{"id":184060,"date":"2026-10-31T23:40:47","date_gmt":"2026-10-31T21:40:47","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/detali-vozmozhnoj-ataki-na-gnu-savannah-pozvolyavshej-skomprometirovat-repozitorii-bash-i-coreutils"},"modified":"2026-10-31T23:40:51","modified_gmt":"2026-10-31T21:40:51","slug":"details-of-a-potential-attack-on-gnu-savannah-that-could-have-compromised-bash-and-coreutils-repositories","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/details-of-a-potential-attack-on-gnu-savannah-that-could-have-compromised-bash-and-coreutils-repositories","title":{"rendered":"Detaily mo\u017en\u00e9ho \u00fatoku na GNU Savannah, ktor\u00fd umo\u017enil skompromitova\u0165 repozit\u00e1re Bash a Coreutils","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spolo\u010dnos\u0165 Hacktron zverejnila podrobnosti o demon\u0161tra\u010dnom \u00fatoku na hosting vo\u013en\u00e9ho k\u00f3du GNU Savannah, ktor\u00fd sa na\u010falej pou\u017e\u00edva na v\u00fdvoj niektor\u00fdch n\u00e1strojov GNU, vr\u00e1tane Bash a Coreutils. V r\u00e1mci vykonan\u00e9ho experimentu sa podarilo vykona\u0165 k\u00f3d na serveri GNU Savannah, z\u00edska\u0165 na \u0148om pr\u00e1va root, vymeni\u0165 SSH k\u013e\u00fa\u010de spr\u00e1vcovia Bash, odhali\u0165 mo\u017enos\u0165 vykona\u0165 zmeny v hlavnom git repozit\u00e1ri projektu Bash a z\u00edska\u0165 pr\u00edstup k serveru s z\u00e1lo\u017en\u00fdmi k\u00f3piami.<\/p>\n

O vykonanom testovacom \u00fatoku a zisten\u00fdch probl\u00e9moch bolo okam\u017eite informovan\u00e9 vedenie GNU Savannah. Probl\u00e9my boli odstr\u00e1nen\u00e9 v m\u00e1ji. V\u00fdskumn\u00edci identifikovali 9 zranite\u013enost\u00ed, z ktor\u00fdch 2 boli pova\u017eovan\u00e9 za kritick\u00e9 a 4 za nebezpe\u010dn\u00e9. Prv\u00e1 kritick\u00e1 zranite\u013enos\u0165 umo\u017enila ob\u00eds\u0165 autentifik\u00e1ciu pri pr\u00edstupe k nastaveniam, ktor\u00e9 s\u00fa dostupn\u00e9 len administr\u00e1torovi webu (siteadmin\/triggercreation.php).<\/p>\n

Druh\u00e1 kritick\u00e1 zranite\u013enos\u0165 umo\u017enila vykona\u0165 k\u00f3d na serveri<\/a> prostredn\u00edctvom zadan\u00e9ho \u0161peci\u00e1lneho emailu. Probl\u00e9m bol sp\u00f4soben\u00fd nedostatkom riadneho escapingu \u0161peci\u00e1lnych znakov a mohol by\u0165 zneu\u017eit\u00fd prostredn\u00edctvom registr\u00e1cie emailu vo forme «a`touch${IFS}\\\/tmp\\\/savane-rce-proof`@example.com» so n\u00e1sledn\u00fdm stla\u010den\u00edm tla\u010didla na kontrolu GPG k\u013e\u00fa\u010da v webovom rozhran\u00ed (email bol zadan\u00fd do sp\u00fa\u0161\u0165acej linky n\u00e1stroja gpg, volan\u00e9ho cez PHP funkciu proc_open()). <\/p>\n

