{"id":103483,"date":"2022-03-06T15:36:45","date_gmt":"2022-03-06T13:36:47","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-cgroups-v1-pozvolyayushhaya-vyjti-iz-izolirovannogo-kontejnera"},"modified":"2022-03-06T15:36:45","modified_gmt":"2022-03-06T13:36:47","slug":"uyazvimost-v-cgroups-v1-pozvolyayushhaya-vyjti-iz-izolirovannogo-kontejnera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-cgroups-v1-pozvolyayushhaya-vyjti-iz-izolirovannogo-kontejnera","title":{"rendered":"Vulnerabilit\u00e0 in cgroups v1 che consente di uscire da un contenitore isolato","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Sono emersi dettagli su una vulnerabilit\u00e0 (CVE-2022-0492) nell'implementazione del meccanismo di limitazione delle risorse cgroups v1 nel kernel Linux, che pu\u00f2 essere sfruttata per uscire da contenitori isolati. Il problema si manifesta a partire dal kernel Linux 2.6.24 ed \u00e8 stato corretto nelle versioni del kernel 5.16.12, 5.15.26, 5.10.97, 5.4.177, 4.19.229, 4.14.266 e 4.9.301. \u00c8 possibile tenere traccia della pubblicazione degli aggiornamenti dei pacchetti nelle distribuzioni sulle seguenti pagine: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. <\/p>\n

\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 \u0444\u0430\u0439\u043b\u043e\u0432 release_agent, \u0438\u0437-\u0437\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043d\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u043b\u0438\u0441\u044c \u0434\u043e\u043b\u0436\u043d\u044b\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430 \u0441 \u043f\u043e\u043b\u043d\u044b\u043c \u043d\u0430\u0431\u043e\u0440\u043e\u043c \u043f\u043e\u043b\u043d\u043e\u043c\u043e\u0447\u0438\u0439. \u0424\u0430\u0439\u043b release_agent \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u0439 \u044f\u0434\u0440\u043e\u043c \u043f\u0440\u0438 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 \u0432 cgroup. \u0414\u0430\u043d\u043d\u0430\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u0442\u0441\u044f \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0438 \u0441\u043e \u0432\u0441\u0435\u043c\u0438 «capabilities» \u0432 \u043a\u043e\u0440\u043d\u0435\u0432\u043e\u043c \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u0438\u043c\u0451\u043d. \u041f\u043e\u0434\u0440\u0430\u0437\u0443\u043c\u0435\u0432\u0430\u043b\u043e\u0441\u044c, \u0447\u0442\u043e \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0435 release_agent \u0438\u043c\u0435\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440, \u043d\u043e \u043d\u0430 \u0434\u0435\u043b\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u043b\u0438\u0441\u044c \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e root, \u0447\u0442\u043e \u043d\u0435 \u0438\u0441\u043a\u043b\u044e\u0447\u0430\u043b\u043e \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0438\u043b\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c root \u0431\u0435\u0437 \u043f\u0440\u0430\u0432 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430 (CAP_SYS_ADMIN). <\/p>\n

In passato, tale caratteristica non sarebbe stata vista come una vulnerabilit\u00e0, ma la situazione \u00e8 cambiata con l'introduzione degli spazi dei nomi degli identificatori degli utenti (user namespaces), che permettono di creare all'interno dei container utenti root separati, non in conflitto con l'utente root dell'ambiente principale. Di conseguenza, per attaccare \u00e8 sufficiente connettere il proprio handler release_agent in un container che ha il proprio utente root in uno spazio di identificazione degli utenti separato, il quale verr\u00e0 eseguito con pieni privilegi dell'ambiente principale dopo il termine del processo. <\/p>\n

Di default, cgroupfs \u00e8 montato nel container in modalit\u00e0 di sola lettura, ma non ci sono problemi a rimontare questo pseudo filesystem in modalit\u00e0 di scrittura se si hanno i diritti CAP_SYS_ADMIN o creando tramite la chiamata di sistema un container annidato con uno spazio dei nomi degli utenti separato, in cui per il container creato sono disponibili i diritti CAP_SYS_ADMIN.

