{"id":37426,"date":"2019-10-31T22:17:33","date_gmt":"2019-10-31T19:17:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-pozvolyayushhaya-vyjti-iz-izolirovannogo-okruzheniya-qemu\/"},"modified":"2019-10-31T22:17:33","modified_gmt":"2019-10-31T19:17:33","slug":"uyazvimost-pozvolyayushhaya-vyjti-iz-izolirovannogo-okruzheniya-qemu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimost-pozvolyayushhaya-vyjti-iz-izolirovannogo-okruzheniya-qemu","title":{"rendered":"S\u00e5rbarhet som m\u00f6jligg\u00f6r att l\u00e4mna en isolerad milj\u00f6 i QEMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avsl\u00f6jade<\/a><\/noindex> detaljer om en kritisk s\u00e5rbarhet (CVE-2019-14378<\/a><\/noindex>) i SLIRP-hanteraren, som som standard anv\u00e4nds i QEMU f\u00f6r att organisera kommunikationskanalen mellan virtuellt n\u00e4tverkskort i g\u00e4stsystemet och n\u00e4tverksbackend p\u00e5 QEMU-sidan. Problemet p\u00e5verkar ocks\u00e5 KVM-baserade virtualiseringssystem (i l\u00e4get Usermode<\/a><\/noindex>) och Virtualbox, d\u00e4r QEMU:s slirp-backend anv\u00e4nds, samt applikationer som anv\u00e4nder n\u00e4tverksstacken i anv\u00e4ndarrummet libSLIRP<\/a><\/noindex> (TCP\/IP-emulator).<\/p>\n

S\u00e5rbarheten g\u00f6r det m\u00f6jligt att utf\u00f6ra kod p\u00e5 v\u00e4rdsystemet med r\u00e4ttigheterna f\u00f6r QEMU:s processhanterare n\u00e4r ett specialdesignat mycket stort n\u00e4tverkspaket skickas fr\u00e5n g\u00e4stsystemet, vilket kr\u00e4ver fragmentering. P\u00e5 grund av ett fel i funktionen ip_reass(), som anropas vid ombyggnad av inkommande paket, kan den f\u00f6rsta fragmentet inte f\u00e5 plats i den tilldelade bufferten och dess svans skrivs in i efterf\u00f6ljande minnesomr\u00e5den. <\/p>\n

F\u00f6r att testa redan \u00e4r tillg\u00e4nglig<\/a><\/noindex> en fungerande prototyp av ett exploit, som inkluderar omg\u00e5else av ASLR och k\u00f6rning av kod genom omskrivning av minnet i arrayen main_loop_tlg, som inkluderar listan QEMUTimerList med hanterare som anropas med timer.
\nS\u00e5rbarheten har redan \u00e5tg\u00e4rdats i Fedora<\/a><\/noindex> och SUSE\/openSUSE<\/a><\/noindex>, men f\u00f6rblir o\u00e5tg\u00e4rdad i Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex> och FreeBSD<\/a><\/noindex>. I Ubuntu<\/a><\/noindex> och RHEL<\/a><\/noindex> problemet manifesterar sig inte p\u00e5 grund av att slirp inte anv\u00e4nds. S\u00e5rbarheten f\u00f6rblir o\u00e5tg\u00e4rdad i den senaste versionen av libslirp 4.0<\/a><\/noindex> (fixen \u00e4r f\u00f6r n\u00e4rvarande tillg\u00e4nglig som en patch<\/a><\/noindex>).<\/p>\n

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

K\u00e4lla: 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 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2019-14378) \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 SLIRP, \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432 QEMU \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u0430\u043d\u0430\u043b\u0430 \u0441\u0432\u044f\u0437\u0438 \u043c\u0435\u0436\u0434\u0443 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u043c \u0441\u0435\u0442\u0435\u0432\u044b\u043c \u0430\u0434\u0430\u043f\u0442\u0435\u0440\u043e\u043c \u0432 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u043c \u0431\u044d\u043a\u0435\u043d\u0434\u043e\u043c \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 QEMU. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0442\u0430\u043a\u0436\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043d\u0430 \u0431\u0430\u0437\u0435 KVM (\u0432 \u0440\u0435\u0436\u0438\u043c\u0435 Usermode) \u0438 Virtualbox, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0431\u044d\u043a\u0435\u043d\u0434 slirp \u0438\u0437 QEMU, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0438\u0435 \u0441\u0435\u0442\u0435\u0432\u043e\u0439 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