{"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\/cs\/blog\/news\/details-of-a-potential-attack-on-gnu-savannah-that-could-have-compromised-bash-and-coreutils-repositories","title":{"rendered":"Podrobnosti o mo\u017en\u00e9 \u00fatoku na GNU Savannah, kter\u00fd umo\u017enil kompromitaci repozit\u00e1\u0159\u016f Bash a Coreutils","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spole\u010dnost Hacktron zve\u0159ejnila podrobnosti o demonstra\u010dn\u00edm \u00fatoku na hosting voln\u00e9ho k\u00f3du GNU Savannah, kter\u00fd je st\u00e1le pou\u017e\u00edv\u00e1n pro v\u00fdvoj n\u011bkter\u00fdch n\u00e1stroj\u016f GNU, v\u010detn\u011b Bash a Coreutils. V r\u00e1mci proveden\u00e9ho experimentu se poda\u0159ilo vykonat k\u00f3d na serveru GNU Savannah, z\u00edskat na n\u011bm pr\u00e1va root, vym\u011bnit SSH kl\u00ed\u010de doprov\u00e1zej\u00edc\u00edho Bash, odhalit mo\u017enost prov\u00e1d\u011bn\u00ed zm\u011bn v hlavn\u00edm git repozit\u00e1\u0159i projektu Bash a z\u00edskat p\u0159\u00edstup k serveru s z\u00e1lohami.<\/p>\n

O proveden\u00e9m testovac\u00edm \u00fatoku a zji\u0161t\u011bn\u00fdch probl\u00e9mech bylo ihned informov\u00e1no veden\u00ed GNU Savannah. Probl\u00e9my byly vy\u0159e\u0161eny v kv\u011btnu. Celkem v\u011bdci odhalili 9 zranitelnost\u00ed, z nich\u017e 2 byly ozna\u010deny za kritick\u00e9 a 4 za nebezpe\u010dn\u00e9. Prvn\u00ed kritick\u00e1 zranitelnost umo\u017e\u0148ovala obej\u00edt autentizaci p\u0159i p\u0159\u00edstupu k nastaven\u00edm, kter\u00e9 jsou dostupn\u00e9 pouze administr\u00e1torovi webu (siteadmin\/triggercreation.php).<\/p>\n

Druh\u00e1 kritick\u00e1 zranitelnost umo\u017enila vykonat k\u00f3d na serveru<\/a> p\u0159edlo\u017een\u00edm speci\u00e1ln\u011b vytvo\u0159en\u00e9ho emailu. Probl\u00e9m byl zp\u016fsoben nedostate\u010dn\u00fdm escapov\u00e1n\u00edm speci\u00e1ln\u00edch znak\u016f a mohl b\u00fdt zneu\u017eit p\u0159i registraci emailu ve form\u00e1tu «a`touch${IFS}\\\/tmp\\\/savane-rce-proof`@example.com», s n\u00e1sledn\u00fdm kliknut\u00edm v webov\u00e9m rozhran\u00ed na tla\u010d\u00edtko pro ov\u011b\u0159en\u00ed GPG kl\u00ed\u010de (email byl vlo\u017een do p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku n\u00e1stroje gpg, vyvol\u00e1van\u00e9ho pomoc\u00ed PHP funkce proc_open()). <\/p>\n

Jakmile se poda\u0159ilo vykonat k\u00f3d s pr\u00e1vy webov\u00e9ho serveru, v\u00fdzkumn\u00edci na\u0161li heslo pro p\u0159\u00edstup k datab\u00e1zi v konfigura\u010dn\u00edm souboru a zm\u011bnili v datab\u00e1zi p\u0159\u00edstupov\u00e1 pr\u00e1va sv\u00e9ho registrovan\u00e9ho \u00fa\u010dtu z nep\u0159ev\u00fd\u0161en\u00e9ho u\u017eivatele na administr\u00e1tora. Pr\u00e1va administr\u00e1tora v webov\u00e9m rozhran\u00ed Savannah umo\u017e\u0148ovala pr\u00e1ci pod jak\u00fdmkoli u\u017eivatelsk\u00fdm \u00fa\u010dtem bez zad\u00e1n\u00ed hesla. V\u00fdzkumn\u00edci vyu\u017eili t\u00e9to mo\u017enosti, p\u0159ihl\u00e1sili se pod jm\u00e9nem doprov\u00e1zej\u00edc\u00edho projektu Bash a zjistili, \u017ee mohou p\u0159idat sv\u016fj SSH kl\u00ed\u010d pro p\u0159ipojen\u00ed k git repozit\u00e1\u0159i. P\u0159i p\u0159id\u00e1n\u00ed kl\u00ed\u010de se objevila mo\u017enost odes\u00edlat commity do Bash jm\u00e9nem doprov\u00e1zej\u00edc\u00edho.<\/p>\n

Pr\u00e1va root na serveru byla z\u00edsk\u00e1na prost\u0159ednictv\u00edm zneu\u017eit\u00ed ji\u017e zn\u00e1m\u00e9 zranitelnosti v j\u00e1d\u0159e Linuxu, kter\u00e9 nebylo na serveru aktualizov\u00e1no (byla nainstalov\u00e1na distribuce Trisquel GNU\/Linux 11 na b\u00e1zi
\nUbuntu 22.04 s j\u00e1drem linux-libre 5.15). Pro \u00fatok byla vyu\u017eita zranitelnost v OverlayFS (CVE-2023-2640). Je pozoruhodn\u00e9, \u017ee oprava zranitelnosti byla dostupn\u00e1 od roku 2023, ale spole\u010dnost Canonical probl\u00e9m rychle vy\u0159e\u0161ila pouze v j\u00e1drech 5.19 a 6.2, zat\u00edmco pro j\u00e1dro 5.15 vydala opravu a\u017e 7. kv\u011btna 2026. Po z\u00edsk\u00e1n\u00ed pr\u00e1v root v\u00fdzkumn\u00edci objevili v syst\u00e9mu SSH kl\u00ed\u010d u\u017eivatele «gnubackup», kter\u00fd umo\u017e\u0148oval bez hesla p\u0159ipojit se k hostiteli s rezervn\u00edmi kopiemi.
\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\u00e9 \u00fatoku na GNU Savannah, kter\u00fd umo\u017enil zkompromitovat repozit\u00e1\u0159e Bash a Coreutils | ProHoster","description":"Spole\u010dnost Hacktron odhalila podrobnosti o demonstra\u010dn\u00edm \u00fatoku na hosting voln\u00e9ho k\u00f3du GNU Savannah, kter\u00fd se st\u00e1le 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