{"id":37658,"date":"2019-10-31T22:18:53","date_gmt":"2019-10-31T19:18:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kriticheskaya-uyazvimost-v-imap-servere-dovecot\/"},"modified":"2019-10-31T22:18:53","modified_gmt":"2019-10-31T19:18:53","slug":"kriticheskaya-uyazvimost-v-imap-servere-dovecot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/kriticheskaya-uyazvimost-v-imap-servere-dovecot","title":{"rendered":"Kritisk s\u00e5rbarhed i Dovecot IMAP-serveren","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I korrekturer udgivelser<\/a><\/noindex> POP3\/IMAP4-servere Dovecot<\/a><\/noindex> 2.3.7.2 og 2.2.36.4, samt i till\u00e6g Pigeonhole 0.5.7.2 og 0.4.24.2 <\/a><\/noindex>, forbedret en kritisk s\u00e5rbarhed<\/a><\/noindex> (CVE-2019-11500<\/a><\/noindex>), der g\u00f8r det muligt at optage data uden for den tildelte buffer ved at sende en specielt udformet anmodning via protokollerne IMAP eller ManageSieve. <\/p>\n

Problemet kan udnyttes f\u00f8r autentificeringen. Der er ikke udarbejdet en fungerende udnyttelse endnu, men udviklerne af Dovecot udelukker ikke, at s\u00e5rbarheden kan bruges til at organisere angreb vedr\u00f8rende fjernudf\u00f8relse af kode i systemet eller til at organisere l\u00e6kage af fortrolige data. Alle brugere anbefales straks at installere opdateringer (Debian<\/a><\/noindex>, Fedora<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>, RHEL<\/a><\/noindex>, FreeBSD<\/a><\/noindex>).<\/p>\n

S\u00e5rbarheden findes i parserne for protokollerne IMAP og ManageSieve og skyldes en forkert h\u00e5ndtering af null-tegn i processen med at analysere data inden for strengene omkranset af citationstegn. Problemet muligg\u00f8r optagelse af vilk\u00e5rlige data i objekter, der opbevares uden for den tildelte buffer (f\u00f8r autentificeringen kan der overskrives op til 8 Kb, og efter autentificeringen op til 64 Kb). <\/p>\n

If\u00f8lge mening<\/a><\/noindex> Ingeni\u00f8rer fra Red Hat mener, at udnyttelse af problemerne til reelle angreb er vanskeliggjort af, at angriberen ikke kan kontrollere positionen af vilk\u00e5rlig datagenopskrivning i hukommelsen. Som svar fremf\u00f8res det, at denne egenskab v\u00e6sentligt komplicerer angrebet, men ikke udelukker dets gennemf\u00f8relse \u2014 angriberen kan gentagne gange fors\u00f8ge at udnytte s\u00e5rbarheden, indtil han rammer et arbejdsv\u00e6relse i hukommelsen.<\/p>\n

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

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

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