Gentoo Linux Security Advisory 202101-1 - Multiple vulnerabilities have been found in Dovecot, the worst of which could allow remote attackers to cause a Denial of Service condition. Versions less than 2.3.13 are affected.
3a89fff6479017300d6ec9a323c8b69eDovecot versions 2.2.26 through 2.3.11.3 suffer from a bypass issue. When imap hibernation is active, an attacker can cause Dovecot to discover file system directory structure and access other users' emails using a specially crafted command. The attacker must have valid credentials to access the mail server.
5f6ec291becfdbef0390d40207572b2bUbuntu Security Notice 4674-1 - It was discovered that Dovecot incorrectly handled certain imap hibernation commands. A remote authenticated attacker could possibly use this issue to access other users' email. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME parsing. A remote attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service. Various other issues were also addressed.
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