{"id":124670,"date":"2025-05-13T03:05:07","date_gmt":"2025-05-13T01:05:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-gnu-screen-pozvolyayushhaya-vypolnit-kod-s-pravami-root"},"modified":"2025-05-13T03:05:07","modified_gmt":"2025-05-13T01:05:07","slug":"uyazvimost-v-gnu-screen-pozvolyayushhaya-vypolnit-kod-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-gnu-screen-pozvolyayushhaya-vypolnit-kod-s-pravami-root","title":{"rendered":"Haavatavus GNU screen'is, mis v\u00f5imaldab k\u00e4itada koodi root \u00f5igustes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>GNU screeni konsooliakna halduris (terminalide multiplexer), mis pakub konsoolis mitmeakenlist kasutajaliidest, on tuvastatud 5 haavatavust. K\u00f5ige ohtlikum probleem (CVE-2025-23395) v\u00f5imaldab saada root \u00f5igusi s\u00fcsteemis. Parandus on v\u00e4lja antud t\u00e4nase screeni 5.0.1 versiooniga.      <\/p>\n<p>CVE-2025-23395 haavatavus esineb ainult screeni 5.0.0 versioonis, mida tarnitakse Fedora Linuxis, Arch Linuxis, NetBSD-s, OpenBSD-s ja Alpine-s. Debianis, Ubuntu-s, RHEL-is (EPEL 9), Gentoo-s, FreeBSD-s, SUSE\/openSUSE-s ja OpenWrt-s tarnitakse endiselt screeni 4.x versioon. Haavatavuse \u00e4ra kasutamine on v\u00f5imalik s\u00fcsteemides, kus t\u00e4itmisfail screeni installitakse setuid root lipuga, n\u00e4iteks Arch Linuxis ja NetBSD-s. Fedoras installeeritakse utiliit setgid lipuga screeni r\u00fchma \u00f5iguste saamiseks, mis v\u00f5imaldab luua sokette s\u00fcsteemi kataloogis \/run\/screen, piirates teenuse katkestamise r\u00fcnnaku v\u00f5imalusi.       <\/p>\n<p>Haavatavuse p\u00f5hjustab see, et running root \u00f5igustega funktsioon logfile_reopen() k\u00e4ivitatakse enne \u00f5iguste t\u00fchistamist, kuid t\u00f6\u00f6tleb andmeid k\u00e4esoleva mitteprivileegitud kasutaja kontekstis, kes screeni k\u00e4ivitas. Oluline on, et logi algne avamine toimub korrektsete \u00f5iguste t\u00fchistamisega, kuid logifaili uuesti avamisel \u00f5iguste t\u00fchistamist ei toimu.    <\/p>\n<p>\u0427\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u0440\u0435\u0436\u0438\u043c\u0430 \u0436\u0443\u0440\u043d\u0430\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0441\u0435\u0430\u043d\u0441\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0444\u0430\u0439\u043b \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root, \u043f\u0440\u0438 \u0442\u043e\u043c, \u0447\u0442\u043e \u0441\u0430\u043c \u0444\u0430\u0439\u043b \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0445\u0440\u0430\u043d\u0451\u043d \u0432 \u0434\u043e\u043c\u0430\u0448\u043d\u0435\u043c \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f. \u0410\u0442\u0430\u043a\u0430 \u0441\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043a \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044e \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430 \u0441 \u043b\u043e\u0433\u043e\u043c \u0438 \u0435\u0433\u043e \u0437\u0430\u043c\u0435\u043d\u0435 \u043d\u0430 \u0441\u0438\u043c\u0432\u043e\u043b\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0441\u0441\u044b\u043b\u043a\u0443, \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u044e\u0449\u0443\u044e \u043d\u0430 \u043b\u044e\u0431\u043e\u0439 \u0444\u0430\u0439\u043b \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0415\u0441\u043b\u0438 \u0444\u0430\u0439\u043b \u0443\u0436\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043d\u0435\u0433\u043e \u0431\u0435\u0437 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432\u043b\u0430\u0434\u0435\u043b\u044c\u0446\u0430 \u0431\u0443\u0434\u0443\u0442 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u044b \u0434\u0430\u043d\u043d\u044b\u0435 \u0441 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u044b\u043c \u044d\u043a\u0440\u0430\u043d\u0430 \u0432 \u0441\u0435\u0430\u043d\u0441\u0435 screen. \u0415\u0441\u043b\u0438 \u0444\u0430\u0439\u043b \u043d\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 &#8212; \u043e\u043d \u0431\u0443\u0434\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u043d \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 0644, \u0432\u043b\u0430\u0434\u0435\u043b\u044c\u0446\u0435\u043c root \u0438 \u0433\u0440\u0443\u043f\u043f\u043e\u0439 \u043a\u0430\u043a \u0443 \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f.    <\/p>\n<p>\u0410\u043b\u0433\u043e\u0440\u0438\u0442\u043c \u0430\u0442\u0430\u043a\u0438, \u0441\u043e\u0437\u0434\u0430\u044e\u0449\u0435\u0439 \u0444\u0430\u0439\u043b \/etc\/profile.d\/exploit.sh \u0441 \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439 &#171;chown $USER \/root&#187;:  <\/p>\n<ul>\n<li class=\"l\"> Screeni seansi loomine logimise lubamisega $ screen -Logfile $HOME\/screen.log\n<li class=\"l\"> Klaviatuuri kombinatsiooni Ctrl-a-H vajutamine logimise lubamiseks.\n<li class=\"l\"> Logifaili eemaldamine ja selle asendamine s\u00fcmboolse lingiga, mis viib faili \/etc\/profile.d\/exploit.sh loomisele $ rm $HOME\/screen.log; ln -s \/etc\/profile.d\/exploit.sh $HOME\/screen.log\n<li class=\"l\"> \u0412\u043e\u0437\u0432\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u0432 \u0441\u0435\u0430\u043d\u0441 screen \u0438 \u0432\u044b\u0432\u043e\u0434 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d \u0434\u0430\u043d\u043d\u044b\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0431\u0443\u0434\u0443\u0442 \u0437\u0430\u043f\u0438\u0441\u0430\u043d\u044b \u0432 \u0444\u0430\u0439\u043b \u0441 \u043b\u043e\u0433\u043e\u043c.       $ echo -e &#171;&#92;nchown $USER \/root;&#187;\n<li class=\"l\"> \u041f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e \u043a\u0430\u043a \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u0441\u044f \u0440\u0435\u0430\u043b\u044c\u043d\u044b\u0439 root, \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u0441\u044f \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439 \/etc\/profile.d\/exploit.sh, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u043c\u0435\u043d\u044f\u0435\u0442 \u0432\u043b\u0430\u0434\u0435\u043b\u044c\u0446\u0430 \u0434\u043b\u044f \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430 \/root.       $ ls -lhd \/root     drwxr-x&#8212; 5 user root 4.0K Dec 30  2020 .\n<li class=\"l\"> Sarnastena on v\u00f5imalik luua sudo konfiguratsioonifailid v\u00f5i lisada k\u00e4sud s\u00fcsteemsete skriptide l\u00f5ppu.    <\/ul>\n<p>V\u00e4hem ohtlikud haavatavused screenis:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2025-46802 &#8212; \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 TTY  \u0432 \u043c\u043d\u043e\u0433\u043e\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u0441\u0435\u0430\u043d\u0441\u0430\u0445 (\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \/dev\/pts\/1 \u043f\u0440\u0430\u0432 crw-rw-rw-). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0432\u0435\u0442\u043a\u0430\u0445 screen 4.x \u0438 5.x.\n<li class=\"l\"> CVE-2025-46803 &#8212; \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043f\u0440\u0430\u0432 0622 \u043d\u0430 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e PTY, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0438\u0445 \u0437\u0430\u043f\u0438\u0441\u044c \u043b\u044e\u0431\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0435\u0442\u043a\u0435 screen 5.0.\n<li class=\"l\"> CVE-2025-46804 &#8212; \u0443\u0442\u0435\u0447\u043a\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u0444\u0430\u0439\u043b\u043e\u0432 \u0438 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u043e\u0432 \u0432 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430\u0445 (\u043f\u0440\u0438 \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u0438 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430 \u0434\u043b\u044f \u0441\u043e\u043a\u0435\u0442\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f SCREENDIR, \u0443\u0442\u0438\u043b\u0438\u0442\u0430 \u0432\u044b\u0434\u0430\u0451\u0442 \u0440\u0430\u0437\u043d\u044b\u0435 \u0442\u0435\u043a\u0441\u0442\u044b \u043e\u0448\u0438\u0431\u043e\u043a, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0441\u0443\u0442\u044c \u043e \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u0444\u0430\u0439\u043b\u043e\u0432 \u0438 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u043e\u0432 \u0441 \u0434\u0430\u043d\u043d\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0432\u0435\u0442\u043a\u0430\u0445 screen 4.x \u0438 5.x.\n<li class=\"l\"> CVE-2025-46805 &#8212; \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0433\u043e\u043d\u043a\u0438 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 \u0441\u0438\u0433\u043d\u0430\u043b\u043e\u0432 SIGCONT \u0438 SIGHUP, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0435 \u043a \u043e\u0442\u043a\u0430\u0437\u0443 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0432\u0435\u0442\u043a\u0430\u0445 screen 4.x \u0438 5.x.\n<li class=\"l\"> \u041d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438  strncpy (\u0437\u0430\u043c\u0435\u043d\u0430 strcpy \u043d\u0430  strncpy \u0431\u0435\u0437 \u0443\u0447\u0451\u0442\u0430 \u0440\u0430\u0437\u043d\u0438\u0446\u044b \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043d\u0443\u043b\u0435\u0432\u044b\u0445 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 &#171;&#92;0&#187;), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0435 \u043a \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u043c\u0443 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044e \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u0430\u043d\u0434. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0435\u0442\u043a\u0435 screen 5.0.  <\/ul>\n<p>Haavatavused tuvastati GNU screeni koodibaasi auditi k\u00e4igus, mille viis l\u00e4bi SUSE Linuxi jaotise turvaekspertide meeskond. Screeni arendajatele saadeti teave haavatavuste kohta 7. veebruaril, kuid 90 p\u00e4eva jooksul ei suutnud nad k\u00f5igi haavatavuste korral parandusi ette valmistada ja SUSE t\u00f6\u00f6tajatel tuli m\u00f5ningate pat\u0161ide ettevalmistamine ise teha. Auditi viinud teadlaste arvates ei tunne praegused GNU screeni hooldajad projekti koodibaasi piisavalt h\u00e4sti ja ei suuda t\u00e4ielikult lahendada tuvastatud turvaprobleeme.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63226\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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, [&hellip;]<\/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<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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