Ve FreeBSD byla nalezena zranitelnost (CVE-2022-23093) v n\u00e1stroji ping, kter\u00fd je sou\u010d\u00e1st\u00ed z\u00e1kladn\u00ed instalace. Probl\u00e9m m\u016f\u017ee potenci\u00e1ln\u011b v\u00e9st k vzd\u00e1len\u00e9mu spu\u0161t\u011bn\u00ed k\u00f3du s pr\u00e1vy root p\u0159i kontrole pomoc\u00ed ping extern\u00edho hostitele, kter\u00e9ho ovl\u00e1d\u00e1 \u00fato\u010dn\u00edk. Oprava byla navr\u017eena v aktualizac\u00edch FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 a 12.3-RELEASE-p10. Zda jsou jin\u00e9 syst\u00e9my BSD touto zranitelnost\u00ed ovlivn\u011bny, zat\u00edm nen\u00ed jasn\u00e9 (zpr\u00e1vy o zranitelnosti v NetBSD, DragonFlyBSD a OpenBSD zat\u00edm nebyly zve\u0159ejn\u011bny). <\/p>\n
Zranitelnost je zp\u016fsobena p\u0159ete\u010den\u00edm z\u00e1sobn\u00edku v k\u00f3du pro zpracov\u00e1n\u00ed ICMP zpr\u00e1v, kter\u00e9 p\u0159ich\u00e1zej\u00ed jako odpov\u011b\u010f na ov\u011b\u0159ovac\u00ed dotaz. K\u00f3d pro odes\u00edl\u00e1n\u00ed a p\u0159\u00edjem ICMP zpr\u00e1v v n\u00e1stroji ping vyu\u017e\u00edv\u00e1 raw sokety a b\u011b\u017e\u00ed s zv\u00fd\u0161en\u00fdmi privilegii (n\u00e1stroj je dod\u00e1v\u00e1n s flagem setuid root). Zpracov\u00e1n\u00ed odpov\u011bdi se prov\u00e1d\u00ed na stran\u011b n\u00e1stroje ping rekonstrukc\u00ed IP a ICMP hlavi\u010dek paket\u016f z\u00edskan\u00fdch z raw soketu. Vy\u010dlen\u011bn\u00e9 IP a ICMP hlavi\u010dky jsou kop\u00edrov\u00e1ny funkc\u00ed pr_pack() do z\u00e1sobn\u00edk\u016f, ani\u017e by se braly v \u00favahu dal\u0161\u00ed roz\u0161\u00ed\u0159en\u00e9 hlavi\u010dky, kter\u00e9 mohou b\u00fdt v paketu za IP hlavi\u010dkou. <\/p>\n
Takov\u00e9 hlavi\u010dky jsou vy\u010dlen\u011bny z paketu a zahrnuty do bloku hlavi\u010dek, ale nejsou zohledn\u011bny p\u0159i v\u00fdpo\u010dtu velikosti z\u00e1sobn\u00edku. Pokud host na odeslan\u00fd ICMP dotaz vr\u00e1t\u00ed paket s dal\u0161\u00edmi hlavi\u010dkami, jejich obsah bude zaps\u00e1n do oblasti za hranic\u00ed z\u00e1sobn\u00edku ve stohu. V d\u016fsledku toho m\u016f\u017ee \u00fato\u010dn\u00edk p\u0159epsat a\u017e 40 bajt\u016f dat ve stohu, co\u017e potenci\u00e1ln\u011b umo\u017e\u0148uje vykon\u00e1n\u00ed jeho k\u00f3du. Nebezpe\u010d\u00ed probl\u00e9mu zm\u00edr\u0148uje skute\u010dnost, \u017ee v okam\u017eiku vzniku chyby se proces nach\u00e1z\u00ed v re\u017eimu izolace syst\u00e9mov\u00fdch vol\u00e1n\u00ed (capability mode), co\u017e zt\u011b\u017euje p\u0159\u00edstup k zbytku syst\u00e9mu po vyu\u017eit\u00ed zranitelnosti. \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\udd47Vzd\u00e1len\u011b zneu\u017eiteln\u00e1 root zranitelnost v n\u00e1stroji ping dod\u00e1van\u00e9m ve FreeBSD | ProHoster","description":"Ve FreeBSD byla nalezena zranitelnost (CVE-2022-23093) v n\u00e1stroji ping, kter\u00fd je sou\u010d\u00e1st\u00ed z\u00e1kladn\u00ed instalace.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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 \u043f\u043e\u0441\u0442\u0430\u0432\u043a\u0443.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-12-01T13:37:11+00:00","article:modified_time":"2022-12-01T13:37:11+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/105776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=105776"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/105776\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=105776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=105776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=105776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"