{"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\/pt\/blog\/news\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","title":{"rendered":"Vulnerabilidade remota de root no manipulador de autoconfigura\u00e7\u00e3o IPv6 no FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Foi identificada uma vulnerabilidade no processo em segundo plano rtsold e na ferramenta rtsol utilizada no FreeBSD (CVE-2025-14558), que permite a execu\u00e7\u00e3o remota de c\u00f3digo com privil\u00e9gios de root atrav\u00e9s do envio de um pacote especialmente formatado com um an\u00fancio de roteador IPv6. As mensagens RA (Router Advertisement), atrav\u00e9s das quais a vulnerabilidade \u00e9 explorada, n\u00e3o s\u00e3o roteadas e devem ser descartadas pelos roteadores. Para realizar o ataque, o invasor deve ter a capacidade de enviar um pacote especialmente formatado de um sistema que esteja na mesma segmenta\u00e7\u00e3o de rede que o host vulner\u00e1vel. <\/p>\n

O processo em segundo plano rtsold \u00e9 utilizado em hosts para a autoconfigura\u00e7\u00e3o de conex\u00e3o via IPv6 usando o mecanismo SLAAC (Configura\u00e7\u00e3o Autom\u00e1tica de Endere\u00e7o Stateless). O host envia uma mensagem ICMPv6 RS (Router Solicitation) em modo multicast e aguarda a recep\u00e7\u00e3o de mensagens RA (Router Advertisement) de roteadores, contendo informa\u00e7\u00f5es sobre prefixos de rede e par\u00e2metros de configura\u00e7\u00e3o. A ferramenta rtsol implementa funcionalidade semelhante sem iniciar um processo em segundo plano. <\/p>\n

A vulnerabilidade \u00e9 causada pelo fato de que o rtsold passa a lista de \"domain search\" especificada na mensagem RA para a ferramenta resolvconf sem validar a integridade e sem escapar caracteres especiais. A ferramenta resolvconf \u00e9 um script shell que n\u00e3o verifica os dados de entrada. Para explorar a vulnerabilidade, basta enviar um pacote RA com o nome de dom\u00ednio<\/a>, que contenha caracteres especiais, como \"test`id`test. A vulnerabilidade foi corrigida nas atualiza\u00e7\u00f5es FreeBSD 15.0-RELEASE-p1, 14.3-RELEASE-p7, 13.5-RELEASE-p8. <\/p>\n

Al\u00e9m disso, as atualiza\u00e7\u00f5es FreeBSD 14.3-RELEASE-p7 e 13.5-RELEASE-p8 (a vers\u00e3o 15.x n\u00e3o \u00e9 afetada) corrigiram a vulnerabilidade (CVE-2025-14769) no filtro de pacotes ipfw, que permite causar uma nega\u00e7\u00e3o de servi\u00e7o atrav\u00e9s do envio de pacotes especialmente formatados. A vulnerabilidade se manifesta apenas ao usar a diretiva \"tcp-setmss\" nas regras do ipfw. O problema \u00e9 causado pelo fato de que o manipulador tcp-setmss, em determinadas circunst\u00e2ncias, pode liberar a mem\u00f3ria onde os dados recebidos do pacote est\u00e3o armazenados e retornar um erro. O erro indicado era ignorado pelo motor de processamento de regras, resultando na possibilidade de que a regra seguinte permitisse a passagem de um pacote cujo buffer de dados j\u00e1 havia sido liberado, levando ao dereferenciamento de um ponteiro nulo.
\n
Fonte: 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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