{"id":81560,"date":"2020-05-14T19:42:19","date_gmt":"2020-05-14T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd"},"modified":"2020-05-14T19:42:19","modified_gmt":"2020-05-14T17:42:19","slug":"udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","title":{"rendered":"Udaljene ranjivosti u FreeBSD-u","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>U FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/thread.html\">otklonjene su<\/a><\/noindex> pet ranjivosti, me\u0111u kojima su problemi koji potencijalno mogu dovesti do prepisivanja podataka na razini jezgre prilikom slanja odre\u0111enih mre\u017enih paketa ili omogu\u0107uju lokalnom korisniku da pove\u0107a svoje privilegije. Ranjivosti su ispravljene u a\u017euriranjima 12.1-RELEASE-p5 i 11.3-RELEASE-p9. <\/p>\n<p>Najopasnija ranjivost (<noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001950.html\">CVE-2020-7454<\/a><\/noindex>) uzrokovana je nedostatkom odgovaraju\u0107e provjere veli\u010dine paketa u biblioteci libalias prilikom analiziranja protokola specifi\u010dnih zaglavlja. Biblioteka libalias se koristi u paketnom filtriranju ipfw za prevo\u0111enje adresa i uklju\u010duje standardne funkcije zamjene adresa u IP paketima i analize protokola. Ranjivost omogu\u0107ava putem slanja posebno oblikovanog mre\u017enog paketa \u010ditanje ili pisanje podataka u podru\u010dje memorije jezgre (prilikom kori\u0161tenja implementacije NAT u jezgru) ili procesa<br \/>\nnatd (prilikom kori\u0161tenja implementacije NAT u korisni\u010dkom prostoru). Problem ne utje\u010de na konfiguracije NAT izgra\u0111ene koriste\u0107i paketne filtre pf i ipf, kao ni na konfiguracije ipfw u kojima se ne koristi NAT. <\/p>\n<p>Ostale ranjivosti:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001951.html\">CVE-2020-7455<\/a><\/noindex> \u2014 jo\u0161 jedna udaljena ranjivost u libalias, povezana s pogre\u0161nim izra\u010dunom duljine paketa u FTP obradi. Problem se ograni\u010dava na otkrivanje nekoliko bajtova podataka iz podru\u010dja memorije jezgre ili procesa natd.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001953.html\">CVE-2019-15879<\/a><\/noindex> \u2014 ranjivost u modulu cryptodev, uzrokovana pristupom ve\u0107 oslobo\u0111enoj memorijskoj oblasti (use-after-free), koja omogu\u0107ava neprivilegiranom procesu prepisivanje proizvoljnih dijelova memorije jezgre. Kao zaobilazno rje\u0161enje za blokiranje ranjivosti, preporu\u010duje se isklju\u010divanje modula cryptodev s naredbom \u00abkldunload cryptodev\u00bb, ako je u\u010ditan (po defaultu cryptodev se ne u\u010ditava). Modul cryptodev omogu\u0107ava aplikacijama iz korisni\u010dkog prostora pristup su\u010delju \/dev\/crypto za pozivanje mehanizama hardverskog ubrzanja kriptografskih operacija (AES-NI i OpenSSL ne koriste \/dev\/crypto).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001954.html\">CVE-2019-15880<\/a><\/noindex> \u2014 druga ranjivost u cryptodev, koja omogu\u0107ava neprivilegiranom korisniku iniciranje ru\u0161enja jezgre slanjem zahtjeva za izvo\u0111enje kriptografske operacije s neispravnim MAC-om. Problem je uzrokovan nedostatkom provjere veli\u010dine MAC-klju\u010da pri alociranju bafera za njegovo pohranjivanje (bafer je kreiran na temelju korisni\u010dkih podataka o veli\u010dini, bez provjere stvarne veli\u010dine).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001952.html\">CVE-2019-15878<\/a><\/noindex> \u2014 ranjivost u implementaciji SCTP protokola (Stream Control Transmission Protocol), uzrokovana pogre\u0161nom provjerom dijeljenog klju\u010da, koji se koristi u SCTP-AUTH ekstenziji za autentifikaciju SCTP sekvenci. Lokalna aplikacija mo\u017ee putem Socket API-ja a\u017eurirati klju\u010d, istovremeno prekinuv\u0161i SCTP vezu, \u0161to dovodi do pristupa ve\u0107 oslobo\u0111enoj memorijskoj oblasti (use-after-free).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Izvor: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52948\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438\u043b\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.1-RELEASE-p5 \u0438 11.3-RELEASE-p9. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7454) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u0434\u043e\u043b\u0436\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u043f\u0430\u043a\u0435\u0442\u0430 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libalias \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0445 \u0434\u043b\u044f [&hellip;]<\/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-81560","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e.\" \/>\n\t<meta name=\"robots\" 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