[USN-7013-1] Dovecot vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7013-1
September 16, 2024

dovecot vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

It was discovered that Dovecot incorrectly handled a large number of
address headers. A remote attacker could possibly use this issue to cause
Dovecot to consume resources, leading to a denial of service.
(CVE-2024-23184)

It was discovered that Dovecot incorrectly handled very large headers. A
remote attacker could possibly use this issue to cause Dovecot to consume
resources, leading to a denial of service. (CVE-2024-23185)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS
dovecot-core 1:2.3.16+dfsg1-3ubuntu2.4

Ubuntu 20.04 LTS
dovecot-core 1:2.3.7.2-1ubuntu3.7

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7013-1
CVE-2024-23184, CVE-2024-23185

Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.16+dfsg1-3ubuntu2.4
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.7.2-1ubuntu3.7