A GNU screen, amely egy t\u00f6bbablakos konzolkezel\u0151 (termin\u00e1lmultiplexor), 5 sebezhet\u0151s\u00e9get t\u00e1r fel. A legvesz\u00e9lyesebb probl\u00e9ma (CVE-2025-23395) lehet\u0151v\u00e9 teszi a root jogosults\u00e1gok megszerz\u00e9s\u00e9t a rendszeren. A jav\u00edt\u00e1s ma megjelent screen 5.0.1 verzi\u00f3ba be\u00e9p\u00edtve ker\u00fclt. <\/p>\n
A CVE-2025-23395 sebezhet\u0151s\u00e9g csak a Fedora Linux, Arch Linux, NetBSD, OpenBSD \u00e9s Alpine rendszerekben el\u00e9rhet\u0151 screen 5.0.0 \u00e1gon jelentkezik. A Debian, Ubuntu, RHEL (EPEL 9), Gentoo, FreeBSD, SUSE\/openSUSE \u00e9s OpenWrt rendszerben tov\u00e1bbra is a 4.x \u00e1gat haszn\u00e1lj\u00e1k. A sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1sa lehets\u00e9ges olyan rendszereken, ahol a screen v\u00e9grehajthat\u00f3 f\u00e1jl setuid root z\u00e1szl\u00f3val van telep\u00edtve, p\u00e9ld\u00e1ul Arch Linux \u00e9s NetBSD alatt. A Fedora eset\u00e9ben a seg\u00e9dprogram setgid z\u00e1szl\u00f3val van telep\u00edtve, amely lehet\u0151v\u00e9 teszi a screen csoport jogainak megszerz\u00e9s\u00e9t, \u00edgy a socketek elhelyezhet\u0151k a \/run\/screen rendszerk\u00f6nyvt\u00e1rban, ami korl\u00e1tozza a szolg\u00e1ltat\u00e1smegtagad\u00e1sos t\u00e1mad\u00e1s lehet\u0151s\u00e9geit. <\/p>\n
A sebezhet\u0151s\u00e9g abb\u00f3l ad\u00f3dik, hogy root jogosults\u00e1gokkal t\u00f6rt\u00e9n\u0151 ind\u00edt\u00e1skor a logfile_reopen() funkci\u00f3 a jogosults\u00e1gok vissza\u00e1ll\u00edt\u00e1sa el\u0151tt hajt\u00f3dik v\u00e9gre, de a nem privil\u00e9giz\u00e1lt felhaszn\u00e1l\u00f3, aki elind\u00edtotta a screen-t, aktu\u00e1lis k\u00f6nyvt\u00e1rainak kontextus\u00e1ban dolgozik fel adatokat. \u00c9rdekes, hogy a napl\u00f3 kezdeti megnyit\u00e1sa megfelel\u0151 jogosults\u00e1g-vissza\u00e1ll\u00edt\u00e1ssal t\u00f6rt\u00e9nik, de amikor a napl\u00f3f\u00e1jlt \u00fajra megnyitj\u00e1k, a jogosults\u00e1g-vissza\u00e1ll\u00edt\u00e1s nem t\u00f6rt\u00e9nik meg. <\/p>\n
A felhaszn\u00e1l\u00f3 a napl\u00f3z\u00e1si m\u00f3d aktiv\u00e1l\u00e1s\u00e1nak manipul\u00e1l\u00e1s\u00e1val el\u00e9rheti, hogy az adatok root jogokkal f\u00e1jlba ker\u00fcljenek, mik\u00f6zben a f\u00e1jl a felhaszn\u00e1l\u00f3 otthoni k\u00f6nyvt\u00e1r\u00e1ban is menthet\u0151. A t\u00e1mad\u00e1s l\u00e9nyeg\u00e9ben a l\u00e9trehozott napl\u00f3f\u00e1jl t\u00f6rl\u00e9s\u00e9re \u00e9s egy szimbolikus hivatkoz\u00e1sra val\u00f3 cser\u00e9j\u00e9re korl\u00e1toz\u00f3dik, amely b\u00e1rmely f\u00e1jlra mutat a rendszeren. Ha a f\u00e1jl m\u00e1r l\u00e9tezik, akkor an\u00e9lk\u00fcl, hogy megv\u00e1ltoztatn\u00e1nk a tulajdonost, az adatokat a k\u00e9perny\u0151n akt\u00edv \u00fcl\u00e9s tartalm\u00e1val hozz\u00e1adj\u00e1k. Ha a f\u00e1jl nem l\u00e9tezik \u2014 0644 jogokkal l\u00e9trehozz\u00e1k, a tulajdonos root \u00e9s a csoport megegyezik a jelenlegi felhaszn\u00e1l\u00f3\u00e9val. <\/p>\n
