{"id":184006,"date":"2026-10-26T23:40:43","date_gmt":"2026-10-26T21:40:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/ataka-na-ai-agenty-cherez-razmeshhenie-fajla-agents-md-v-kataloge-s-zagruzkami"},"modified":"2026-10-26T23:40:47","modified_gmt":"2026-10-26T21:40:47","slug":"attacking-ai-agents-by-placing-an-agents-md-file-in-the-downloads-directory","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/attacking-ai-agents-by-placing-an-agents-md-file-in-the-downloads-directory","title":{"rendered":"\u00datok na AI agenty prost\u0159ednictv\u00edm um\u00edst\u011bn\u00ed souboru AGENTS.md do slo\u017eky s ke sta\u017een\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci ze spole\u010dnosti Forever Security p\u0159i zkoum\u00e1n\u00ed p\u0159\u00ed\u010din vzniku malwaru v syst\u00e9mu jednoho z klient\u016f zjistili nov\u00fd zp\u016fsob \u00fatoku na AI agenty, zalo\u017een\u00fd na tom, \u017ee mnoz\u00ed AI agenti ve v\u00fdchoz\u00edm nastaven\u00ed zpracov\u00e1vaj\u00ed pokyny z souboru AGENTS.md um\u00edst\u011bn\u00e9ho v ko\u0159enov\u00e9m adres\u00e1\u0159i projektu, na jeho\u017e pr\u00e1ci jsou zapojeni. \u00datok se prov\u00e1d\u00ed prost\u0159ednictv\u00edm um\u00edst\u011bn\u00ed souboru AGENTS.md nebo CLAUDE.md do adres\u00e1\u0159e ~\\\/Downloads s pokyny pro instalaci malwaru (v tomto p\u0159\u00edpad\u011b byl instalov\u00e1n \u0161kodliv\u00fd npm bal\u00ed\u010dek \u201efunction-color\u201c). <\/p>\n

Identifikovan\u00e1 aktivita je variac\u00ed zn\u00e1m\u00e9 metody \u00fatoku na v\u00fdvoj\u00e1\u0159e softwaru, kdy \u00fato\u010dn\u00edk vytv\u00e1\u0159\u00ed repozit\u00e1\u0159 s legitimn\u00edm k\u00f3dem a vkl\u00e1d\u00e1 do n\u011bj soubor AGENTS.md, nebo tento soubor p\u0159ed\u00e1v\u00e1 v r\u00e1mci pull request\u016f nebo chybov\u00fdch zpr\u00e1v do st\u00e1vaj\u00edc\u00edch projekt\u016f. Pokud se n\u011bkdo rozhodne pou\u017e\u00edt AI agenta k kontrole navrhovan\u00e9ho repozit\u00e1\u0159e nebo zm\u011bny, agent zpracuje instrukce ze souboru AGENTS.md, v n\u011bm\u017e mohou b\u00fdt p\u0159edeps\u00e1ny \u0161kodliv\u00e9 akce.<\/p>\n

Nov\u00e1 varianta \u00fatoku vych\u00e1z\u00ed z toho, \u017ee Chrome, Firefox a Edge ve v\u00fdchoz\u00edm nastaven\u00ed nevy\u017eaduj\u00ed potvrzen\u00ed p\u0159i stahov\u00e1n\u00ed souboru, ale pouze zobrazuj\u00ed ozn\u00e1men\u00ed. Soubory stahovan\u00e9 prost\u0159ednictv\u00edm odkazu se automaticky ukl\u00e1daj\u00ed do adres\u00e1\u0159e ~\\\/Downloads \u2014 pro sta\u017een\u00ed sta\u010d\u00ed, aby u\u017eivatel otev\u0159el ur\u010ditou str\u00e1nku nebo kliknul na odkaz (odkaz m\u016f\u017ee vypadat nevinn\u011b a p\u0159esm\u011brov\u00e1n\u00ed na stahov\u00e1n\u00ed m\u016f\u017ee b\u00fdt provedeno pomoc\u00ed p\u0159esm\u011brov\u00e1n\u00ed). T\u00edmto zp\u016fsobem \u00fato\u010dn\u00edci zajist\u00ed ulo\u017een\u00ed souboru AGENTS.md do adres\u00e1\u0159e stahov\u00e1n\u00ed na syst\u00e9mech u\u017eivatel\u016f, po \u010dem\u017e \u010dekaj\u00ed, a\u017e u\u017eivatel spust\u00ed AI agenta v kontextu adres\u00e1\u0159e ~\\\/Downloads, nap\u0159\u00edklad pro anal\u00fdzu n\u011bjak\u00fdch sta\u017een\u00fdch dokument\u016f.<\/p>\n

Krom\u011b pou\u017e\u00edv\u00e1n\u00ed AGENTS.md pro informov\u00e1n\u00ed AI agent\u016f o pou\u017e\u00edvan\u00fdch n\u00e1stroj\u00edch, po\u017eadovan\u00fdch z\u00e1vislostech a prov\u00e1d\u011bn\u00fdch testech, lze pomoc\u00ed takov\u00fdch soubor\u016f dos\u00e1hnout prov\u00e1d\u011bn\u00ed libovoln\u00fdch program\u016f, instalace extern\u00edch bal\u00ed\u010dk\u016f a zm\u011bny konfigurace. Mo\u017enost prov\u00e1d\u011bn\u00ed \u00fatoku byla demonstrov\u00e1na pro AI agenty Codex a Claude Code. <\/p>\n

V\u011bdci provedli dva experimenty, d\u00edky kter\u00fdm z\u00edskali kontrolu nad u\u017eivatelsk\u00fdm \u00fa\u010dtem a odchytli jeho OAuth tokeny. V prvn\u00edm experimentu AI agent Codex splnil pokyny ke sta\u017een\u00ed a spu\u0161t\u011bn\u00ed testovac\u00edho \u0161kodliv\u00e9ho k\u00f3du na u\u017eivatelov\u011b syst\u00e9mu, kter\u00fd se omezoval na otev\u0159en\u00ed kalkula\u010dky. Ve druh\u00e9m experimentu pomoc\u00ed nahrazen\u00ed souboru CLAUDE.md v\u011bdci prost\u0159ednictv\u00edm Claude Code zm\u011bnili obsah prom\u011bnn\u00e9 prost\u0159ed\u00ed ANTHROPIC_BASE_URL a uspo\u0159\u00e1dali p\u0159esm\u011brov\u00e1n\u00ed po\u017eadavk\u016f na API na sv\u016fj server<\/a> a zachytili token OAuth. Prvn\u00ed experiment byl \u00fasp\u011b\u0161n\u00fd v 90 % pokus\u016f, a druh\u00fd \u2014 v 50 %.<\/p>\n


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

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\u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e\u0442 \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 \u0438\u0437 \u0444\u0430\u0439\u043b\u0430 AGENTS.md, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u043e\u0433\u043e \u0432 \u043a\u043e\u0440\u043d\u0435 \u043f\u0440\u043e\u0435\u043a\u0442\u0430, \u043a \u0440\u0430\u0431\u043e\u0442\u0435 \u043d\u0430\u0434 \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u043e\u043d\u0438 \u043f\u0440\u0438\u0432\u043b\u0435\u0447\u0435\u043d\u044b. \u0410\u0442\u0430\u043a\u0430 \u043f\u0440\u043e\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0447\u0435\u0440\u0435\u0437 \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u0432 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0435 ~\/Downloads \u0444\u0430\u0439\u043b\u0430 AGENTS.md \u0438\u043b\u0438 CLAUDE.md 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