{"id":105601,"date":"2022-11-16T21:37:02","date_gmt":"2022-11-16T19:37:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dve-uyazvimosti-v-grub2-pozvolyayushhie-obojti-zashhitu-uefi-secure-boot"},"modified":"2022-11-16T21:37:02","modified_gmt":"2022-11-16T19:37:02","slug":"dve-uyazvimosti-v-grub2-pozvolyayushhie-obojti-zashhitu-uefi-secure-boot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/dve-uyazvimosti-v-grub2-pozvolyayushhie-obojti-zashhitu-uefi-secure-boot","title":{"rendered":"K\u00e9t s\u00e9r\u00fcl\u00e9kenys\u00e9g a GRUB2-ben, amelyek lehet\u0151v\u00e9 teszik az UEFI Secure Boot v\u00e9delem megker\u00fcl\u00e9s\u00e9t.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>K\u00e9t s\u00e9r\u00fcl\u00e9kenys\u00e9g ker\u00fclt napvil\u00e1gra a GRUB2 ind\u00edt\u00f3szoftverben, amelyek lehet\u0151v\u00e9 tehetik a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t speci\u00e1lisan form\u00e1zott bet\u0171t\u00edpusok haszn\u00e1lata \u00e9s bizonyos Unicode-sorozatok feldolgoz\u00e1sa sor\u00e1n. A s\u00e9r\u00fcl\u00e9kenys\u00e9gek kihaszn\u00e1lhat\u00f3k az UEFI Secure Boot hiteles\u00edtett ind\u00edt\u00e1si mechanizmus\u00e1nak megker\u00fcl\u00e9s\u00e9re.        <\/p>\n<p>Felt\u00e1rt sebezhet\u0151s\u00e9gek:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2022-2601 \u2014 puffer overflow a grub_font_construct_glyph() f\u00fcggv\u00e9nyben, amikor pf2 form\u00e1tum\u00fa, gondosan k\u00e9sz\u00edtett bet\u0171t\u00edpusokat dolgoz fel. Ez a max_glyph_size param\u00e9ter helytelen kisz\u00e1m\u00edt\u00e1s\u00e1nak \u00e9s a mem\u00f3ria olyan ter\u00fclet\u00e9nek hozz\u00e1rendel\u00e9s\u00e9nek k\u00f6vetkezm\u00e9nye, amely nyilv\u00e1nval\u00f3an kisebb, mint ami sz\u00fcks\u00e9ges a glifek elhelyez\u00e9s\u00e9hez.\n<li class=\"l\"> CVE-2022-3775 \u2014 a mem\u00f3ria lefoglal\u00e1s\u00e1nak hat\u00e1rain k\u00edv\u00fcli \u00edr\u00e1s bizonyos Unicode szekvenci\u00e1k megjelen\u00edt\u00e9sekor, gondosan k\u00e9sz\u00edtett bet\u0171t\u00edpussal. A probl\u00e9ma a bet\u0171t\u00edpusok feldolgoz\u00e1s\u00e1nak k\u00f3dj\u00e1ban van, \u00e9s a glif sz\u00e9less\u00e9g\u00e9nek \u00e9s magass\u00e1g\u00e1nak a rendelkez\u00e9sre \u00e1ll\u00f3 bitk\u00e9p m\u00e9ret\u00e9hez val\u00f3 \u00f6sszehasonl\u00edt\u00e1sa nem megfelel\u0151 ellen\u0151rz\u00e9se okozza. A t\u00e1mad\u00f3 olyan bemenetet tud v\u00e1lasztani, amely lehet\u0151v\u00e9 teszi az adatok farok \u00edr\u00e1s\u00e1t a lefoglalt puffer hat\u00e1rain t\u00fal. Megjegyzend\u0151, hogy b\u00e1r a sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1nak neh\u00e9zs\u00e9gei jellemz\u0151ek, a probl\u00e9m\u00e1t k\u00f3d v\u00e9grehajt\u00e1s\u00e1hoz eljuttatni nem z\u00e1rhat\u00f3 ki.                <\/ul>\n<p> A hiba jav\u00edt\u00e1s\u00e1t patch form\u00e1j\u00e1ban tett\u00e9k k\u00f6zz\u00e9. A s\u00e9r\u00fcl\u00e9kenys\u00e9gek elh\u00e1r\u00edt\u00e1s\u00e1nak \u00e1llapota a disztrib\u00faci\u00f3k eset\u00e9ben ezen az oldalakon \u00e9rt\u00e9kelhet\u0151: Ubuntu, SUSE, RHEL, Fedora, Debian. A GRUB2 probl\u00e9m\u00e1inak megold\u00e1s\u00e1hoz nem el\u00e9g a csomag friss\u00edt\u00e9se, \u00faj bels\u0151 digit\u00e1lis al\u00e1\u00edr\u00e1sok gener\u00e1l\u00e1sa \u00e9s az install\u00e1l\u00f3 programok, ind\u00edt\u00f3szoftverek, kernel csomagok, fwupd-\u00fajra\u00edr\u00e1sok, \u00e9s a shim r\u00e9teg friss\u00edt\u00e9se is sz\u00fcks\u00e9ges.       <\/p>\n<p>In most Linux distributions, a small shim layer, signed by Microsoft's digital signature, is used for verified boot in UEFI Secure Boot mode. This shim verifies GRUB2 with its own certificate, allowing distribution developers not to sign every kernel and GRUB update with Microsoft. Vulnerabilities in GRUB2 enable the execution of one's code at the stage after successful shim verification but before the operating system loads, intercepting the trust chain while Secure Boot is active and gaining full control over the subsequent boot process, including booting another OS, modifying operating system components, and bypassing Lockdown protection.     <\/p>\n<p>A sebezhet\u0151s\u00e9g visszavon\u00e1sa n\u00e9lk\u00fcli blokkol\u00e1s\u00e1hoz a disztrib\u00faci\u00f3k haszn\u00e1lhatj\u00e1k az SBAT mechanizmust (UEFI Secure Boot Advanced Targeting), amelynek t\u00e1mogat\u00e1sa a GRUB2-re, shim-re \u00e9s fwupd-re a legt\u00f6bb n\u00e9pszer\u0171 Linux disztrib\u00faci\u00f3ban megval\u00f3sult. Az SBAT-ot a Microsoft egy\u00fcttm\u0171k\u00f6d\u00e9s\u00e9vel fejlesztett\u00e9k ki, \u00e9s plusz metaadat\u00e1k hozz\u00e1ad\u00e1s\u00e1t jelenti az UEFI komponensek v\u00e9grehajthat\u00f3 f\u00e1jljaihoz, amelyek tartalmazz\u00e1k a gy\u00e1rt\u00f3r\u00f3l, term\u00e9kr\u0151l, komponensr\u0151l \u00e9s verzi\u00f3r\u00f3l sz\u00f3l\u00f3 inform\u00e1ci\u00f3kat. Ezek a metaadatok digit\u00e1lis al\u00e1\u00edr\u00e1ssal hiteles\u00edtettek, \u00e9s k\u00fcl\u00f6n-k\u00fcl\u00f6n is szerepelhetnek az UEFI Secure Boot enged\u00e9lyezett vagy tilthat\u00f3 komponenseinek list\u00e1j\u00e1n.      <\/p>\n<p>Az SBAT lehet\u0151v\u00e9 teszi a digit\u00e1lis al\u00e1\u00edr\u00e1s blokkol\u00e1s\u00e1t a komponensek egyes verzi\u00f3sz\u00e1maihoz an\u00e9lk\u00fcl, hogy sz\u00fcks\u00e9g lenne a Secure Boot kulcsok visszavon\u00e1s\u00e1ra. A sebezhet\u0151s\u00e9gek SBAT \u00fatj\u00e1n t\u00f6rt\u00e9n\u0151 blokkol\u00e1sa nem ig\u00e9nyli az UEFI visszavont tan\u00fas\u00edtv\u00e1nyainak list\u00e1j\u00e1nak (dbx) haszn\u00e1lat\u00e1t, hanem a bels\u0151 kulcs cser\u00e9j\u00e9nek szintj\u00e9n t\u00f6rt\u00e9nik a GRUB2, shim \u00e9s m\u00e1s, disztrib\u00faci\u00f3k \u00e1ltal sz\u00e1ll\u00edtott bet\u00f6lt\u0151 artefaktumok al\u00e1\u00edr\u00e1s\u00e1hoz \u00e9s friss\u00edt\u00e9s\u00e9hez. Az SBAT bevezet\u00e9se el\u0151tt a visszavont tan\u00fas\u00edtv\u00e1nyok list\u00e1j\u00e1nak (dbx, UEFI Revocation List) friss\u00edt\u00e9se k\u00f6telez\u0151 felt\u00e9tele volt a sebezhet\u0151s\u00e9g teljes blokkol\u00e1s\u00e1nak, mivel a t\u00e1mad\u00f3, f\u00fcggetlen\u00fcl a haszn\u00e1lt oper\u00e1ci\u00f3s rendszert\u0151l, egy r\u00e9gi sebezhet\u0151 GRUB2 verzi\u00f3val rendelkez\u0151 boot k\u00f6zeg haszn\u00e1lat\u00e1val tudta kompromitt\u00e1lni az UEFI Secure Boot-ot, amelyet digit\u00e1lis al\u00e1\u00edr\u00e1s hiteles\u00edtett.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58130\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0434\u0432\u0443\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0435 GRUB2, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0448\u0440\u0438\u0444\u0442\u043e\u0432 \u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 Unicode-\u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0435\u0439. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0432\u0435\u0440\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 UEFI Secure Boot. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438: CVE-2022-2601 &#8212; \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0431\u0443\u0444\u0435\u0440\u0430 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 grub_font_construct_glyph() \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0448\u0440\u0438\u0444\u0442\u043e\u0432 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 pf2, \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0449\u0435\u0435 \u0438\u0437-\u0437\u0430 \u043d\u0435\u0432\u0435\u0440\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u0447\u0451\u0442\u0430 [&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-105601","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0434\u0432\u0443\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0435 GRUB2, 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