{"id":37292,"date":"2019-10-31T22:16:49","date_gmt":"2019-10-31T19:16:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root\/"},"modified":"2019-10-31T22:16:49","modified_gmt":"2019-10-31T19:16:49","slug":"v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"Vo Webmine bola n\u00e1jden\u00e1 zadn\u00e1 br\u00e1na, ktor\u00e1 umo\u017e\u0148uje vzdialen\u00fd pr\u00edstup s pr\u00e1vami root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V bal\u00edku Webmin<\/a><\/noindex>, ktor\u00fd poskytuje prostriedky na vzdialen\u00e9 spravovanie servera, bol zisten\u00fd<\/a><\/noindex> zadn\u00fd vchod (CVE-2019-15107<\/a><\/noindex>), objaven\u00fd v ofici\u00e1lnych zostav\u00e1ch projektu, roz\u0161irovan\u00fdch<\/a><\/noindex> cez Sourceforge a odpor\u00fa\u010dan\u00fdch<\/a><\/noindex> na hlavnej str\u00e1nke. Zadn\u00fd vchod bol pr\u00edtomn\u00fd v zostav\u00e1ch od 1.882 po 1.921 vr\u00e1tane (v git-repozit\u00e1ri k\u00f3d so zadn\u00fdm vchodom ch\u00fdbal) a umo\u017e\u0148oval vzdialene bez overenia vykon\u00e1va\u0165 \u013eubovo\u013en\u00e9 shellov\u00e9 pr\u00edkazy v syst\u00e9me s pr\u00e1vami root. <\/p>\n

Na \u00fatok sta\u010d\u00ed ma\u0165 otvoren\u00fd sie\u0165ov\u00fd port s Webmin a aktivitu v webovom rozhran\u00ed funkcie zmeny zastaran\u00e9ho hesla (predvolene zapnut\u00e9 v zostav\u00e1ch 1.890, ale v ostatn\u00fdch verzi\u00e1ch vypnut\u00e9). Probl\u00e9m bola odstr\u00e1nen\u00e1<\/a><\/noindex> v aktualiz\u00e1cii<\/a><\/noindex> 1.930. Ako do\u010dasn\u00e9 opatrenie na zablokovanie backdoor-u sta\u010d\u00ed odstr\u00e1ni\u0165 nastavenie «passwd_mode=» z konfigura\u010dn\u00e9ho s\u00faboru \/etc\/webmin\/miniserv.conf. Pre testovanie je pripraven\u00fd prototyp exploit<\/a><\/noindex>.<\/p>\n

Probl\u00e9m bol objaven\u00e1<\/a><\/noindex> v skripte password_change.cgi, v ktorom sa na overenie zadan\u00e9ho star\u00e9ho hesla vo webformul\u00e1ri sa pou\u017e\u00edva<\/a><\/noindex> pou\u017e\u00edva funkcia unix_crypt, ktorej sa odovzd\u00e1va z\u00edskan\u00e9 od pou\u017e\u00edvate\u013ea heslo bez vykon\u00e1vania escapovania \u0161peci\u00e1lnych znakov. V git-repozit\u00e1ri t\u00e1to funkcia je<\/a><\/noindex> obal nad modulom Crypt::UnixCrypt a nepredstavuje nebezpe\u010denstvo, ale v dod\u00e1vanom arch\u00edve s k\u00f3dom na str\u00e1nke Sourceforge sa sp\u00fa\u0161\u0165a k\u00f3d, ktor\u00fd sa priamo obracia na \/etc\/shadow, a to pomocou shellovej kon\u0161trukcie. Na \u00fatok sta\u010d\u00ed uvies\u0165 do po\u013ea so star\u00fdm heslom symbol «|» a nasleduj\u00faci po \u0148om k\u00f3d bude vykonan\u00fd s opr\u00e1vneniami root na serveri.<\/p>\n

V porovnan\u00ed vyhl\u00e1seniu<\/a><\/noindex> v\u00fdvoj\u00e1rov Webmin, \u0161kodliv\u00fd k\u00f3d bol vlo\u017een\u00fd v d\u00f4sledku kompromit\u00e1cie infra\u0161trukt\u00fary projektu. Podrobnosti zatia\u013e neboli ozn\u00e1men\u00e9, a preto nie je jasn\u00e9, \u010di sa hack obmedzil na prevzatie kontroly nad \u00fa\u010dtom v Sourceforge alebo sa dotkol aj in\u00fdch prvkov infra\u0161trukt\u00fary v\u00fdvoja a zostavovania Webmin. \u0160kodliv\u00fd k\u00f3d bol pr\u00edtomn\u00fd v arch\u00edvoch od marca 2018. Probl\u00e9m tie\u017e zasiahol zostavy Usermin<\/a><\/noindex>. V s\u00fa\u010dasnosti s\u00fa v\u0161etky sp\u00fa\u0161\u0165acie arch\u00edvy prekompilovan\u00e9 z Git.<\/p>\n

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

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

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 Webmin, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c, \u0432\u044b\u044f\u0432\u043b\u0435\u043d \u0431\u044d\u043a\u0434\u043e\u0440 (CVE-2019-15107), \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u0439 \u0432 \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0445 \u0447\u0435\u0440\u0435\u0437 Sourceforge \u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0441\u0430\u0439\u0442\u0435. \u0411\u044d\u043a\u0434\u043e\u0440 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u043b \u0432 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 \u0441 1.882 \u043f\u043e 1.921 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (\u0432 git-\u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0438 \u043a\u043e\u0434 \u0441 \u0431\u044d\u043a\u0434\u043e\u0440\u043e\u043c \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u043b) \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u043b \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0435 shell-\u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u0414\u043b\u044f […]<\/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-37292","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47V Webmin n\u00e1jden\u00fd zadn\u00fd vchod, ktor\u00fd umo\u017e\u0148uje vzdialen\u00fd pr\u00edstup s pr\u00e1vami root | ProHoster","description":"V bal\u00edku Webmin, ktor\u00fd poskytuje prostriedky na vzdialen\u00e9 spravovanie 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