{"id":114795,"date":"2024-04-05T00:25:42","date_gmt":"2024-04-04T22:25:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-x-org-server-21-1-12-s-ustraneniem-4-uyazvimostej"},"modified":"2024-04-05T00:25:42","modified_gmt":"2024-04-04T22:25:42","slug":"obnovlenie-x-org-server-21-1-12-s-ustraneniem-4-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-x-org-server-21-1-12-s-ustraneniem-4-uyazvimostej","title":{"rendered":"Aktualizace X.Org Server 21.1.12 s opravou 4 zranitelnost\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byly vyd\u00e1ny opravn\u00e9 verze X.Org Server 21.1.12 a DDX komponenty (Device-Dependent X) xwayland 23.2.5, kter\u00e1 umo\u017e\u0148uje spu\u0161t\u011bn\u00ed X.Org Serveru pro provoz X11 aplikac\u00ed v prost\u0159ed\u00edch zalo\u017een\u00fdch na Waylandu. V nov\u00e9 verzi X.Org Serveru byly odstran\u011bny 4 zranitelnosti. Jedna zranitelnost m\u016f\u017ee b\u00fdt zneu\u017eita k z\u00edsk\u00e1n\u00ed pr\u00e1v na syst\u00e9mech, kde je X-server spu\u0161t\u011bn s pr\u00e1vami root, a tak\u00e9 pro vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du v konfigurac\u00edch, kde je p\u0159\u00edstup realizov\u00e1n prost\u0159ednictv\u00edm p\u0159esm\u011brov\u00e1n\u00ed relace X11 pomoc\u00ed SSH.       <\/p>\n<p>Dal\u0161\u00ed t\u0159i zranitelnosti mohou v\u00e9st k \u00faniku obsahu pam\u011bti <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-los-angeles\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3610\">serveru<\/a> nebo k neo\u010dek\u00e1van\u00e9mu ukon\u010den\u00ed \u010dinnosti. Tyto t\u0159i zranitelnosti byly zneu\u017eity prost\u0159ednictv\u00edm pou\u017eit\u00ed na stran\u011b klienta jin\u00e9ho po\u0159ad\u00ed bajt\u016f, ne\u017e jak\u00e9 je na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-dronten\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2580\">serveru<\/a>. V souvislosti s t\u00edmto byl v nov\u00e9m vyd\u00e1n\u00ed navr\u017een zp\u016fsob pro blokov\u00e1n\u00ed p\u0159ipojen\u00ed klient\u016f z syst\u00e9m\u016f, kter\u00e9 maj\u00ed jin\u00fd po\u0159\u00e1dek bajt\u016f. Pro deaktivaci lze pou\u017e\u00edt konfigura\u010dn\u00ed parametr &#171;AllowByteSwappedClients&#187; nebo volbu p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku &#171;+byteswappedclients&#187;.    <\/p>\n<p>Zm\u011bna v\u00fdchoz\u00ed hodnoty umo\u017e\u0148uje ochranu p\u0159ed mo\u017en\u00fdmi dosud neodhalen\u00fdmi zranitelnostmi, kter\u00e9 manipuluj\u00ed s po\u0159ad\u00edm bajt\u016f. Podstatou t\u011bchto zranitelnost\u00ed je, \u017ee zm\u011bna po\u0159ad\u00ed bajt\u016f pro hodnoty o velikosti vede k jejich nespr\u00e1vn\u00e9 interpretaci a \u010dten\u00ed nebo z\u00e1pisu do pam\u011bti jasn\u011b v\u011bt\u0161\u00edho objemu, ne\u017e pojme vyhrazen\u00fd buffer.    <\/p>\n<p>V sou\u010dasnosti je st\u00e1le zachov\u00e1na podpora klient\u016f s jin\u00fdm po\u0159ad\u00edm bajt\u016f, a\u010dkoli se v praxi v posledn\u00ed dob\u011b konverze po\u0159ad\u00ed bajt\u016f pou\u017e\u00edv\u00e1 velmi z\u0159\u00eddka, proto\u017ee pracovn\u00ed stanice, na kter\u00fdch b\u011b\u017e\u00ed X-server, jsou obvykle vybaveny procesory s po\u0159ad\u00edm bajt\u016f little-endian (od nejmen\u0161\u00edho k nejv\u011bt\u0161\u00edmu bajtu) a p\u0159ipojen\u00ed k nim X-klient\u016f s po\u0159ad\u00edm big-endian, jako je platforma s390x (IBM zSystems), je mimo\u0159\u00e1dn\u011b vz\u00e1cn\u00e9.       <\/p>\n<p>Identifikovan\u00e9 probl\u00e9my:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-31080, CVE-2024-31081, CVE-2024-31082 &#8212; \u010dten\u00ed dat z oblasti mimo buffer prost\u0159ednictv\u00edm manipulac\u00ed s funkcemi ProcXIGetSelectedEvents, ProcXIPassiveGrabDevice a ProcAppleDRICreatePixmap, kter\u00e9 vyu\u017e\u00edvaj\u00ed pole s velikost\u00ed, kter\u00e1 nezohled\u0148uje po\u0159\u00e1dek bajt\u016f ve hodnot\u011b p\u0159edan\u00e9 klientem. V souladu s t\u00edm, p\u0159i rozd\u00edlech v po\u0159ad\u00ed bajt\u016f mezi klientem a serverem, funkce vracej\u00ed klientovi v\u00edce dat. Prvn\u00ed dv\u011b probl\u00e9my se objevuj\u00ed od vyd\u00e1n\u00ed xorg-server-1.7.0 (2009), zat\u00edmco t\u0159et\u00ed se objevuje od xorg-server-1.15.0 (2012).\n<li class=\"l\"> CVE-2024-31083 &#8212; p\u0159\u00edstup k ji\u017e uvoln\u011bn\u00e9 pam\u011bti (User-after-free) ve funkci ProcRenderAddGlyphs, kter\u00e1 vol\u00e1 funkci AllocateGlyph() pro ulo\u017een\u00ed nov\u00fdch glif\u016f p\u0159edan\u00fdch klientem. Funkce AllocateGlyph() vrac\u00ed nov\u00fd glif s nulov\u00fdm po\u010dtem odkaz\u016f (refcount=0), a op\u011btovn\u00e9 odkazov\u00e1n\u00ed na glif nezp\u016fsobuje zv\u00fd\u0161en\u00ed po\u010dtu odkaz\u016f, co\u017e m\u016f\u017ee zp\u016fsobit, \u017ee pole glyph_new obsahuje v\u00edce z\u00e1znam\u016f odkazuj\u00edc\u00edch na jeden glif bez po\u010dtu odkaz\u016f. P\u0159i uvol\u0148ov\u00e1n\u00ed pam\u011bti pomoc\u00ed funkce ProcRenderAddGlyphs() pro glif z\u016fst\u00e1v\u00e1 v poli a m\u016f\u017ee b\u00fdt pou\u017eit nadbyte\u010dn\u00fd instanci ukazatele na glif, jeho\u017e pam\u011b\u0165 ji\u017e byla uvoln\u011bna. Probl\u00e9m se objevuje v X.Org Server a net\u00fdk\u00e1 se xwayland.        <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60927\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 X.Org Server 21.1.12 \u0438 DDX-\u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0430 (Device-Dependent X) xwayland 23.2.5, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0437\u0430\u043f\u0443\u0441\u043a X.Org Server \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f X11-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u0445 \u043d\u0430 \u0431\u0430\u0437\u0435 Wayland. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 X.Org Server \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b 4 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438. \u041e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 X-\u0441\u0435\u0440\u0432\u0435\u0440 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0441 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