{"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\/ro\/blog\/news\/obnovlenie-x-org-server-21-1-12-s-ustraneniem-4-uyazvimostej","title":{"rendered":"Actualizarea X.Org Server 21.1.12 remediaz\u0103 4 vulnerabilit\u0103\u021bi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Au fost publicate versiunile corective X.Org Server 21.1.12 \u0219i DDX (Device-Dependent X) xwayland 23.2.5, care permit rularea X.Org Server pentru a organiza executarea aplica\u021biilor X11 \u00een medii bazate pe Wayland. \u00cen noua versiune a X.Org Server au fost remediate 4 vulnerabilit\u0103\u021bi. O vulnerabilitate poate fi exploatat\u0103 pentru a ob\u021bine privilegii \u00een sistemele \u00een care serverul X ruleaz\u0103 cu drepturi de root, precum \u0219i pentru executarea de cod de la distan\u021b\u0103 \u00een configura\u021biile \u00een care accesul este realizat prin redirec\u021bionarea sesiunii X11 folosind SSH.       <\/p>\n<p>Celelalte trei vulnerabilit\u0103\u021bi pot duce la scurgerea con\u021binutului memoriei <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3610\">server<\/a> sau la \u00eenchiderea brusc\u0103 a aplica\u021biei. Aceste trei vulnerabilit\u0103\u021bi sunt exploatate prin utilizarea unei ordini de bytes diferite de cea a <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/server\/dts-dronten\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2580\">server<\/a>. \u00cen acest sens, noua versiune propune posibilitatea de a bloca conexiuni ale clien\u021bilor din sisteme care au un alt ordonare a octe\u021bilor. Pentru dezactivare, se poate utiliza parametrul de configurare &#171;AllowByteSwappedClients&#187; sau op\u021biunea din linia de comand\u0103 &#171;+byteswappedclients&#187;.    <\/p>\n<p>Modificarea valorii implicite protejeaz\u0103 \u00eempotriva posibilelor vulnerabilit\u0103\u021bi neidentificate care manipuleaz\u0103 ordinea de bytes. Esen\u021ba acestor vulnerabilit\u0103\u021bi este c\u0103 modificarea ordinii de bytes pentru valori de dimensiune duce la interpretarea \u0219i citirea gre\u0219it\u0103 sau la scrierea \u00een memorie a unor dimensiuni mai mari dec\u00e2t bufferul alocat.    <\/p>\n<p>\u00cen prezent, se men\u021bine suportul pentru clien\u021bi cu o alt\u0103 ordine de bytes, de\u0219i, \u00een practic\u0103, conversia ordinii de bytes a fost utilizat\u0103 extrem de rar \u00een ultima vreme, deoarece sta\u021biile de lucru pe care ruleaz\u0103 serverul X sunt, de obicei, echipate cu procesoare cu ordine de bytes little-endian (de la byte-ul cel mai mic la cel mai mare) \u0219i conectarea la acestea a clien\u021bilor X cu ordine big-endian, cum ar fi platforma s390x (IBM zSystems), este o raritate.       <\/p>\n<p>Problemele identificate:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-31080, CVE-2024-31081, CVE-2024-31082 \u2014 citirea datelor dintr-o zon\u0103 dincolo de buffer prin manipularea func\u021biilor ProcXIGetSelectedEvents, ProcXIPassiveGrabDevice \u0219i ProcAppleDRICreatePixmap, care utilizeaz\u0103 un c\u00e2mp cu dimensiunea f\u0103r\u0103 a \u021bine cont de ordonarea octe\u021bilor \u00een valoarea transmis\u0103 de client. Prin urmare, \u00een cazul diferen\u021belor \u00een ordonarea octe\u021bilor \u00eentre client \u0219i server, func\u021biile returneaz\u0103 clientului mai multe date. Primele dou\u0103 probleme se manifest\u0103 \u00eencep\u00e2nd cu versiunea xorg-server-1.7.0 (anul 2009), iar a treia \u2014 cu xorg-server-1.15.0 (anul 2012).\n<li class=\"l\"> CVE-2024-31083 \u2014 accesarea memoriei deja eliberate (User-after-free) \u00een func\u021bia ProcRenderAddGlyphs, care apeleaz\u0103 func\u021bia AllocateGlyph() pentru a salva noi glife transmise de client. Func\u021bia AllocateGlyph() returneaz\u0103 un nou glyph cu un contor de referin\u021be zero (refcount=0), iar re-atribuitul glyph-ului nu conduce la cre\u0219terea contorului de referin\u021be, din cauza c\u0103reia matricea glyph_new poate include mai multe intr\u0103ri care indic\u0103 spre un glyph f\u0103r\u0103 contor de referin\u021be. La eliberarea de c\u0103tre func\u021bia ProcRenderAddGlyphs() a memoriei alocate pentru glyph, \u00een matrice r\u0103m\u00e2ne \u0219i poate fi utilizat un exemplu de pointer \u00een plus spre glyph, memoria pentru care a fost deja eliberat\u0103. Problema se manifest\u0103 \u00een X.Org Server \u0219i nu afecteaz\u0103 xwayland.        <\/ul>\n<p>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60927\">opennet.ro<\/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 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f [&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-114795","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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