{"id":103829,"date":"2022-04-20T21:36:45","date_gmt":"2022-04-20T19:36:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-libinput-privodyashhaya-k-vypolneniyu-koda-pri-podklyuchenii-vredonosnogo-ustrojstva"},"modified":"2022-04-20T21:36:45","modified_gmt":"2022-04-20T19:36:45","slug":"uyazvimost-v-libinput-privodyashhaya-k-vypolneniyu-koda-pri-podklyuchenii-vredonosnogo-ustrojstva","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-libinput-privodyashhaya-k-vypolneniyu-koda-pri-podklyuchenii-vredonosnogo-ustrojstva","title":{"rendered":"Zranite\u013enos\u0165 v libinput, ktor\u00e1 umo\u017e\u0148uje vykon\u00e1vanie k\u00f3du pri pripojen\u00ed \u0161kodliv\u00e9ho zariadenia","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V kni\u017enici libinput 1.20.1, ktor\u00e1 poskytuje unified input stack umo\u017e\u0148uj\u00faci vyu\u017e\u00edva\u0165 rovnak\u00e9 prostriedky spracovania udalost\u00ed z vstupn\u00fdch zariaden\u00ed v prostrediach zalo\u017een\u00fdch na Waylande a X.Org, bola odstr\u00e1nen\u00e1 zranite\u013enos\u0165 (CVE-2022-1215), ktor\u00e1 umo\u017e\u0148uje vykonanie vlastn\u00e9ho k\u00f3du pri pripojen\u00ed \u0161peci\u00e1lne modifikovan\u00e9ho \/emulovan\u00e9ho vstupn\u00e9ho zariadenia k syst\u00e9mu. Probl\u00e9m sa prejavuje v prostrediach zalo\u017een\u00fdch na X.Org a Waylande a m\u00f4\u017ee by\u0165 zneu\u017eit\u00fd ako pri lok\u00e1lnom pripojen\u00ed zariaden\u00ed, tak aj pri manipul\u00e1ci\u00e1ch so zariadeniami s rozhran\u00edm Bluetooth. Ak je X-server spusten\u00fd s pr\u00e1vami roota, zranite\u013enos\u0165 umo\u017e\u0148uje dosiahnu\u0165 vykonanie k\u00f3du s vy\u0161\u0161\u00edmi opr\u00e1vneniami. <\/p>\n

Probl\u00e9m je sp\u00f4soben\u00fd chybou vo form\u00e1tovan\u00ed re\u0165azca v k\u00f3de, ktor\u00fd je zodpovedn\u00fd za zapisovanie inform\u00e1ci\u00ed o pripojen\u00ed zariadenia do logu. Konkr\u00e9tne funkcia evdev_log_msg pomocou volania snprintf menila p\u00f4vodn\u00fd form\u00e1tovac\u00ed re\u0165azec z\u00e1pisu do logu, do ktor\u00e9ho ako prefix prid\u00e1val n\u00e1zov zariadenia. N\u00e1sledne bola zmenen\u00e1 re\u0165azec odoslan\u00e1 do funkcie log_msg_va, ktor\u00e1 n\u00e1sledne pou\u017eila funkciu printf. Takto sa do prv\u00e9ho argumentu printf, na ktor\u00fd sa pou\u017eije anal\u00fdza form\u00e1tovac\u00edch znakov, dostali neoveren\u00e9 extern\u00e9 \u00fadaje a \u00fato\u010dn\u00edk mohol sp\u00f4sobi\u0165 po\u0161kodenie z\u00e1sobn\u00edka, ak by zariadenie vr\u00e1tilo n\u00e1zov obsahuj\u00faci znaky form\u00e1tovania re\u0165azca (napr\u00edklad \u201eEvil %s\u201c).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libinput 1.20.1, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u0443\u043d\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0441\u0442\u0435\u043a \u0432\u0432\u043e\u0434\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043e\u0434\u043d\u0438 \u0438 \u0442\u0435 \u0436\u0435 \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u043e\u0431\u044b\u0442\u0438\u0439 \u043e\u0442 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0432\u0432\u043e\u0434\u0430 \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u0445 \u043d\u0430 \u0431\u0430\u0437\u0435 Wayland \u0438 X.Org, \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-1215), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0434\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e\/\u044d\u043c\u0443\u043b\u0438\u0440\u0443\u0435\u043c\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u0432\u0432\u043e\u0434\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u0445 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