{"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\/pt\/blog\/news\/opublikovan-exim-4-92-3-s-ustraneniem-chetvyortoj-za-god-kriticheskoj-uyazvimosti","title":{"rendered":"Publicado Exim 4.92.3 com a corre\u00e7\u00e3o da quarta vulnerabilidade cr\u00edtica do ano.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Publicado<\/a><\/noindex> lan\u00e7amento de emerg\u00eancia do servidor de e-mail Exim 4.92.3<\/a><\/noindex> com a corre\u00e7\u00e3o da vulnerabilidade uma vulnerabilidade cr\u00edtica<\/a><\/noindex> (CVE-2019-16928<\/a><\/noindex>), potencialmente permitindo a execu\u00e7\u00e3o remota de c\u00f3digo no servidor atrav\u00e9s do envio de uma string especialmente formatada no comando EHLO. A vulnerabilidade se manifesta ap\u00f3s a reinicializa\u00e7\u00e3o de privil\u00e9gios e \u00e9 limitada \u00e0 execu\u00e7\u00e3o de c\u00f3digo com os direitos de um usu\u00e1rio n\u00e3o privilegiado sob o qual o manipulador de mensagens recebidas \u00e9 executado.<\/p>\n

O problema ocorre apenas na vers\u00e3o Exim 4.92 (4.92.0, 4.92.1 e 4.92.2) e n\u00e3o se sobrep\u00f5e \u00e0 vulnerabilidade corrigida no in\u00edcio do m\u00eas CVE-2019-15846<\/a><\/noindex>. A vulnerabilidade \u00e9 causada por um estouro de buffer na fun\u00e7\u00e3o string_vformat()<\/a><\/noindex>, definida no arquivo string.c. A demonstrada exploit<\/a><\/noindex> permite provocar uma falha ao enviar uma string longa (v\u00e1rios kilobytes) no comando EHLO, mas a vulnerabilidade tamb\u00e9m pode ser explorada por meio de outros comandos e, potencialmente, pode ser utilizada para executar c\u00f3digo.<\/p>\n

N\u00e3o h\u00e1 contornos para bloquear a vulnerabilidade, portanto, recomenda-se que todos os usu\u00e1rios instalem urgentemente a atualiza\u00e7\u00e3o, apliquem patch<\/a><\/noindex> ou verifiquem se est\u00e3o utilizando pacotes fornecidos pelas distribui\u00e7\u00f5es que incorporaram as corre\u00e7\u00f5es das vulnerabilidades atuais. A corre\u00e7\u00e3o foi lan\u00e7ada para Ubuntu<\/a><\/noindex> (afeta somente a vers\u00e3o 19.04), EPEL para RHEL\/CentOS<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Debian<\/a><\/noindex> (afeta somente o Debian 10 Buster) e Fedora<\/a><\/noindex>. O RHEL e o CentOS n\u00e3o est\u00e3o afetados, pois o Exim n\u00e3o est\u00e1 inclu\u00eddo em seu reposit\u00f3rio oficial de pacotes (no EPEL7<\/a><\/noindex> atualiza\u00e7\u00e3o ainda \u00e9 inexistente<\/a><\/noindex>). No SUSE\/openSUSE, a vulnerabilidade n\u00e3o se manifesta devido ao uso da vers\u00e3o Exim 4.88.<\/p>\n

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

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

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