{"id":41582,"date":"2020-02-12T16:19:30","date_gmt":"2020-02-12T13:19:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2020-02-12T16:19:30","modified_gmt":"2020-02-12T13:19:30","slug":"uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Vulnerabilit\u00e0 in systemd, che potrebbe consentire l'aumento dei privilegi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nel gestore di sistema systemd identificata<\/a><\/noindex> vulnerabilit\u00e0 (CVE-2020-1712<\/a><\/noindex>), che consente potenzialmente l'esecuzione di codice con privilegi elevati tramite l'invio di una richiesta formattata in modo specifico attraverso il bus DBus. Il problema \u00e8 stato risolto nella versione di test systemd 245-rc1<\/a><\/noindex> (patch che risolvono il problema: 1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>). La vulnerabilit\u00e0 \u00e8 stata corretta nelle distribuzioni Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, RHEL<\/a><\/noindex> (visibile in RHEL 8, ma non interessa RHEL 7), CentOS<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex> e ROSA<\/a><\/noindex>, ma al momento della scrittura della notizia rimane non corretta in Debian<\/a><\/noindex> e Arch Linux<\/a><\/noindex>. <\/p>\n

La vulnerabilit\u00e0 \u00e8 causata da un accesso a una zona di memoria gi\u00e0 liberata (use-after-free), che si verifica durante l'esecuzione asincrona delle richieste a Polkit durante l'elaborazione dei messaggi DBus. Alcuni interfacce DBus utilizzano una cache per memorizzare gli oggetti per un breve periodo e puliscono gli elementi della cache non appena il bus DBus \u00e8 libero per gestire altre richieste. Se un gestore del metodo DBus utilizza bus_verify_polkit_async(), potrebbe dover attendere il completamento dell'operazione in Polkit. Una volta che Polkit \u00e8 pronto, il gestore viene richiamato nuovamente e accede ai dati gi\u00e0 precedentemente allocati in memoria. Se la richiesta a Polkit impiega troppo tempo, gli elementi nella cache vengono puliti prima che il gestore del metodo DBus venga chiamato per la seconda volta. <\/p>\n

Tra i servizi che consentono di sfruttare la vulnerabilit\u00e0, si segnala systemd-machined, che fornisce l'API DBus org.freedesktop.machine1.Image.Clone, portando a una temporanea memorizzazione dei dati nella cache e a chiamate asincrone a Polkit. L'interfaccia
\norg.freedesktop.machine1.Image.Clone \u00e8 accessibile a tutti gli utenti non privilegiati del sistema, che possono iniziare il crash dei servizi systemd o potenzialmente eseguire codice con diritti di root (una bozza dell'exploit non \u00e8 ancora stata dimostrata). Il codice per sfruttare la vulnerabilit\u00e0 \u00e8 stato \u00e8 stata aggiunta<\/a><\/noindex> in systemd-machined nel 2015 nella versione systemd 220<\/a><\/noindex> (in RHEL 7.x si utilizza systemd 219). <\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 systemd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-1712), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u044f\u043c\u0438 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043f\u043e \u0448\u0438\u043d\u0435 DBus. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0430 \u0432 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 systemd 245-rc1 (\u0440\u0435\u0448\u0430\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043f\u0430\u0442\u0447\u0438: 1, 2, 3). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Ubuntu, Fedora, RHEL (\u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 RHEL 8, \u043d\u043e \u043d\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 RHEL 7), CentOS, 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