmp\/nimbuspwn\/poc.d\u201d, wskazuj\u0105ce na katalog \u201e\/sbin\u201d, kt\u00f3ry jest u\u017cywany do przechodzenia sprawdzenia, czy pliki wykonywalne nale\u017c\u0105 do roota.\n<li class=\"l\"> Dla plik\u00f3w wykonywalnych z \u201e\/sbin\u201d tworzone s\u0105 pliki o podobnej nazwie w katalogu \u201e\/tmp\/nimbuspwn\u201d, na przyk\u0142ad dla pliku \u201e\/sbin\/vgs\u201d tworzy si\u0119 plik wykonywalny \u201e\/tmp\/nimbuspwn\/vgs\u201d, nale\u017c\u0105cy do u\u017cytkownika bez uprawnie\u0144, do kt\u00f3rego umieszczany jest kod, kt\u00f3ry chce uruchomi\u0107 atakuj\u0105cy.\n<li class=\"l\"> Przez D-Bus do procesu networkd-dispatchera wysy\u0142any jest sygna\u0142 z warto\u015bci\u0105 \u201e..\/....\/tmp\/nimbuspwn\/poc\u201d w OperationalState. Do wysy\u0142ania sygna\u0142u w przestrzeni nazw \u201eorg.freedesktop.network1\u201d wykorzystano mo\u017cliwo\u015b\u0107 pod\u0142\u0105czenia w\u0142asnych obs\u0142ugiwaczy do systemd-networkd, na przyk\u0142ad poprzez manipulacj\u0119 z gpgv lub epmd, lub mo\u017cna skorzysta\u0107 z faktu, \u017ce systemd-networkd nie jest uruchomiony domy\u015blnie (na przyk\u0142ad w Linux Mint).\n<li class=\"l\"> Po odebraniu sygna\u0142u Networkd-dispatcher buduje list\u0119 plik\u00f3w wykonywalnych, nale\u017c\u0105cych do u\u017cytkownika root i dost\u0119pnych w katalogu \u201e\/etc\/networkd-dispatcher\/..\/..\/..\/tmp\/nimbuspwn\/poc.d\u201d, kt\u00f3ry w rzeczywisto\u015bci wskazuje na \u201e\/sbin\u201d.\n<li class=\"l\"> W momencie, gdy lista plik\u00f3w zosta\u0142a uzyskana, ale skrypt jeszcze nie zosta\u0142 uruchomiony, dowi\u0105zanie symboliczne jest przekierowywane z &#171;\\\/tmp\\\/nimbuspwn\\\/poc.d&#187; na &#171;\\\/tmp\\\/nimbuspwn&#187;, a networkd-dispatcher uruchomi skrypt zamieszczony przez atakuj\u0105cego z uprawnieniami roota.        <\/ul>\n<p>    <center><img decoding=\"async\" alt=\"Luki w networkd-dispatcher, kt\u00f3re pozwalaj\u0105 na uzyskanie uprawnie\u0144 roota\" src=\"\/wp-content\/uploads\/2022\/04\/15109315e192eb6384601dfafc436775.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57093\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Microsoft \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-29799, CVE-2022-29800) \u0432 \u0441\u0435\u0440\u0432\u0438\u0441\u0435 networkd-dispatcher, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0435 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Nimbuspwn \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \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 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 networkd-dispatcher 2.2. \u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u043c\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435\u0442 (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux). Networkd-dispatcher \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Linux, \u0432\u043a\u043b\u044e\u0447\u0430\u044f Ubuntu, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103886,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103885","post","type-post","status-publish","format-standard","has-post-thumbnail","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=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 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