{"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\/en\/blog\/news\/kriticheskaya-uyazvimost-v-imap-servere-dovecot","title":{"rendered":"Critical vulnerability in the Dovecot IMAP server","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In corrective releases<\/a><\/noindex> POP3\/IMAP4 servers Dovecot<\/a><\/noindex> 2.3.7.2 and 2.2.36.4, as well as in addition Pigeonhole 0.5.7.2 and 0.4.24.2 <\/a><\/noindex>, fixed critical vulnerability<\/a><\/noindex> (CVE-2019-11500<\/a><\/noindex>), which allows data to be written outside the allocated buffer through sending a specially crafted request over the IMAP or ManageSieve protocols. <\/p>\n

The issue can be exploited at the stage before authentication. A working exploit has not yet been prepared, but Dovecot developers do not rule out the possibility of using the vulnerability to carry out remote code execution attacks in the system or to leak confidential data. All users are strongly recommended to urgently install updates (Debian<\/a><\/noindex>, Alpine<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, openSUSE<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>).<\/p>\n

The vulnerability exists in the IMAP and ManageSieve protocol parsers and is caused by improper handling of null characters during the parsing of data within quoted strings. The problem allows arbitrary data to be written to objects stored beyond allocated buffer limits (up to 8 KB before authentication and up to 64 KB after authentication). <\/p>\n

According to GSMArena, it is Wi-Fi 5, similar to the 4G model.<\/a><\/noindex> Engineers from Red Hat note that the use of these problems for real attacks is complicated by the fact that an attacker cannot control the position of arbitrary data overwrites in the heap. In response, it is suggested that this characteristic significantly complicates the attack, but does not eliminate the possibility of carrying it out \u2014 the attacker can repeatedly attempt exploitation until they hit a viable area in the heap.<\/p>\n

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

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

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