Foi identificada uma vulnerabilidade no FreeBSD (CVE-2022-23093) na utilidade ping, que faz parte da instala\u00e7\u00e3o b\u00e1sica. O problema pode potencialmente levar \u00e0 execu\u00e7\u00e3o remota de c\u00f3digo com privil\u00e9gios de root ao verificar um host externo controlado por um atacante. A corre\u00e7\u00e3o foi proposta nas atualiza\u00e7\u00f5es do FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 e 12.3-RELEASE-p10. N\u00e3o est\u00e1 claro se outras sistemas BSD est\u00e3o vulner\u00e1veis, pois n\u00e3o existem relat\u00f3rios de vulnerabilidade para NetBSD, DragonFlyBSD e OpenBSD at\u00e9 o momento. <\/p>\n
A vulnerabilidade \u00e9 causada por um estouro de buffer no c\u00f3digo de an\u00e1lise de mensagens ICMP que s\u00e3o recebidas em resposta a um pedido de verifica\u00e7\u00e3o. O c\u00f3digo de envio e recep\u00e7\u00e3o de mensagens ICMP no ping utiliza sockets raw e \u00e9 executado com privil\u00e9gios elevados (a utilidade \u00e9 fornecida com a flag setuid root). O tratamento da resposta \u00e9 realizado pelo ping atrav\u00e9s da reconfigura\u00e7\u00e3o dos cabe\u00e7alhos IP e ICMP dos pacotes recebidos do socket raw. Os cabe\u00e7alhos IP e ICMP alocados s\u00e3o copiados pela fun\u00e7\u00e3o pr_pack() para buffers, sem considerar que podem haver cabe\u00e7alhos adicionais expandidos ap\u00f3s o cabe\u00e7alho IP no pacote. <\/p>\n
Cabe\u00e7alhos semelhantes s\u00e3o alocados a partir do pacote e inclu\u00eddos no bloco de cabe\u00e7alhos, mas n\u00e3o s\u00e3o contabilizados no c\u00e1lculo do tamanho do buffer. Se o host retornar um pacote com cabe\u00e7alhos adicionais em resposta ao ICMP solicitador, seu conte\u00fado ser\u00e1 gravado em uma \u00e1rea fora do buffer na pilha. Como resultado, um atacante pode sobrescrever at\u00e9 40 bytes de dados na pilha, o que potencialmente pode permitir a execu\u00e7\u00e3o de seu c\u00f3digo. A gravidade do problema \u00e9 atenuada pelo fato de que, no momento da manifesta\u00e7\u00e3o do erro, o processo est\u00e1 em um estado de isolamento de chamadas de sistema (modo de capacidade), o que dificulta o acesso ao restante do sistema ap\u00f3s a explora\u00e7\u00e3o da vulnerabilidade. \u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-23093) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0431\u0430\u0437\u043e\u0432\u0443\u044e \u043f\u043e\u0441\u0442\u0430\u0432\u043a\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 ping \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0445\u043e\u0441\u0442\u0430, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 \u0438 12.3-RELEASE-p10. \u041f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u043b\u0438 \u0434\u0440\u0443\u0433\u0438\u0435 BSD-\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435 \u044f\u0441\u043d\u043e (\u043e\u0442\u0447\u0451\u0442\u043e\u0432 \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 NetBSD, […]<\/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-105776","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilidade root explor\u00e1vel remotamente na utilidade ping fornecida no FreeBSD | ProHoster","description":"Foi identificada uma vulnerabilidade no FreeBSD (CVE-2022-23093) na utilidade ping, que faz parte da instala\u00e7\u00e3o b\u00e1sica.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","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 \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f root-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u0432\u043e FreeBSD | ProHoster","og:description":"\u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-23093) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0431\u0430\u0437\u043e\u0432\u0443\u044e 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"