A t\u00e1mad\u00e1s algoritmusa, amely l\u00e9trehozza a f\u00e1jlt \/etc\/profile.d\/exploit.sh a \"chown $USER \/root\" paranccsal: <\/p>\n
Kev\u00e9sb\u00e9 vesz\u00e9lyes sebezhet\u0151s\u00e9gek a screen-ben: <\/p>\n
A sebezhet\u0151s\u00e9geket a GNU screen k\u00f3dalap auditja sor\u00e1n fedezt\u00e9k fel, amelyet a SUSE Linux disztrib\u00faci\u00f3 biztons\u00e1g\u00e1\u00e9rt felel\u0151s csapat v\u00e9gzett. A screen fejleszt\u0151inek a sebezhet\u0151s\u00e9gekr\u0151l febru\u00e1r 7-\u00e9n k\u00fcldtek \u00e9rtes\u00edt\u00e9st, de a rendelkez\u00e9sre \u00e1ll\u00f3 90 napon bel\u00fcl nem tudt\u00e1k mindegyik sebezhet\u0151s\u00e9gre kiadni a jav\u00edt\u00e1st, \u00edgy a SUSE munkat\u00e1rsainak n\u00e9h\u00e1ny jav\u00edt\u00e1st maguknak kellett elk\u00e9sz\u00edteni\u00fck. Az auditot v\u00e9gz\u0151 kutat\u00f3k v\u00e9lem\u00e9nye szerint a GNU screen jelenlegi fenntart\u00f3i nem b\u00edrnak el\u00e9gs\u00e9ges ismeretekkel a projekt k\u00f3dalapj\u00e1r\u00f3l, \u00e9s nem k\u00e9pesek teljes m\u00e9rt\u00e9kben megoldani a felfedezett biztons\u00e1gi probl\u00e9m\u00e1kat. \u0412 \u043a\u043e\u043d\u0441\u043e\u043b\u044c\u043d\u043e\u043c \u043e\u043a\u043e\u043d\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 (\u043c\u0443\u043b\u044c\u0442\u0438\u043f\u043b\u0435\u043a\u0441\u043e\u0440\u0435 \u0442\u0435\u0440\u043c\u0438\u043d\u0430\u043b\u043e\u0432) GNU screen, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u043c\u043d\u043e\u0433\u043e\u043e\u043a\u043e\u043d\u043d\u044b\u0439 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 \u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e 5 \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 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 (CVE-2025-23395) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0432\u044b\u043a\u043b\u044e\u0447\u0435\u043d\u043e \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0441\u0435\u0433\u043e\u0434\u043d\u044f\u0448\u043d\u0435\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 screen 5.0.1. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CVE-2025-23395 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0435\u0442\u043a\u0435 screen 5.0.0, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 Fedora Linux, Arch Linux, NetBSD, OpenBSD \u0438 Alpine. \u0412 Debian, […]<\/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-124670","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\udd47Sebezhet\u0151s\u00e9g a GNU screen-ben, amely lehet\u0151v\u00e9 teszi a root jogosults\u00e1g\u00fa k\u00f3d v\u00e9grehajt\u00e1s\u00e1t | ProHoster","description":"A GNU screen konzolos ablakkezel\u0151j\u00e9ben (termin\u00e1l multiplexor\u00e1ban), amely 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Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"