{"id":170683,"date":"2026-05-15T00:24:28","date_gmt":"2026-05-14T22:24:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-dnsmasq-dopuskayushhie-otravlenie-dns-kesha-i-vypolnenie-koda-s-pravami-root"},"modified":"2026-05-15T00:24:28","modified_gmt":"2026-05-14T22:24:28","slug":"uyazvimosti-v-dnsmasq-dopuskayushhie-otravlenie-dns-kesha-i-vypolnenie-koda-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimosti-v-dnsmasq-dopuskayushhie-otravlenie-dns-kesha-i-vypolnenie-koda-s-pravami-root","title":{"rendered":"S\u00e5rbarheter i dnsmasq som m\u00f6jligg\u00f6r DNS-cachef\u00f6rgiftning och k\u00f6rning av kod med root-beh\u00f6righet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I paketet Dnsmasq, som kombinerar en cache DNS-resolver, DHCP-server, en tj\u00e4nst f\u00f6r IPv6-rutningsannonser och ett n\u00e4tverksstartsystem, har 6 s\u00e5rbarheter uppt\u00e4ckts som g\u00f6r det m\u00f6jligt att k\u00f6ra kod med root-r\u00e4ttigheter, omdirigera en dom\u00e4n till en annan IP, fastst\u00e4lla inneh\u00e5llet i processen minne och orsaka ett kraschar service. Problemet har \u00e5tg\u00e4rdats i versionen dnsmasq 2.92rel2. Patchar finns ocks\u00e5 tillg\u00e4ngliga.             <\/p>\n<p>Identifierade problem:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2026-4892 \u2014 buffert\u00f6jning i implementeringen av DHCPv6, som g\u00f6r det m\u00f6jligt f\u00f6r en angripare med lokal n\u00e4tverks\u00e5tkomst att k\u00f6ra kod med root-r\u00e4ttigheter genom att skicka ett s\u00e4rskilt utformat DHCPv6-paket. Buffert\u00f6jningen orsakas av att n\u00e4r DHCPv6 CLID skrivs till bufferten, beaktades inte att data i paketet lagras i hexadecimalt format, d\u00e4r tre byte anv\u00e4nds f\u00f6r varje faktisk byte av CLID (till exempel, lagring av en 1000-byte CLID kommer att resultera i att 3000 byte skrivs).\n<li class=\"l\"> CVE-2026-2291 \u2014 buffert\u00f6jning i funktionen extract_name(), vilket g\u00f6r det m\u00f6jligt f\u00f6r en angripare att injicera falska poster i DNS-cachen och uppn\u00e5 omdirigering. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/domain\/\" title=\"dom\u00e4n\" data-wpil-keyword-link=\"linked\">dom\u00e4n<\/a> till en annan IP-adress. \u00d6verskridningen uppstod p\u00e5 grund av att bufferten allokerades utan att ta h\u00e4nsyn till att vissa tecken i den interna representationen av dom\u00e4nnamn i dnsmasq beh\u00f6vde rymmas.\n<li class=\"l\"> CVE-2026-4893 \u2014 informationsl\u00e4ckage som m\u00f6jligg\u00f6r omv\u00e4gning via ett s\u00e4rskilt utformat DNS-paket med klientens subnetinformation (RFC 7871). S\u00e5rbarheten kan anv\u00e4ndas f\u00f6r att \u00e4ndra DNS-svaret och omdirigera anv\u00e4ndare till angriparens dom\u00e4n. S\u00e5rbarheten orsakas av att l\u00e4ngden p\u00e5 OPT-posten skickades till funktionen check_source() ist\u00e4llet f\u00f6r l\u00e4ngden p\u00e5 paketet, vilket gjorde att funktionen alltid returnerade ett lyckat kontrollresultat.\n<li class=\"l\"> CVE-2026-4891 \u2014 l\u00e4sning utanf\u00f6r buffertens gr\u00e4nser vid validering av DNSSEC, vilket leder till att data fr\u00e5n processens minne l\u00e4cks i svaret vid bearbetning av en s\u00e4rskilt utformad DNS-f\u00f6rfr\u00e5gan.\n<li class=\"l\"> CVE-2026-4890 \u2014 o\u00e4ndlig loop vid validering av DNSSEC, vilket m\u00f6jligg\u00f6r en DoS-attack genom att skicka ett s\u00e4rskilt utformat DNS-paket.\n<li class=\"l\"> CVE-2026-5172 \u2014 l\u00e4sning utanf\u00f6r bufferten i funktionen extract_addresses(), vilket leder till krasch vid bearbetning av s\u00e4rskilt utformade DNS-svar.  <\/ul>\n<p>Statusen f\u00f6r \u00e5tg\u00e4rdandet av s\u00e5rbarheter i distributionerna kan bed\u00f6mas p\u00e5 dessa sidor (om sidan \u00e4r otillg\u00e4nglig, betyder det att utvecklarna av distributionen \u00e4nnu inte har p\u00e5b\u00f6rjat granskningen av problemet): Debian, Ubuntu, SUSE, RHEL, Gentoo, Arch, Fedora, OpenWRT, FreeBSD. Projektet Dnsmasq anv\u00e4nds i Android-plattformen och specialiserade distributioner som OpenWrt och DD-WRT, samt i firmware f\u00f6r tr\u00e5dl\u00f6sa routrar fr\u00e5n m\u00e5nga tillverkare. I vanliga distributioner kan Dnsmasq installeras n\u00e4r libvirt anv\u00e4nds f\u00f6r att tillhandah\u00e5lla DNS-tj\u00e4nst i <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/vps\/abuzoustojchivye-vps\/\" title=\"virtuella maskiner\" data-wpil-keyword-link=\"linked\">virtuella maskiner<\/a> eller aktiveras i NetworkManager-konfigureraren.<br \/>\n<br \/>K\u00e4lla: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65431\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 Dnsmasq, \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u044e\u0449\u0435\u043c \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0449\u0438\u0439 DNS-\u0440\u0435\u0437\u043e\u043b\u0432\u0435\u0440, \u0441\u0435\u0440\u0432\u0435\u0440 DHCP, \u0441\u0435\u0440\u0432\u0438\u0441 \u0434\u043b\u044f \u0430\u043d\u043e\u043d\u0441\u043e\u0432 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u043e\u0432 IPv6 \u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0443 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u043f\u043e \u0441\u0435\u0442\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e 6 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root, \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0434\u043e\u043c\u0435\u043d \u043d\u0430 \u0434\u0440\u0443\u0433\u043e\u0439 IP, \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\u043e\u0446\u0435\u0441\u0441\u0430 \u0438 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0435 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0435 \u0441\u0435\u0440\u0432\u0438\u0441\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 dnsmasq 2.92rel2. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0442\u0430\u043a\u0436\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u0432 \u0444\u043e\u0440\u043c\u0435 \u043f\u0430\u0442\u0447\u0435\u0439. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b: [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-170683","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=\"\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 Dnsmasq, \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u044e\u0449\u0435\u043c \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0449\u0438\u0439 DNS-\u0440\u0435\u0437\u043e\u043b\u0432\u0435\u0440, \u0441\u0435\u0440\u0432\u0435\u0440 DHCP, \u0441\u0435\u0440\u0432\u0438\u0441 \u0434\u043b\u044f \u0430\u043d\u043e\u043d\u0441\u043e\u0432 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u043e\u0432 IPv6 \u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0443 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m\u00f6jligg\u00f6r DNS-cachef\u00f6rgiftning och kodk\u00f6rning med root-r\u00e4ttigheter | ProHoster","description":"I Dnsmasq-paketet, som kombinerar en cache DNS-uppl\u00f6sare, DHCP-server, tj\u00e4nst f\u00f6r att annonsera IPv6-rutter och n\u00e4tverksstart, har 6 s\u00e5rbarheter uppt\u00e4ckts som kan till\u00e5ta kodk\u00f6rning med root-r\u00e4ttigheter och omdirigering av dom\u00e4ner.","canonical_url":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimosti-v-dnsmasq-dopuskayushhie-otravlenie-dns-kesha-i-vypolnenie-koda-s-pravami-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sv_SE","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 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