{"id":106239,"date":"2022-12-22T15:36:49","date_gmt":"2022-12-22T13:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-systemd-coredump-pozvolyayushhaya-opredelit-soderzhimoe-pamyati-suid-programm"},"modified":"2022-12-22T15:36:49","modified_gmt":"2022-12-22T13:36:49","slug":"uyazvimost-v-systemd-coredump-pozvolyayushhaya-opredelit-soderzhimoe-pamyati-suid-programm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-systemd-coredump-pozvolyayushhaya-opredelit-soderzhimoe-pamyati-suid-programm","title":{"rendered":"Vulnerabilit\u00e1s a systemd-coredumpban, amely lehet\u0151v\u00e9 teszi a suid-programok mem\u00f3riatartalm\u00e1nak meg\u00e1llap\u00edt\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A systemd-coredump komponensben, amely a folyamatok \u00f6sszeoml\u00e1sa ut\u00e1n gener\u00e1lt core f\u00e1jlok kezel\u00e9s\u00e9t biztos\u00edtja, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2022-4415) t\u00e1rtak fel, amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt helyi felhaszn\u00e1l\u00f3 meghat\u00e1rozza a root jogosults\u00e1ggal fut\u00f3 privilegiz\u00e1lt folyamatok mem\u00f3ria tartalm\u00e1t. A probl\u00e9ma jelenl\u00e9te az alap\u00e9rtelmezett konfigur\u00e1ci\u00f3ban meger\u0151s\u00edt\u00e9st nyert az openSUSE, Arch, Debian, Fedora \u00e9s SLES disztrib\u00faci\u00f3kban. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9get az fs.suid_dumpable sysctl param\u00e9ter helytelen kezel\u00e9se okozza a systemd-coredumpban, amelynek alap\u00e9rtelmezett \u00e9rt\u00e9ke 2, \u00e9s lehet\u0151v\u00e9 teszi core-dumpok gener\u00e1l\u00e1s\u00e1t suid flag-gel rendelkez\u0151 folyamatok sz\u00e1m\u00e1ra. Azt felt\u00e9telezik, hogy a kernel \u00e1ltal \u00edrt core f\u00e1jlok suid folyamatokhoz csak a root felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra olvashat\u00f3 jogosults\u00e1gokat kapnak. A systemd-coredump eszk\u00f6z, amelyet a kernel h\u00edv meg core f\u00e1jlok ment\u00e9s\u00e9re, a core f\u00e1jlt root azonos\u00edt\u00f3val menti, de tov\u00e1bbi hozz\u00e1f\u00e9r\u00e9st biztos\u00edt a core f\u00e1jlokhoz ACL alapj\u00e1n, amely lehet\u0151v\u00e9 teszi az olvas\u00e1st a folyamatot eredetileg elind\u00edt\u00f3 tulajdonos azonos\u00edt\u00f3ja alapj\u00e1n. <\/p>\n

Ez a jellemz\u0151 lehet\u0151v\u00e9 teszi a core f\u00e1jlok bet\u00f6lt\u00e9s\u00e9t f\u00fcggetlen\u00fcl att\u00f3l, hogy a program v\u00e1ltoztathatja a felhaszn\u00e1l\u00f3i azonos\u00edt\u00f3j\u00e1t \u00e9s emelt jogokkal fut. A t\u00e1mad\u00e1s l\u00e9nyege, hogy a felhaszn\u00e1l\u00f3 elind\u00edthat egy suid alkalmaz\u00e1st, \u00e9s SIGSEGV jelet k\u00fcldhet neki, majd let\u00f6ltheti a core f\u00e1jl tartalm\u00e1t, amely a folyamat mem\u00f3ria \u00e1llom\u00e1ny\u00e1nak mint\u00e1zat\u00e1t tartalmazza az \u00f6sszeoml\u00e1s id\u0151pontj\u00e1ban. <\/p>\n

