{"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\/ro\/blog\/news\/uyazvimosti-v-dnsmasq-dopuskayushhie-otravlenie-dns-kesha-i-vypolnenie-koda-s-pravami-root","title":{"rendered":"Vulnerabilit\u0103\u021bi \u00een dnsmasq, care permit otr\u0103virea cache-ului DNS \u0219i executarea codului cu privilegiile de root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00cen pachetul Dnsmasq, care combin\u0103 un rezolvator DNS cache, un server DHCP, un serviciu pentru anun\u021buri de rute IPv6 \u0219i un sistem de bootare prin re\u021bea, au fost descoperite 6 vulnerabilit\u0103\u021bi care permit executarea de cod cu drepturi de root, redirec\u021bionarea unui domeniu c\u0103tre o alt\u0103 adres\u0103 IP, determinarea con\u021binutului memoriei procesului \u0219i provocarea unei opriri nea\u0219teptate a serviciului. Problema a fost corectat\u0103 \u00een versiunea dnsmasq 2.92rel2. Corec\u021biile sunt de asemenea disponibile sub form\u0103 de patch-uri.             <\/p>\n<p>Problemele identificate:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2026-4892 \u2014 overflow in the DHCPv6 implementation, allowing an attacker with local network access to execute code with root privileges by sending a specially crafted DHCPv6 packet. The overflow is caused by the fact that when writing the DHCPv6 CLID to the buffer, it did not take into account that the data in the packet is stored in hexadecimal representation, where three bytes are used for each actual byte of CLID (for example, saving a 1000-byte CLID will result in writing 3000 bytes).\n<li class=\"l\"> CVE-2026-2291 \u2014 buffer overflow in the extract_name() function, allowing an attacker to inject arbitrary records into the DNS cache and obtain redirection. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/domain\/\" title=\"domeniu\" data-wpil-keyword-link=\"linked\">domeniu<\/a> c\u0103tre o alt\u0103 adres\u0103 IP. Dep\u0103\u0219irea a survenit din cauza aloc\u0103rii buffer-ului f\u0103r\u0103 a lua \u00een considerare evadarea unor caractere \u00een reprezentarea intern\u0103 a numelui domeniului \u00een dnsmasq.\n<li class=\"l\"> CVE-2026-4893 \u2014 information leak allowing bypassing verification by sending a specially crafted DNS packet with client subnet information (RFC 7871). The vulnerability can be exploited to alter the DNS response routing and redirect users to the attacker's domain. This vulnerability is caused by passing the OPT record length to the check_source() function instead of the packet length, resulting in the function always returning a successful validation result.\n<li class=\"l\"> CVE-2026-4891 \u2014 reading from out-of-bounds memory during DNSSEC validation, leading to data leakage from the process memory in response to a specially crafted DNS request.\n<li class=\"l\"> CVE-2026-4890 \u2014 looping during DNSSEC validation, allowing denial of service through sending a specially crafted DNS packet.\n<li class=\"l\"> CVE-2026-5172 \u2014 reading from out-of-bounds memory in the extract_addresses() function, leading to a crash when processing specially crafted DNS responses.  <\/ul>\n<p>Starea remedierii vulnerabilit\u0103\u021bilor \u00een distribu\u021bii poate fi evaluat\u0103 pe aceste pagini (dac\u0103 pagina nu este disponibil\u0103, \u00eenseamn\u0103 c\u0103 dezvoltatorii distribu\u021biei nu au \u00eenceput \u00eenc\u0103 s\u0103 analizeze problema): Debian, Ubuntu, SUSE, RHEL, Gentoo, Arch, Fedora, OpenWRT, FreeBSD. Proiectul Dnsmasq este utilizat \u00een platforma Android \u0219i \u00een distribu\u021bii specializate, cum ar fi OpenWrt \u0219i DD-WRT, precum \u0219i \u00een firmware-urile routerelor wireless de la mul\u021bi produc\u0103tori. \u00cen distribu\u021biile obi\u0219nuite, Dnsmasq poate fi instalat utiliz\u00e2nd libvirt pentru a asigura func\u021bionarea serviciului DNS \u00een <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/vps\/abuzoustojchivye-vps\/\" title=\"virtu\u00e1lne ma\u0161ini\" data-wpil-keyword-link=\"linked\">virtu\u00e1lne ma\u0161ini<\/a> sau poate fi activat \u00een configuratorul NetworkManager.<br \/>\n<br \/>Sursa: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65431\">opennet.ro<\/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 5.0.2.1 - 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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care permit otr\u0103virea cache-ului DNS \u0219i execu\u021bia de cod cu privilegii de root | ProHoster","description":"Pachetul Dnsmasq, care combin\u0103 un rezolvator DNS cache, server DHCP, serviciu pentru anun\u021buri de rute IPv6 \u0219i sistem de bootare prin re\u021bea, con\u021bine 6 vulnerabilit\u0103\u021bi care permit executarea codului cu privilegii de root \u0219i redirec\u021bionarea domenelor.","canonical_url":"https:\/\/prohoster.info\/ro\/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":"ro_RO","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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