{"id":152349,"date":"2025-12-22T17:12:34","date_gmt":"2025-12-22T15:12:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd"},"modified":"2025-12-22T17:12:34","modified_gmt":"2025-12-22T15:12:34","slug":"udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","title":{"rendered":"Verwijderbare root-kwetsbaarheid in de IPv6-autoconfiguratiehandler op FreeBSD.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In de achtergrondprocessor rtsold en de tool rtsol die worden gebruikt in FreeBSD is een kwetsbaarheid ontdekt (CVE-2025-14558) die het mogelijk maakt om op afstand code met rootrechten uit te voeren door het verzenden van een speciaal gepakt IPv6-routeraankondigingspakket. RA-berichten (Router Advertisement), die de kwetsbaarheid exploiteren, worden niet gerouteerd en moeten door routers worden verworpen. Voor het uitvoeren van de aanval moet de aanvaller in staat zijn om een speciaal gepakt pakket te verzenden vanaf een systeem dat zich in hetzelfde netwerksegment bevindt als de kwetsbare host. <\/p>\n

De achtergrondprocessor rtsold wordt op hosts gebruikt voor automatische configuratie van verbindingen via IPv6 met behulp van het SLAAC-mechanisme (StateLess Address AutoConfiguration). De host verzendt een ICMPv6-bericht RS (Router Solicitation) in multicast-modus en wacht op het ontvangen van de antwoord-RAs (Router Advertisement) van routers, die informatie bevatten over netwerprefixen en configuratieparameters. De tool rtsol implementeert vergelijkbare functionaliteit zonder de achtergrondprocessor te starten. <\/p>\n

De kwetsbaarheid ontstaat doordat rtsold de in het RA-bericht gespecificeerde lijst 'domain search' zonder validatie en zonder escaping van speciale tekens naar de utility resolvconf doorstuurt. De utility resolvconf is een shell-script dat geen invoergegevens controleert. Om de kwetsbaarheid te exploiteren, is het voldoende om een RA-pakket te sturen met een naam domein<\/a>, waarin speciale tekens voorkomen, zoals 'test`id`test. De kwetsbaarheid is opgelost in de updates FreeBSD 15.0-RELEASE-p1, 14.3-RELEASE-p7, 13.5-RELEASE-p8. <\/p>\n

Bovendien is in de updates FreeBSD 14.3-RELEASE-p7 en 13.5-RELEASE-p8 (de tak 15.x is niet getroffen) de kwetsbaarheid (CVE-2025-14769) in de ipfw-pakketfilter opgelost, waardoor een denial-of-service-aanval via speciaal opgemaakte pakketten kan worden veroorzaakt. De kwetsbaarheid doet zich alleen voor bij gebruik van de 'tcp-setmss'-directive in de ipfw-regels. Het probleem ontstaat doordat de handler tcp-setmss onder bepaalde omstandigheden geheugen kan vrijgeven waarin de ontvangen gegevens van het pakket zijn opgeslagen, en een fout kan teruggeven. Deze fout werd genegeerd door de regelverwerkings engine, waardoor het volgende regel het doorgeven van een pakket kon toestaan, waarvan de gegevensbuffer al was vrijgegeven, wat leidt tot het dereferencen van een null-pointer.
\n
Bron: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e FreeBSD \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 rtsold \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 rtsol \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-14558), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 c \u0430\u043d\u043e\u043d\u0441\u043e\u043c IPv6-\u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430. 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\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 \u0430\u0432\u0442\u043e\u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 IPv6 \u0432\u043e FreeBSD | ProHoster","og:description":"\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e FreeBSD \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 rtsold \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 rtsol \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-14558), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 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