{"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\/it\/blog\/novosti-interneta\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","title":{"rendered":"Vulnerabilit\u00e0 in networkd-dispatcher che consentono di ottenere diritti di root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori di sicurezza di Microsoft hanno identificato due vulnerabilit\u00e0 (CVE-2022-29799, CVE-2022-29800) nel servizio networkd-dispatcher, soprannominate Nimbuspwn, che consentono a un utente non privilegiato di eseguire comandi arbitrari con diritti di root. Il problema \u00e8 stato risolto nella versione 2.2 di networkd-dispatcher. Non ci sono ancora informazioni sulla pubblicazione degli aggiornamenti da parte delle distribuzioni (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux).      <\/p>\n<p>Networkd-dispatcher \u00e8 utilizzato in molte distribuzioni Linux, compreso Ubuntu, che utilizza il processo in background systemd-networkd per configurare le impostazioni di rete, e svolge funzioni simili a quelle di NetworkManager-dispatcher, ovvero esegue script quando cambia lo stato della connessione di rete, ad esempio, viene utilizzato per avviare <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"206\">VPN<\/a> dopo l'installazione della connessione di rete principale.     <\/p>\n<p>Un processo in background associato a networkd-dispatcher viene eseguito con privilegi di root e riceve segnali di eventi tramite il bus D-Bus. Le informazioni sugli eventi legati al cambiamento dello stato delle connessioni di rete vengono inviate dal servizio systemd-networkd. Il problema \u00e8 che gli utenti non privilegiati possono generare un evento per uno stato inesistente e avviare uno script che verr\u00e0 eseguito con privilegi di root.     <\/p>\n<p>Systemd-networkd \u00e8 progettato per eseguire solo script di gestione di sistema memorizzati nella directory \/etc\/networkd-dispatcher, non sostituibili dall'utente. Tuttavia, a causa di una vulnerabilit\u00e0 (CVE-2022-29799) nel codice di gestione dei percorsi dei file, c'era la possibilit\u00e0 di andare oltre la directory di base e lanciare script arbitri. In particolare, la generazione del percorso del file per lo script utilizzava i valori OperationalState e AdministrativeState passati tramite D-Bus, nei quali non venivano ripuliti i caratteri speciali. Un attaccante poteva generare un proprio stato, il cui nome conteneva caratteri \u00ab..\/\u00bb e reindirizzare la chiamata a networkd-dispatcher in un'altra directory.    <\/p>\n<p>La seconda vulnerabilit\u00e0 (CVE-2022-29800) riguarda una condizione di gara: c'era un breve intervallo di tempo tra il controllo dei parametri dello script (appartenenza a root) e la sua esecuzione, sufficiente per sostituire il file e aggirare il controllo di appartenenza dello script all'utente root. Inoltre, in networkd-dispatcher mancava un controllo sulle link simboliche, anche durante l'esecuzione degli script tramite la chiamata subprocess.Popen, il che ha semplificato notevolmente l'organizzazione dell'attacco.      <\/p>\n<p>Tecnica di sfruttamento:  <\/p>\n<ul>\n<li class=\"l\"> Viene creato il catalogo \u00ab\/tmp\/nimbuspwn\u00bb e un collegamento simbolico \u00ab\/tmp\/nimbuspwn\/poc.d\u00bb, che punta al catalogo \u00ab\/sbin\u00bb, utilizzato per il controllo della presenza di file eseguibili appartenenti a root.\n<li class=\"l\"> Per i file eseguibili presenti in \u00ab\/sbin\u00bb vengono creati file con nomi analoghi nel catalogo \u00ab\/tmp\/nimbuspwn\u00bb, ad esempio, per il file \u00ab\/sbin\/vgs\u00bb viene creato un file eseguibile \u00ab\/tmp\/nimbuspwn\/vgs\u00bb, appartenente a un utente non privilegiato, in cui viene inserito il codice che l'attaccante desidera eseguire.\n<li class=\"l\"> Tramite D-Bus, il processo networkd-dispatcher riceve un segnale che specifica nel OperationalState il valore \u00ab..\/..\/..\/..\/tmp\/nimbuspwn\/poc\u00bb. Per inviare il segnale nello spazio dei nomi \u00aborg.freedesktop.network1\u00bb \u00e8 stata utilizzata la possibilit\u00e0 di collegare i propri gestori a systemd-networkd, ad esempio tramite manipolazioni con gpgv o epmd, oppure si pu\u00f2 approfittare del fatto che systemd-networkd non \u00e8 avviato per impostazione predefinita (ad esempio, in Linux Mint).\n<li class=\"l\"> Dopo aver ricevuto il segnale, Networkd-dispatcher costruisce un elenco di file eseguibili, appartenenti all'utente root e disponibili nella directory \u00ab\/etc\/networkd-dispatcher\/..\/..\/..\/tmp\/nimbuspwn\/poc.d\u00bb, che in realt\u00e0 punta a \u00ab\/sbin\u00bb.\n<li class=\"l\"> Nel momento in cui l'elenco dei file \u00e8 stato ottenuto, ma lo script non \u00e8 ancora stato avviato, il collegamento simbolico viene reindirizzato da &lt;\/tmp\/nimbuspwn\/poc.d&gt; a &lt;\/tmp\/nimbuspwn&gt; e networkd-dispatcher avvier\u00e0 con i privilegi di root lo script posizionato dall'attaccante.        <\/ul>\n<p>    <center><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 in networkd-dispatcher che consentono di ottenere diritti di root\" src=\"\/wp-content\/uploads\/2022\/04\/15109315e192eb6384601dfafc436775.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>Fonte: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - 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 \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,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"it_IT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"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\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\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 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root | ProHoster\" \/>\n\t\t<meta property=\"og: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 \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,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-04-27T13:36:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2022-04-27T13:36:49+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilit\u00e0 nel networkd-dispatcher che consentono di ottenere diritti di root | ProHoster","description":"I ricercatori di sicurezza di Microsoft hanno identificato due vulnerabilit\u00e0 (CVE-2022-29799, CVE-2022-29800) nel servizio networkd-dispatcher, denominate Nimbuspwn, che consentono a un utente non privilegiato di eseguire comandi arbitrari con i diritti di root. Il problema \u00e8 stato risolto nella versione 2.2 di networkd-dispatcher. Attualmente non ci sono informazioni sulla pubblicazione degli aggiornamenti da parte delle distribuzioni (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux). Networkd-dispatcher \u00e8 utilizzato in molte distribuzioni Linux, tra cui Ubuntu.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root | ProHoster","og:description":"\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). 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