{"id":101307,"date":"2021-09-17T10:22:35","date_gmt":"2021-09-17T08:22:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemaya-uyazvimost-v-omi-agente-navyazyvaemom-v-linux-okruzheniyah-microsoft-azure"},"modified":"2021-09-17T10:22:35","modified_gmt":"2021-09-17T08:22:35","slug":"udalyonno-ekspluatiruemaya-uyazvimost-v-omi-agente-navyazyvaemom-v-linux-okruzheniyah-microsoft-azure","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/udalyonno-ekspluatiruemaya-uyazvimost-v-omi-agente-navyazyvaemom-v-linux-okruzheniyah-microsoft-azure","title":{"rendered":"Vulnerabilit\u00e0 sfruttabile da remoto nell'agente OMI, imposto negli ambienti Linux di Microsoft Azure","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I clienti della piattaforma cloud Microsoft Azure che utilizzano Linux nelle macchine virtuali hanno riscontrato una vulnerabilit\u00e0 critica (CVE-2021-38647) che consente l'esecuzione remota di codice con diritti di root. La vulnerabilit\u00e0, denominata OMIGOD, \u00e8 notevole perch\u00e9 il problema si trova nell'applicazione OMI Agent, che viene installata silenziosamente negli ambienti Linux. <\/p>\n

OMI Agent viene installato e attivato automaticamente quando si utilizzano servizi come Azure Automation, Azure Automatic Update, Azure Operations Management Suite, Azure Log Analytics, Azure Configuration Management, Azure Diagnostics e Azure Container Insights. Ad esempio, gli ambienti Linux in Azure che hanno il monitoraggio abilitato sono vulnerabili agli attacchi. L'agente fa parte del pacchetto open source OMI (Open Management Infrastructure Agent) che implementa lo stack DMTF CIM\/WBEM per la gestione delle infrastrutture IT. <\/p>\n

L'agente OMI si installa nel sistema sotto l'utente omsagent e crea impostazioni in \/etc\/sudoers per eseguire una serie di script con i diritti di root. Durante il funzionamento di alcuni servizi, vengono creati socket di rete su porte 5985, 5986 e 1270. La scansione nel servizio Shodan mostra la presenza di oltre 15.000 ambienti Linux vulnerabili in rete. Attualmente \u00e8 gi\u00e0 disponibile un prototipo funzionante di exploit, che consente di eseguire codice con diritti di root su tali sistemi. <\/p>\n

Il problema \u00e8 aggravato dal fatto che in Azure non \u00e8 chiaramente documentato l'uso di OMI e OMI Agent viene installato senza preavviso \u2014 basta accettare i termini del servizio selezionato durante la configurazione dell'ambiente e OMI Agent verr\u00e0 attivato automaticamente, cio\u00e8 la maggior parte degli utenti non sospetta nemmeno della sua presenza. <\/p>\n

Il metodo di sfruttamento \u00e8 banale \u2014 \u00e8 sufficiente inviare una richiesta XML all'agente, rimuovendo l'intestazione responsabile per l'autenticazione. OMI utilizza l'autenticazione quando riceve messaggi di controllo, verificando che il client abbia il diritto di inviare un determinato comando. La vulnerabilit\u00e0 risiede nel fatto che rimuovendo nel messaggio l'intestazione \u00abAuthentication\u00bb, responsabile per l'autenticazione, un server<\/a> considera il superamento del controllo come riuscito, accetta il messaggio di gestione e consente l'esecuzione di comandi con diritti di root. Per eseguire comandi arbitrari nel sistema, \u00e8 sufficiente utilizzare nel messaggio il comando standard ExecuteShellCommand_INPUT. Ad esempio, per avviare l'utilit\u00e0 \u00abid\u00bb, \u00e8 sufficiente inviare la richiesta: curl -H \"Content-Type: application\/soap+xml;charset=UTF-8\" -k --data-binary \"@http_body.txt\" https:\/\/10.0.0.5:5986\/wsman ...

id<\/p>

0<\/p> <\/p> <\/s> <\/s> <\/p>\n

Microsoft ha gi\u00e0 rilasciato l'aggiornamento OMI 1.6.8.1 per risolvere la vulnerabilit\u00e0, ma non \u00e8 ancora stato distribuito agli utenti di Microsoft Azure (nelle nuove istanze \u00e8 ancora installata la vecchia versione di OMI). L'aggiornamento automatico dell'agente non \u00e8 supportato, quindi gli utenti devono eseguire l'aggiornamento del pacchetto manualmente, utilizzando i comandi \u00abdpkg -l omi\u00bb in Debian\/Ubuntu o \u00abrpm -qa omi\u00bb in Fedora\/RHEL. Come misura di protezione alternativa, si raccomanda di bloccare l'accesso alle porte di rete 5985, 5986 e 1270. <\/p>\n

Oltre alla CVE-2021-38647, in OMI 1.6.8.1 sono state risolte tre vulnerabilit\u00e0 (CVE-2021-38648, CVE-2021-38645 e CVE-2021-38649) che consentono a un utente locale non privilegiato di eseguire il proprio codice con privilegi di root.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043b\u0438\u0435\u043d\u0442\u044b \u043e\u0431\u043b\u0430\u0447\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b Microsoft Azure, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0435 Linux \u0432 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d\u0430\u0445, \u0441\u0442\u043e\u043b\u043a\u043d\u0443\u043b\u0438\u0441\u044c \u0441 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c\u044e (CVE-2021-38647), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f OMIGOD \u0438 \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0438 OMI Agent, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u0435\u0437 \u043b\u0438\u0448\u043d\u0435\u0439 \u043e\u0433\u043b\u0430\u0441\u043a\u0438 \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 Linux-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. OMI Agent \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0438 \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0442\u0430\u043a\u0438\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432, \u043a\u0430\u043a […]<\/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-101307","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilit\u00e0 remota nel servizio OMI, imposta in ambienti Linux su Microsoft Azure | ProHoster","description":"I clienti della piattaforma cloud Microsoft Azure che utilizzano Linux su macchine virtuali si sono trovati di fronte a una vulnerabilit\u00e0 critica (CVE-2021-38647), che consente di eseguire codice da remoto con privilegi di root. La vulnerabilit\u00e0 \u00e8 stata soprannominata OMIGOD ed \u00e8 notevole perch\u00e9 il problema \u00e8 presente nell'applicazione OMI Agent, installata senza troppe difficolt\u00e0 negli ambienti Linux. OMI Agent viene installato e attivato automaticamente quando si utilizzano servizi come","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/udalyonno-ekspluatiruemaya-uyazvimost-v-omi-agente-navyazyvaemom-v-linux-okruzheniyah-microsoft-azure","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\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 OMI-\u0430\u0433\u0435\u043d\u0442\u0435, \u043d\u0430\u0432\u044f\u0437\u044b\u0432\u0430\u0435\u043c\u043e\u043c \u0432 Linux-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u0445 Microsoft Azure | ProHoster","og:description":"\u041a\u043b\u0438\u0435\u043d\u0442\u044b \u043e\u0431\u043b\u0430\u0447\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b Microsoft Azure, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0435 Linux \u0432 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d\u0430\u0445, \u0441\u0442\u043e\u043b\u043a\u043d\u0443\u043b\u0438\u0441\u044c \u0441 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c\u044e (CVE-2021-38647), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f OMIGOD \u0438 \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0438 OMI Agent, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u0435\u0437 \u043b\u0438\u0448\u043d\u0435\u0439 \u043e\u0433\u043b\u0430\u0441\u043a\u0438 \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 Linux-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. 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