{"id":38530,"date":"2019-10-31T22:24:20","date_gmt":"2019-10-31T19:24:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/opublikovan-exim-4-92-3-s-ustraneniem-chetvyortoj-za-god-kriticheskoj-uyazvimosti\/"},"modified":"2019-10-31T22:24:20","modified_gmt":"2019-10-31T19:24:20","slug":"opublikovan-exim-4-92-3-s-ustraneniem-chetvyortoj-za-god-kriticheskoj-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/opublikovan-exim-4-92-3-s-ustraneniem-chetvyortoj-za-god-kriticheskoj-uyazvimosti","title":{"rendered":"Avaldatud on Exim 4.92.3, mis k\u00f5rvaldab aasta neljanda kriitilise haavatavuse.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avaldatud<\/a><\/noindex> \u00fcllatuslik v\u00e4ljaanne postiserverist Exim 4.92.3<\/a><\/noindex> j\u00e4rgmistest probleemidest kriitiline haavatavus<\/a><\/noindex> (CVE-2019-16928<\/a><\/noindex>), mis v\u00f5imaldab potentsiaalselt kaugelt koodi serverisse k\u00e4ivitada, edastades spetsiaalselt vormindatud stringi EHLO k\u00e4sus. Haavatavus ilmneb privileegide taastamise etapis ja on piiratud koodi k\u00e4itamisega tavalise kasutaja \u00f5igustes, kelle all toimub sissetulevate s\u00f5numite t\u00f6\u00f6tlemine.<\/p>\n

Probleem ilmneb ainult Exim 4.92 harus (4.92.0, 4.92.1 ja 4.92.2) ning ei \u00fchti kuu alguses parandatud haavatavusega CVE-2019-15846<\/a><\/noindex>. Haavatavus on p\u00f5hjustatud puhver\u00fcletusest funktsioonis string_vformat()<\/a><\/noindex>, mis on m\u00e4\u00e4ratletud failis string.c. Demonstratiivne eksploit<\/a><\/noindex> lubab kokku kukkuda, edastades pika stringi (mitu kilobaiti) EHLO k\u00e4sklusse, kuid haavatavust saab \u00e4ra kasutada ka teiste k\u00e4skude kaudu ning see v\u00f5ib potentsiaalselt v\u00f5imaldada koodi k\u00e4ivitamist.<\/p>\n

Haavatavuse blokeerimise v\u00f5imalusi ei ole, seega soovitatakse k\u00f5igil kasutajatel viivitamatult installida v\u00e4rskendus, rakendada plekk<\/a><\/noindex> v\u00f5i veenduda, et pakettide, mida jaotused sisaldavad, on ajakohased turvapaigatud. Parandus on v\u00e4lja antud Ubuntu<\/a><\/noindex> (kehtib ainult versiooni 19.04 puhul), Arch Linuxis<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Debian<\/a><\/noindex> (kehtib ainult Debian 10 Buster) ja Fedora<\/a><\/noindex>. RHEL ja CentOS ei ole riskis, kuna Exim ei kuulu nende ametlikku pakettide hoidlasse (t EPEL7<\/a><\/noindex> uuendus on veel on puudub<\/a><\/noindex>). SUSE\/openSUSE puhul ei ilmne haavatavust, kuna kasutatakse Exim versiooni 4.88.<\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0435 EHLO. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430 \u0441\u0442\u0430\u0434\u0438\u0438 \u043f\u043e\u0441\u043b\u0435 \u0441\u0431\u0440\u043e\u0441\u0430 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u043f\u043e\u0434 \u043a\u043e\u0442\u043e\u0440\u044b\u043c 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