{"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\/hr\/blog\/news\/obnovlenie-x-org-server-21-1-12-s-ustraneniem-4-uyazvimostej","title":{"rendered":"A\u017euriranje X.Org Server 21.1.12 s ispravkom 4 ranjivosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Objavljeni su ispravci za X.Org Server 21.1.12 i DDX komponentu (Device-Dependent X) xwayland 23.2.5, koja omogu\u0107ava pokretanje X.Org Servera za izvr\u0161avanje X11 aplikacija u okru\u017eenjima temeljenim na Waylandu. U novoj verziji X.Org Server ispravljeno je 4 ranjivosti. Jedna ranjivost mo\u017ee se iskoristiti za pove\u0107anje privilegija u sustavima u kojima X server radi s root pravima, kao i za daljinsko izvr\u0161avanje koda u konfiguracijama u kojima se pristup vr\u0161i preusmjeravanjem X11 sesija putem SSH.       <\/p>\n<p>Preostale tri ranjivosti mogu dovesti do curenja sadr\u017eaja memorije <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-los-angeles\/\"   title=\"poslu\u017eitelja\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3610\">poslu\u017eitelja<\/a> ili do iznenadnog prekida rada. Ove tri ranjivosti iskori\u0161tavaju se kori\u0161tenjem klijentske strane s druga\u010dijim redoslijedom bajtova nego na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-dronten\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2580\">serveru<\/a>. U tom pogledu, u novom izdanju predlo\u017eena je mogu\u0107nost blokiranja povezivanja klijenata s sustava koji imaju drugi redoslijed bajtova. Za isklju\u010divanje mo\u017eete koristiti konfiguracijski parametar &#171;AllowByteSwappedClients&#187; ili opciju naredbenog retka &#171;+byteswappedclients&#187;.    <\/p>\n<p>Mijenjanje zadane vrijednosti omogu\u0107uje za\u0161titu od mogu\u0107ih jo\u0161 neotkrivenih ranjivosti koje manipuliraju redoslijedom bajtova. Su\u0161tina takvih ranjivosti je da promjena redoslijeda bajtova za vrijednosti odre\u0111ene veli\u010dine dovodi do njihove neto\u010dne interpretacije i \u010ditanja ili pisanja u memoriju iznad veli\u010dine koju ima dodijeljeni spremnik.    <\/p>\n<p>Za sada se zadr\u017eava podr\u0161ka za klijente s drugim redoslijedom bajtova, iako se u praksi prebacivanje redoslijeda bajtova posljednjih godina izuzetno rijetko koristi, jer radne stanice na kojima se pokre\u0107e X server obi\u010dno imaju procesore s redoslijedom bajtova little-endian (od mla\u0111eg ka starijem bajtu) i povezivanje s njima X klijenata s redoslijedom big-endian, kao \u0161to je platforma s390x (IBM zSystems), izuzetno je rijetko.       <\/p>\n<p>Otkrivene pote\u0161ko\u0107e:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-31080, CVE-2024-31081, CVE-2024-31082 &#8212; \u010ditanje podataka iz podru\u010dja izvan bafera putem manipulacije funkcijama ProcXIGetSelectedEvents, ProcXIPassiveGrabDevice i ProcAppleDRICreatePixmap, koje koriste polje s veli\u010dinom bez obzira na redoslijed bajtova u vrijednosti koju \u0161alje klijent. Stoga, pri razlikama u redoslijedu bajtova izme\u0111u klijenta i poslu\u017eitelja, funkcije vra\u0107aju klijentu vi\u0161e podataka. Prve dvije probleme se manifestiraju od izdanja xorg-server-1.7.0 (2009. godina), dok se tre\u0107a javlja s xorg-server-1.15.0 (2012. godina).\n<li class=\"l\"> CVE-2024-31083 &#8212; pristup ve\u0107 oslobo\u0111enoj memoriji (User-after-free) u funkciji ProcRenderAddGlyphs, koja poziva funkciju AllocateGlyph() za pohranu novih glifova, koji su poslani od strane klijenta. Funkcija AllocateGlyph() vra\u0107a novi glif s nultim brojem referenci (refcount=0), a ponovna oznaka glifa ne dovodi do pove\u0107anja broja referenci, zbog \u010dega niz glyph_new mo\u017ee uklju\u010divati vi\u0161e unosa koji upu\u0107uju na jedan glif bez broja referenci. Kada funkcija ProcRenderAddGlyphs() oslobodi memoriju dodijeljenu za glif, u nizu ostaje i mo\u017ee se koristiti suvi\u0161ni primjerak pokaziva\u010da na glif, \u010dija je memorija ve\u0107 oslobo\u0111ena. Problem se manifestira u X.Org Server-u i ne zahva\u0107a xwayland.        <\/ul>\n<p>Izvor: <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 \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 5.0.4 - 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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