{"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\/cs\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"V Webmin byla nalezena zranitelnost, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00fd p\u0159\u00edstup s pr\u00e1vy root.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V bal\u00ed\u010dku Webmin<\/a><\/noindex>, kter\u00fd poskytuje prost\u0159edky pro vzd\u00e1lenou spr\u00e1vu serveru, byl nalezen<\/a><\/noindex> zranitelnost (CVE-2019-15107<\/a><\/noindex>), objeven\u00e1 v ofici\u00e1ln\u00edch sestaven\u00edch projektu, distribuovan\u00fdch<\/a><\/noindex> p\u0159es Sourceforge a doporu\u010den\u00fdch<\/a><\/noindex> na hlavn\u00ed str\u00e1nce. Zranitelnost byla p\u0159\u00edtomna v sestaven\u00edch od 1.882 do 1.921 v\u010detn\u011b (v git-repozit\u00e1\u0159i k\u00f3d se zranitelnost\u00ed chyb\u011bl) a umo\u017enila vzd\u00e1len\u00e9 prov\u00e1d\u011bn\u00ed libovoln\u00fdch shellov\u00fdch p\u0159\u00edkaz\u016f v syst\u00e9mu s pr\u00e1vy root bez nutnosti autentizace. <\/p>\n

Pro \u00fatok sta\u010d\u00ed m\u00edt otev\u0159en\u00fd s\u00ed\u0165ov\u00fd port s Webmin a aktivitu ve webov\u00e9m rozhran\u00ed funkce pro zm\u011bnu zastaral\u00e9ho hesla (ve v\u00fdchoz\u00edm stavu je zahrnuta v sestaven\u00edch 1.890, ale v ostatn\u00edch verz\u00edch je vypnuta). Probl\u00e9m odstran\u011bna<\/a><\/noindex> v byl vy\u0159e\u0161en<\/a><\/noindex> 1.930. Jako do\u010dasn\u00e9 opat\u0159en\u00ed k zablokov\u00e1n\u00ed backdooru sta\u010d\u00ed odstranit nastaven\u00ed «passwd_mode=» z konfigura\u010dn\u00edho souboru \/etc\/webmin\/miniserv.conf. Pro testov\u00e1n\u00ed byl p\u0159ipraven prototyp exploit\u016f.<\/a><\/noindex>.<\/p>\n

Probl\u00e9m byl nalezeno<\/a><\/noindex> ve sk\u0440\u0438\u043ftu password_change.cgi, ve kter\u00e9m pro ov\u011b\u0159en\u00ed zadan\u00e9ho star\u00e9ho hesla ve webov\u00e9m formul\u00e1\u0159i se pou\u017e\u00edv\u00e1<\/a><\/noindex> funkce unix_crypt, kter\u00e9 je p\u0159ed\u00e1v\u00e1n zadan\u00fd u\u017eivatelsk\u00fd heslo bez proveden\u00ed escapov\u00e1n\u00ed speci\u00e1ln\u00edch znak\u016f. V git-repozit\u00e1\u0159i tato funkce je<\/a><\/noindex> vrstvu nad modulem Crypt::UnixCrypt a nep\u0159edstavuje nebezpe\u010d\u00ed, ale v dod\u00e1van\u00e9m archivu s k\u00f3dem na webu Sourceforge se vyvol\u00e1v\u00e1 k\u00f3d, kter\u00fd se p\u0159\u00edmo obrac\u00ed na \/etc\/shadow, a to pomoc\u00ed shellov\u00e9 konstrukce. Pro \u00fatok sta\u010d\u00ed uv\u00e9st v poli se star\u00fdm heslem znak «|» a n\u00e1sleduj\u00edc\u00ed k\u00f3d bude proveden s pr\u00e1vy root na serveru.<\/p>\n

Podle Podle<\/a><\/noindex> v\u00fdvoj\u00e1\u0159\u016f Webminu, byl \u0161kodliv\u00fd k\u00f3d implementov\u00e1n v d\u016fsledku kompromitace infrastruktur projektu. Podrobnosti zat\u00edm nejsou zn\u00e1my, tak\u017ee nen\u00ed jasn\u00e9, zda byla hackem ovlivn\u011bna pouze spr\u00e1vcovsk\u00e1 \u00fa\u010det na Sourceforge, nebo zda byly posti\u017eeny i dal\u0161\u00ed prvky v\u00fdvojov\u00e9 a sestavovac\u00ed infrastruktury Webminu. \u0160kodliv\u00fd k\u00f3d byl p\u0159\u00edtomen v archivech od b\u0159ezna 2018. Probl\u00e9m se tak\u00e9 t\u00fdkal sestaven\u00ed Usermin.<\/a><\/noindex>V sou\u010dasn\u00e9 dob\u011b byly v\u0161echny spustiteln\u00e9 archivy znovu sestaveny z Gitu.<\/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 byla nalezena zadn\u00ed vr\u00e1tka, kter\u00e1 umo\u017e\u0148uj\u00ed vzd\u00e1len\u00fd p\u0159\u00edstup s pr\u00e1vy root | ProHoster","description":"V bal\u00ed\u010dku Webmin, kter\u00fd poskytuje prost\u0159edky pro vzd\u00e1lenou 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