\"Vulnerabilit\u00e0<\/center> <\/p>\n

Un attacco pu\u00f2 essere effettuato con i privilegi di root in un contenitore isolato o avviando un contenitore senza il flag no_new_privs, che vieta l'acquisizione di privilegi aggiuntivi. La sistema deve avere attivato il supporto per i namespaces utente (che \u00e8 attivato di default in Ubuntu e Fedora, ma non in Debian e RHEL) e deve avere accesso al gruppo cgroup v1 root (ad esempio, Docker avvia i contenitori nel gruppo RDMA root cgroup). L'attacco \u00e8 possibile anche con i privilegi CAP_SYS_ADMIN, in questo caso non \u00e8 richiesta la supporto per i namespaces utente e l'accesso alla gerarchia cgroup v1 root. <\/p>\n

\u041a\u0440\u043e\u043c\u0435 \u0432\u044b\u0445\u043e\u0434\u0430 \u0438\u0437 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c, \u0437\u0430\u043f\u0443\u0449\u0435\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c root \u0431\u0435\u0437 «capabilities» \u0438\u043b\u0438 \u043b\u044e\u0431\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 CAP_DAC_OVERRIDE (\u0434\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0444\u0430\u0439\u043b\u0443 \/sys\/fs\/cgroup\/*\/release_agent, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0438\u0442 root), \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a\u043e \u0432\u0441\u0435\u043c \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u043c «capabilities». <\/p>\n

Si segnala che la vulnerabilit\u00e0 non pu\u00f2 essere sfruttata quando sono attivi meccanismi di protezione come Seccomp, AppArmor o SELinux per un'ulteriore isolamento dei contenitori, poich\u00e9 Seccomp blocca l'accesso alla chiamata di sistema unshare(), e AppArmor e SELinux non consentono di montare cgroupfs in modalit\u00e0 scrittura.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0434\u0435\u0442\u0430\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-0492) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 cgroups v1 \u0432 \u044f\u0434\u0440\u0435 Linux, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0432\u044b\u0445\u043e\u0434\u0430 \u0438\u0437 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 2.6.24 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u044f\u0434\u0440\u0430 5.16.12, 5.15.26, 5.10.97, 5.4.177, 4.19.229, 4.14.266 \u0438 4.9.301. \u041f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u0437\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0439 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043d\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0430\u0445: Debian, SUSE, […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103484,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103483","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47 Vulnerabilit\u00e0 in cgroups v1 che consente di uscire da un container isolato | ProHoster","description":"Sono stati rivelati i dettagli di una vulnerabilit\u00e0 (CVE-2022-0492) nell'implementazione del meccanismo di limitazione delle risorse cgroups v1 nel kernel Linux, che pu\u00f2 essere sfruttata per uscire da container isolati. Il problema si manifesta a partire dal kernel Linux 2.6.24 ed \u00e8 stato risolto nelle versioni del kernel 5.16.12, 5.15.26, 5.10.97, 5.4.177, 4.19.229, 4.14.266 e 4.9.301. Puoi monitorare le pubblicazioni degli aggiornamenti dei pacchetti nelle distribuzioni sui seguenti siti: Debian, SUSE,","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-cgroups-v1-pozvolyayushhaya-vyjti-iz-izolirovannogo-kontejnera","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\u044c \u0432 cgroups v1, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0434\u0435\u0442\u0430\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-0492) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 cgroups v1 \u0432 \u044f\u0434\u0440\u0435 Linux, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0432\u044b\u0445\u043e\u0434\u0430 \u0438\u0437 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 2.6.24 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u044f\u0434\u0440\u0430 5.16.12, 5.15.26, 5.10.97, 5.4.177, 4.19.229, 4.14.266 \u0438 4.9.301. \u041f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u0437\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0439 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043d\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0430\u0445: Debian, 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