Po dosiahnut\u00ed vykonania k\u00f3du s pr\u00e1vami webov\u00e9ho servera na\u0161li v\u00fdskumn\u00edci heslo k datab\u00e1ze v konfigura\u010dnom s\u00fabore a zmenili v datab\u00e1ze pr\u00edstupov\u00e9 pr\u00e1va pre svoj registrovan\u00fd \u00fa\u010det z nep\u0159ivilegovan\u00e9ho pou\u017e\u00edvate\u013ea na administr\u00e1tora. Pr\u00e1va administr\u00e1tora v webovom rozhran\u00ed Savannah umo\u017e\u0148ovali pr\u00e1cu ak\u00fdmko\u013evek pou\u017e\u00edvate\u013eom bez zadania hesla. V\u00fdskumn\u00edci t\u00fato mo\u017enos\u0165 vyu\u017eili, prihl\u00e1sili sa ako spr\u00e1vcovia projektu Bash a na\u0161li mo\u017enos\u0165 prida\u0165 si svoj SSH k\u013e\u00fa\u010d na pripojenie k git repozit\u00e1ru. V pr\u00edpade pridania k\u013e\u00fa\u010da sa otvorila mo\u017enos\u0165 posiela\u0165 commity do Bash menom spr\u00e1vcov.<\/p>\n

Pr\u00e1va root na serveri boli z\u00edskan\u00e9 prostredn\u00edctvom zneu\u017eitia u\u017e predt\u00fdm zn\u00e1mej zranite\u013enosti v jadre Linuxu, ktor\u00e9 nebolo na serveri aktualizovan\u00e9 (bol nain\u0161talovan\u00fd distrib\u00fator Trisquel GNU\/Linux 11 zalo\u017een\u00fd na
\nUbuntu 22.04 s jadrom linux-libre 5.15). Na \u00fatok sa vyu\u017e\u00edvala zranite\u013enos\u0165 v OverlayFS (CVE-2023-2640). Zauj\u00edmav\u00e9 je, \u017ee oprava zranite\u013enosti bola k dispoz\u00edcii u\u017e od roku 2023, av\u0161ak spolo\u010dnos\u0165 Canonical r\u00fdchlo odstr\u00e1nila probl\u00e9m iba v jadr\u00e1ch 5.19 a 6.2, zatia\u013e \u010do pre jadro 5.15 vydala patch a\u017e 7. m\u00e1ja 2026. Po z\u00edskan\u00ed pr\u00e1v root v\u00fdskumn\u00edci odhalili v syst\u00e9me SSH k\u013e\u00fa\u010d pou\u017e\u00edvate\u013ea «gnubackup», ktor\u00fd umo\u017e\u0148uje pripojenie k hostite\u013eovi s rezervn\u00fdmi k\u00f3piami bez hesla.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Hacktron \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0430 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 GNU Savannah, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u043e\u0432 GNU, \u0432\u043a\u043b\u044e\u0447\u0430\u044f Bash \u0438 Coreutils. \u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u0440\u043e\u0432\u0435\u0434\u0451\u043d\u043d\u043e\u0433\u043e \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430 \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435 GNU Savannah, \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043d\u0430 \u043d\u0451\u043c \u043f\u0440\u0430\u0432\u0430 root, \u0437\u0430\u043c\u0435\u043d\u0438\u0442\u044c SSH-\u043a\u043b\u044e\u0447\u0438 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0430\u044e\u0449\u0435\u0433\u043e Bash, \u0432\u044b\u044f\u0432\u0438\u0442\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 git-\u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Bash \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c […]<\/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-184060","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\n","aioseo_head_json":{"title":"\ud83e\udd47Detaily mo\u017en\u00e9ho \u00fatoku na GNU Savannah, ktor\u00fd umo\u017enil skompromitova\u0165 repozit\u00e1re Bash a Coreutils | ProHoster","description":"Spolo\u010dnos\u0165 Hacktron odhalila podrobnosti demon\u0161tra\u010dn\u00e9ho \u00fatoku na hosting slobodn\u00e9ho k\u00f3du GNU Savannah, ktor\u00fd sa na\u010falej 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