P\u00e9ld\u00e1ul a felhaszn\u00e1l\u00f3 elind\u00edthatja a « \/usr\/bin\/su » parancsot, \u00e9s egy m\u00e1sik termin\u00e1lban le\u00e1ll\u00edthatja azt a « kill -s SIGSEGV `pidof su` » paranccsal, ezt k\u00f6vet\u0151en a systemd-coredump menteni fogja a core f\u00e1jlt a \/var\/lib\/systemd\/coredump mapp\u00e1ba, \u00e1ll\u00edtva annak ACL-j\u00e9t, amely lehet\u0151v\u00e9 teszi az aktu\u00e1lis felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra a f\u00e1jl olvas\u00e1s\u00e1t. Mivel a suid-utility ‘su’ olvassa a mem\u00f3ria tartalm\u00e1t az \/etc\/shadow el\u00e9r\u00e9si \u00faton, a t\u00e1mad\u00f3 hozz\u00e1f\u00e9r\u00e9st nyerhet a jelsz\u00f3hashekhez az \u00f6sszes felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra a rendszerben. A sudo utility nem \u00e9rz\u00e9keny a t\u00e1mad\u00e1sra, mert megtiltja a core-f\u00e1jlok gener\u00e1l\u00e1s\u00e1t az ulimit seg\u00edts\u00e9g\u00e9vel. <\/p>\n

A fejleszt\u0151k nyilatkozata szerint a systemd sebezhet\u0151s\u00e9ge a 247-es verzi\u00f3 megjelen\u00e9s\u00e9vel kezd\u0151d\u00f6tt el (2020 november), de a probl\u00e9ma felfedez\u0151je szerint a 246-os verzi\u00f3 is \u00e9rintett. A sebezhet\u0151s\u00e9g akkor l\u00e9p fel, ha a systemd a libacl k\u00f6nyvt\u00e1rral van \u00f6ssze\u00e1ll\u00edtva (alap\u00e9rtelmezetten az \u00f6sszes n\u00e9pszer\u0171 disztrib\u00faci\u00f3ban). A jav\u00edt\u00e1s egyel\u0151re patch form\u00e1j\u00e1ban \u00e9rhet\u0151 el. A disztrib\u00faci\u00f3kban el\u00e9rhet\u0151 jav\u00edt\u00e1s nyomon k\u00f6vethet\u0151 az al\u00e1bbi oldalakon: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Gentoo, Arch. Mint ideiglenes v\u00e9delmi megold\u00e1s a sysctl fs.suid_dumpable \u00e9rt\u00e9k\u00e9t 0-ra \u00e1ll\u00edthatjuk, amely letiltja a systemd-coredump kezel\u0151nek t\u00f6rt\u00e9n\u0151 mem\u00f3ria dumpok tov\u00e1bb\u00edt\u00e1s\u00e1t.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0435 systemd-coredump, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u043c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 core-\u0444\u0430\u0439\u043b\u043e\u0432, \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0445 \u043f\u043e\u0441\u043b\u0435 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-4415), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0437\u0430\u043f\u0443\u0449\u0435\u043d\u043d\u044b\u0445 \u0441 \u0444\u043b\u0430\u0433\u043e\u043c suid root. \u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u043e \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 openSUSE, Arch, Debian, Fedora \u0438 SLES. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 sysctl-\u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430 fs.suid_dumpable \u0432 systemd-coredump, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u0438 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u043c […]<\/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-106239","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 systemd-coredump-ban, amely lehet\u0151v\u00e9 teszi a suid programok mem\u00f3ria tartalm\u00e1nak meghat\u00e1roz\u00e1s\u00e1t | ProHoster","description":"A systemd-coredump komponensben, amely a folyamatok \u00f6sszeoml\u00e1sa ut\u00e1n gener\u00e1lt core f\u00e1jlok kezel\u00e9s\u00e9t biztos\u00edtja, egy sebezhet\u0151s\u00e9get (CVE-2022-4415) fedeztek fel, amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt helyi felhaszn\u00e1l\u00f3 jogosulatlan hozz\u00e1f\u00e9r\u00e9st szerezzen.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-systemd-coredump-pozvolyayushhaya-opredelit-soderzhimoe-pamyati-suid-programm","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 systemd-coredump, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 suid-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c | ProHoster","og:description":"\u0412 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0435 systemd-coredump, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u043c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 core-\u0444\u0430\u0439\u043b\u043e\u0432, \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0445 \u043f\u043e\u0441\u043b\u0435 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-4415), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-systemd-coredump-pozvolyayushhaya-opredelit-soderzhimoe-pamyati-suid-programm","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-12-22T13:36:49+00:00","article:modified_time":"2022-12-22T13:36:49+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=106239"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106239\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=106239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=106239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=106239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}