{"id":100021,"date":"2021-04-25T10:22:49","date_gmt":"2021-04-25T08:22:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda"},"modified":"2021-04-25T10:22:49","modified_gmt":"2021-04-25T08:22:49","slug":"uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda","title":{"rendered":"Zranitelnost v Gitu pro Cygwin, umo\u017e\u0148uj\u00edc\u00ed prov\u00e1d\u011bn\u00ed k\u00f3du","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V Gitu byla zji\u0161t\u011bna kritick\u00e1 zranitelnost (CVE-2021-29468), kter\u00e1 se projevuje pouze p\u0159i sestavov\u00e1n\u00ed pro prost\u0159ed\u00ed Cygwin (knihovna pro emulaci z\u00e1kladn\u00edho Linux API ve Windows a sadu typov\u00fdch linuxov\u00fdch program\u016f pro Windows). Zranitelnost umo\u017e\u0148uje vykonat k\u00f3d \u00fato\u010dn\u00edka p\u0159i z\u00edsk\u00e1v\u00e1n\u00ed dat (\"git checkout\") z repozit\u00e1\u0159e, kter\u00fd je pod kontrolou \u00fato\u010dn\u00edka. Probl\u00e9m byl vy\u0159e\u0161en v bal\u00ed\u010dku git 2.31.1-2 pro Cygwin. V hlavn\u00edm projektu Gitu v\u0161ak probl\u00e9m zat\u00edm nebyl opraven (je nepravd\u011bpodobn\u00e9, \u017ee by si n\u011bkdo sestavoval git pro Cygwin vlastn\u00edmi silami, sp\u00ed\u0161e pou\u017e\u00edv\u00e1 p\u0159ipraven\u00fd bal\u00ed\u010dek). <\/p>\n

Zranitelnost je zp\u016fsobena zpracov\u00e1n\u00edm prost\u0159ed\u00ed Cygwin jako Unixov\u00e9ho syst\u00e9mu, a ne Windows, co\u017e vede k absenci omezen\u00ed na pou\u017e\u00edv\u00e1n\u00ed znaku \u2018\\\u2019 v cest\u011b, zat\u00edmco v Cygwin, stejn\u011b jako ve Windows, m\u016f\u017ee b\u00fdt tento znak pou\u017e\u00edv\u00e1n k odd\u011blen\u00ed adres\u00e1\u0159\u016f. V d\u016fsledku toho, skrze vytvo\u0159en\u00ed speci\u00e1ln\u011b modifikovan\u00e9ho repozit\u00e1\u0159e obsahuj\u00edc\u00edho symbolick\u00e9 odkazy a soubory se znakem zp\u011btn\u00e9ho lom\u00edtka, je mo\u017en\u00e9 dos\u00e1hnout p\u0159eps\u00e1n\u00ed libovoln\u00fdch soubor\u016f p\u0159i na\u010d\u00edt\u00e1n\u00ed tohoto repozit\u00e1\u0159e v Cygwin (v Gitu pro Windows byla podobn\u00e1 zranitelnost opravena v roce 2019). Z\u00edsk\u00e1n\u00edm mo\u017enosti p\u0159eps\u00e1n\u00ed soubor\u016f m\u016f\u017ee \u00fato\u010dn\u00edk p\u0159edefinovat hook-v\u00fdzvy v git a dos\u00e1hnout prov\u00e1d\u011bn\u00ed libovoln\u00e9ho k\u00f3du v syst\u00e9mu.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Git \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-29468), \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u044e\u0449\u0430\u044f\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0441\u0431\u043e\u0440\u043a\u0435 \u0434\u043b\u044f \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f Cygwin (\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u044d\u043c\u0443\u043b\u044f\u0446\u0438\u0438 \u0431\u0430\u0437\u043e\u0432\u043e\u0433\u043e Linux API \u0432 Windows \u0438 \u043d\u0430\u0431\u043e\u0440 \u0442\u0438\u043f\u043e\u0432\u044b\u0445 linux-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u0434\u043b\u044f Windows). \u0423\u044f\u0432\u0437\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u043f\u0440\u0438 \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 («git checkout») \u0438\u0437 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043f\u0430\u043a\u0435\u0442\u0435 git 2.31.1-2 \u0434\u043b\u044f Cygwin. \u0412 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u0435 Git \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u043a\u0430 […]<\/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-100021","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\udd47Zranitelnost v Gitu pro Cygwin, umo\u017e\u0148uj\u00edc\u00ed spou\u0161t\u011bn\u00ed k\u00f3du | ProHoster","description":"V Gitu byla objevena kritick\u00e1 zranitelnost (CVE-2021-29468), kter\u00e1 se projevuje pouze p\u0159i sestaven\u00ed pro prost\u0159ed\u00ed Cygwin (knihovna pro emulaci z\u00e1kladn\u00edho Linux API ve Windows a sadu standardn\u00edch linuxov\u00fdch program\u016f pro 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