{"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\/ro\/blog\/news\/opublikovan-exim-4-92-3-s-ustraneniem-chetvyortoj-za-god-kriticheskoj-uyazvimosti","title":{"rendered":"A fost publicat Exim 4.92.3 cu remedierea celei de-a patra vulnerabilit\u0103\u021bi critice din acest an.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Publicat<\/a><\/noindex> versiune de urgen\u021b\u0103 a serverului de email Exim 4.92.3<\/a><\/noindex> cu remedierea unei vulnerabilit\u0103\u021bi critice<\/a><\/noindex> (CVE-2019-16928<\/a><\/noindex>), care permite \u00een mod poten\u021bial executarea de cod de la distan\u021b\u0103 pe server prin transmiterea unui \u0219ir special formulat \u00een comanda EHLO. Vulnerabilitatea este activ\u0103 dup\u0103 resetarea privilegiilor \u0219i este limitat\u0103 la executarea codului cu drepturi de utilizator neprivilegiate, sub care ruleaz\u0103 procesorul mesajelor primite.<\/p>\n

Problema apare doar \u00een ramura Exim 4.92 (4.92.0, 4.92.1 \u0219i 4.92.2) \u0219i nu se suprapune cu vulnerabilitatea remediat\u0103 la \u00eenceputul lunii CVE-2019-15846<\/a><\/noindex>. Vulnerabilitatea este cauzat\u0103 de o dep\u0103\u0219ire a buffer-ului \u00een func\u021bia string_vformat()<\/a><\/noindex>, definit\u0103 \u00een fi\u0219ierul string.c. Exploitul demonstrat Exploatarea este posibil\u0103 \u00een configura\u021biile nginx \u00een care redirec\u021bionarea c\u0103tre PHP-FPM este efectuat\u0103 cu separarea p\u0103r\u021bilor URL prin \u201efastcgi_split_path_info\u201d \u0219i definirea variabilei de mediu PATH_INFO, dar f\u0103r\u0103 o verificare prealabil\u0103 a existen\u021bei fi\u0219ierului prin directiva \u201etry_files $fastcgi_script_name\u201d sau construc\u021bia \u201eif (!-f $document_root$fastcgi_script_name)\u201d. Problema se reg\u0103se\u0219te \u0219i<\/a><\/noindex> Nu exist\u0103 c\u0103i de ocolire pentru blocarea vulnerabilit\u0103\u021bii, a\u0219a c\u0103 tuturor utilizatorilor li se recomand\u0103 s\u0103 instaleze urgent actualizarea, s\u0103 aplice<\/p>\n

sau s\u0103 se asigure c\u0103 folosesc pachetele furnizate de distribu\u021bii, \u00een care au fost incluse remedierile pentru vulnerabilit\u0103\u021bile actuale. Remedierea a fost lansat\u0103 pentru patch<\/a><\/noindex> (se aplic\u0103 doar ramurii 19.04), Ubuntu<\/a><\/noindex> (se aplic\u0103 doar Debian 10 Buster) \u0219i Arch Linux<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Debian<\/a><\/noindex> . RHEL \u0219i CentOS nu sunt afectate de problem\u0103, deoarece Exim nu face parte din repository-ul lor standard de pachete (\u00een Fedora<\/a><\/noindex>EPEL7 actualizarea este \u00eenc\u0103<\/a><\/noindex> inexistent\u0103 ). \u00cen SUSE\/openSUSE, vulnerabilitatea nu se manifest\u0103 din cauza utiliz\u0103rii ramurii Exim 4.88.<\/a><\/noindex>Solu\u021bia hiperconvergent\u0103 AERODISK vAIR. Baza - sistemul de fi\u0219iere ARDFS<\/p>\n

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

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

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