Dovecot: Multiple vulnerabilities — GLSA 202101-01

Multiple vulnerabilities have been found in Dovecot, the worst of which could allow remote attackers to cause a Denial of Service condition.

Affected packages

net-mail/dovecot on all architectures
Affected versions < 2.3.13
Unaffected versions >= 2.3.13

Background

Dovecot is an open source IMAP and POP3 email server.

Description

Multiple vulnerabilities have been discovered in Dovecot. Please review the CVE identifiers referenced below for details.

Impact

A remote attacker could send a specially crafted mail or send a specially crafted IMAP command possibly resulting in a Denial of Service condition or an authenticated remote attacker might be able to discover the file system directory structure and access other users’ emails.

Workaround

The information disclosure vulnerability can be mitigated by disabling IMAP hibernation feature which isn’t enabled by default.

Resolution

All Dovecot users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-mail/dovecot-2.3.13"
 

References

Release date
January 10, 2021

Latest revision
January 10, 2021: 1

Severity
normal

Exploitable
local, remote

Bugzilla entries