{"id":184239,"date":"2026-11-12T11:41:56","date_gmt":"2026-11-12T09:41:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/uyazvimost-v-git-dopuskayushhaya-vypolnenie-koda-pri-klonirovanii-iz-vredonosnogo-git-repozitoriya"},"modified":"2026-11-12T11:42:03","modified_gmt":"2026-11-12T09:42:03","slug":"git-vulnerability-allows-code-execution-when-cloning-a-malicious-git-repository","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/git-vulnerability-allows-code-execution-when-cloning-a-malicious-git-repository","title":{"rendered":"Zranitelnost v Gitu umo\u017e\u0148uj\u00edc\u00ed prov\u00e1d\u011bn\u00ed k\u00f3du p\u0159i klonov\u00e1n\u00ed z nebezpe\u010dn\u00e9ho Git repozit\u00e1\u0159e","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byly zve\u0159ejn\u011bny opravn\u00e9 verze distribuovan\u00e9ho syst\u00e9mu spr\u00e1vy k\u00f3du Git 2.56.1, 2.55.1, 2.54.1, 2.53.1, 2.52.1, 2.51.3 a 2.50.2, ve kter\u00fdch bylo odstran\u011bno 6 zranitelnost\u00ed. Nejv\u00e1\u017en\u011bj\u0161\u00ed zranitelnost (CVE-2026-111760) umo\u017e\u0148uje dosa\u017een\u00ed spu\u0161t\u011bn\u00ed k\u00f3du p\u0159i pou\u017eit\u00ed p\u0159\u00edkazu &#171;git clone&#187; v re\u017eimu &#171;&#8212;recurse-submodules&#187; s repozit\u00e1\u0159i, kter\u00e9 ovl\u00e1d\u00e1 \u00fato\u010dn\u00edk.<\/p>\n<p>Probl\u00e9m je zp\u016fsoben t\u00edm, \u017ee d\u00e9lka z\u00e1znamu s n\u00e1zvem v indexu se po\u010d\u00edt\u00e1 s vyu\u017eit\u00edm 32bitov\u00e9ho cel\u00e9ho \u010d\u00edsla. P\u0159i p\u0159ed\u00e1n\u00ed velmi dlouh\u00e9ho n\u00e1zvu ve form\u00e1tu &#171;.git\/&#8230;.&#187; doch\u00e1z\u00ed k p\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla a \u00fato\u010dn\u00edk m\u016f\u017ee obdr\u017eet d\u00e9lku rovnaj\u00edc\u00ed se 4 bajt\u016fm. V d\u016fsledku toho jsou b\u011bhem kontroly hodnoty pou\u017eita skute\u010dn\u00e1 data, zat\u00edmco p\u0159i prov\u00e1d\u011bn\u00ed operace se pou\u017e\u00edv\u00e1 zkr\u00e1cen\u00e1 verze &#171;.git&#187;, co\u017e \u00fato\u010dn\u00edkovi umo\u017e\u0148uje nahradit soubor &#171;.git&#187; v submodulu symbolick\u00fdm odkazem ukazuj\u00edc\u00edm na adres\u00e1\u0159 se konfiguracemi a hooky.<\/p>\n<p>Dal\u0161\u00ed zranitelnosti:<\/p>\n<ul>\n<li class=\"l\"> CVE-2026-113408 &#8212; p\u0159\u00edstup mimo hranice adres\u00e1\u0159e refs\/ pomoc\u00ed p\u0159ed\u00e1n\u00ed symbolick\u00e9ho odkazu s hodnotou &#171;refs\/heads\/....\/....\/TARGET&#187; jako v\u011btve HEAD p\u0159i klonov\u00e1n\u00ed pr\u00e1zdn\u00e9ho repozit\u00e1\u0159e pomoc\u00ed protokolu Git v2. P\u0159i n\u00e1sledn\u00e9m proveden\u00ed &#171;git commit&#187; bude vytvo\u0159en soubor TARGET v ko\u0159enov\u00e9m adres\u00e1\u0159i repozit\u00e1\u0159e, kter\u00fd lze vyu\u017e\u00edt k p\u0159eps\u00e1n\u00ed soubor\u016f v repozit\u00e1\u0159i a k proveden\u00ed k\u00f3du.\n<li class=\"l\"> CVE-2026-114467 &#8212; p\u0159ete\u010den\u00ed z\u00e1sobn\u00edku p\u0159i odstra\u0148ov\u00e1n\u00ed GPG podpis\u016f, kter\u00e9 potenci\u00e1ln\u011b m\u016f\u017ee v\u00e9st k vykon\u00e1n\u00ed libovoln\u00e9ho k\u00f3du. Probl\u00e9m je zp\u016fsoben t\u00edm, \u017ee funkce remove_signature() uchov\u00e1v\u00e1 pozice podpis\u016f v pevn\u011b stanoven\u00e9m poli, kter\u00e9 je navr\u017eeno maxim\u00e1ln\u011b na dva podpisy. P\u0159i p\u0159ed\u00e1n\u00ed tagu se t\u0159emi a v\u00edce podpisy se data uchov\u00e1vaj\u00ed mimo pole.\n<li class=\"l\"> CVE-2026-114469 &#8212; p\u0159i kontrole limit\u016f velikosti bin\u00e1rn\u00edch patch\u016f byly zohledn\u011bny \u00fadaje p\u0159ed rozbalen\u00edm komprimovan\u00fdch dat, co\u017e vedlo ke \u010dten\u00ed obsahu z oblasti mimo hranice vyrovn\u00e1vac\u00ed pam\u011bti.\n<li class=\"l\"> CVE-2026-105437 &#8212; po\u0161kozen\u00ed pam\u011bti p\u0159i prov\u00e1d\u011bn\u00ed velk\u00fdch slu\u010dovac\u00edch operac\u00ed v d\u016fsledku kumulace velikosti v\u00fdsledku v poli typu int. V konfiguraci GitLab m\u016f\u017ee b\u00fdt zranitelnost zneu\u017eita k proveden\u00ed k\u00f3du (probl\u00e9m je zablokov\u00e1n v GitLab 19.5.4).\n<li class=\"l\"> CVE-2026-114466 &#8212; p\u0159epis libovoln\u00fdch soubor\u016f v souborov\u00e9m syst\u00e9mu prost\u0159ednictv\u00edm p\u0159\u00edkazu &#171;git fast-import&#187; kv\u016fli nedostate\u010dn\u00e9mu odstran\u011bn\u00ed zranitelnosti CVE-2019-1348.\n<\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=66669\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c \u043a\u043e\u0434\u043e\u043c Git 2.56.1, 2.55.1, 2.54.1, 2.53.1, 2.52.1, 2.51.3 \u0438 2.50.2, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e 6 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-111760) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043a\u043e\u043c\u0430\u043d\u0434\u044b &#171;git clone&#187; \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 &#171;&#8212;recurse-submodules&#187; \u0441 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f\u043c\u0438, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u043c\u0438 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u0434\u043b\u0438\u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u0438 \u0441 \u0438\u043c\u0435\u043d\u0435\u043c \u0432 \u0438\u043d\u0434\u0435\u043a\u0441\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442\u0441\u044f \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-184239","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c \u043a\u043e\u0434\u043e\u043c Git 2.56.1, 2.55.1, 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