{"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\/ro\/blog\/news\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","title":{"rendered":"Vulnerabilit\u0103\u021bi \u00een networkd-dispatcher, care permit ob\u021binerea drepturilor de root.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Cercet\u0103torii de securitate de la Microsoft au descoperit dou\u0103 vulnerabilit\u0103\u021bi (CVE-2022-29799, CVE-2022-29800) \u00een serviciul networkd-dispatcher, numite Nimbuspwn, care permit unui utilizator f\u0103r\u0103 privilegii s\u0103 execute comenzi arbitrare cu drepturi de root. Problema a fost rezolvat\u0103 \u00een versiunea networkd-dispatcher 2.2. Nu exist\u0103 informa\u021bii despre publicarea actualiz\u0103rilor de c\u0103tre distribu\u021bii \u00een acest moment (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux).      <\/p>\n<p>Networkd-dispatcher este utilizat \u00een multe distribu\u021bii Linux, inclusiv Ubuntu, care folose\u0219te un proces de fundal systemd-networkd pentru configurarea parametrilor de re\u021bea \u0219i \u00eendepline\u0219te func\u021bii similare cu NetworkManager-dispatcher, adic\u0103 se ocup\u0103 de rularea scripturilor atunci c\u00e2nd starea conexiunii de re\u021bea se schimb\u0103, de exemplu, este folosit pentru a porni <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"206\">VPN<\/a> dup\u0103 stabilirea conexiunii de re\u021bea principale.     <\/p>\n<p>Procesul de fundal legat de networkd-dispatcher ruleaz\u0103 cu drepturi de root \u0219i prime\u0219te semnale despre evenimente prin intermediul magistralei D-Bus. Informa\u021biile despre evenimentele legate de schimbarea st\u0103rii conexiunilor de re\u021bea sunt trimise de serviciul systemd-networkd. Problema este c\u0103 utilizatorii f\u0103r\u0103 privilegii pot genera un eveniment pentru o stare inexistent\u0103 \u0219i ini\u021bia rularea propriului script, care va fi executat cu drepturi de root.     <\/p>\n<p>Systemd-networkd este proiectat s\u0103 ruleze doar scripturi de sistem, plasate \u00een directorul \/etc\/networkd-dispatcher, care nu sunt accesibile utilizatorului pentru a fi \u00eenlocuite. Cu toate acestea, din cauza unei vulnerabilit\u0103\u021bi (CVE-2022-29799) \u00een codul de procesare a c\u0103ilor de fi\u0219ier, a existat posibilitatea de a ie\u0219i din directorul de baz\u0103 \u0219i de a rula scripturi arbitrare. \u00cen special, \u00een construirea c\u0103ii c\u0103tre script, au fost utilizate valorile OperationalState \u0219i AdministrativeState transmise prin D-Bus, care nu au fost cur\u0103\u021bate de caractere speciale. Un atacator putea genera un stat personalizat, a c\u0103rui denumire con\u021binea caracterele \"..\/\" \u0219i \u00eendrepta apelul c\u0103tre networkd-dispatcher c\u0103tre un alt director.    <\/p>\n<p>A doua vulnerabilitate (CVE-2022-29800) este legat\u0103 de o stare de concuren\u021b\u0103 \u2014 \u00eentre verificarea parametrilor scriptului (apartenen\u021ba la root) \u0219i rularea acestuia, exista un mic interval de timp suficient pentru a \u00eenlocui fi\u0219ierul \u0219i a ocoli verificarea apartenen\u021bei scriptului utilizatorului root. \u00cen plus, \u00een networkd-dispatcher nu exista o verificare a leg\u0103turilor simbolice, \u00een special atunci c\u00e2nd rulau scripturi prin apelul subprocess.Popen, ceea ce a simplificat considerabil organizarea atacului.      <\/p>\n<p>Tehnica de exploatare:  <\/p>\n<ul>\n<li class=\"l\"> Se creeaz\u0103 directorul \"tmp\/nimbuspwn\" \u0219i o leg\u0103tur\u0103 simbolic\u0103 \"tmp\/nimbuspwn\/poc.d\", care face referire la directorul \"\/sbin\", care este utilizat pentru a trece verificarea existen\u021bei fi\u0219ierelor executabile apar\u021bin\u00e2nd root.\n<li class=\"l\"> Pentru fi\u0219ierele executabile din \"\/sbin\" se creeaz\u0103 fi\u0219iere cu acela\u0219i nume \u00een directorul \"tmp\/nimbuspwn\", de exemplu, pentru fi\u0219ierul \"\/sbin\/vgs\" se creeaz\u0103 un fi\u0219ier executabil \"tmp\/nimbuspwn\/vgs\", care apar\u021bine unui utilizator neprivilegiat, \u00een care se introduce codul pe care atacatorul dore\u0219te s\u0103-l ruleze.\n<li class=\"l\"> Prin D-Bus, procesul networkd-dispatcher prime\u0219te un semnal care specific\u0103 \u00een OperationalState valoarea \"..\/..\/..\/tmp\/nimbuspwn\/poc\". Pentru a trimite semnalul \u00een spa\u021biul de nume \"org.freedesktop.network1\" a fost folosit\u0103 capacitatea de a conecta propriile handler-e la systemd-networkd, de exemplu, prin manevre cu gpgv sau epmd, sau se poate profita de faptul c\u0103 systemd-networkd nu este pornit \u00een mod implicit (de exemplu, \u00een Linux Mint).\n<li class=\"l\"> Dup\u0103 primirea semnalului, Networkd-dispatcher efectueaz\u0103 o construc\u021bie a listei de fi\u0219iere executabile apar\u021bin\u00e2nd utilizatorului root \u0219i disponibile \u00een directorul \"etc\/networkd-dispatcher\/..\/..\/..\/tmp\/nimbuspwn\/poc.d\", care de fapt face referire la \"\/sbin\".\n<li class=\"l\"> \u00cen momentul \u00een care lista de fi\u0219iere a fost ob\u021binut\u0103, dar scriptul nu a fost \u00eenc\u0103 pornit, leg\u0103tura simbolic\u0103 este redirec\u021bionat\u0103 de la &#171;\\\/tmp\\\/nimbuspwn\\\/poc.d&#187; la &#171;\\\/tmp\\\/nimbuspwn&#187; \u0219i networkd-dispatcher va rula cu privilegii de root scriptul plasat de atacator.        <\/ul>\n<p>    <center><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi \u00een networkd-dispatcher, care permit ob\u021binerea drepturilor de root.\" src=\"\/wp-content\/uploads\/2022\/04\/15109315e192eb6384601dfafc436775.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57093\">opennet.ro<\/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 5.0.4 - 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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dou\u0103 vulnerabilit\u0103\u021bi (CVE-2022-29799, CVE-2022-29800) \u00een serviciul networkd-dispatcher, denumite cod \u201eNimbuspwn\u201d \u0219i care permit unui utilizator neprivilegiat.","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 networkd-dispatcher, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 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