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Alerts This Week
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Fedora 39 Dovecot Update: Excessive CPU Usage and Header Limits

fedora
Calendar Grey August 28, 2024
Dist Fedora Esm H88
Notable Dovecot enhancements for Fedora 39 improving CPU load and constraints on email header dimensions. Update today to maintain security.
CVE-2024-23184: A large number of address headers in email resulted in excessive CPU usage

Summary

Dovecot is an IMAP server for Linux/UNIX-like systems, written with security

primarily in mind. It also contains a small POP3 server. It supports mail

in either of maildir or mbox formats.

The SQL drivers and authentication plug-ins are in their subpackages.

Update Information:

CVE-2024-23184: A large number of address headers in email resulted in excessive CPU usage. CVE-2024-23185: Abnormally large email headers are now truncated or discarded, with a limit of 10MB on a single header and 50MB for all the headers of all the parts of an email.

Topics%20covered

Topics Covered

security advisory security update Fedora email headers dovecot CPU usage size limit

Change Log

* Mon Aug 19 2024 Michal Hlavinka - 1:2.3.21.1-1 - updated to 2.3.21.1(2304907) * Wed Jul 17 2024 Fedora Release Engineering - 1:2.3.21-9 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild * Tue Jun 18 2024 Michal Hlavinka - 1:2.3.21-8 - fix sieve crash when there are two missing optional scripts - Do not use deprecated OpenSSL v3 ENGINE API - Drop dependency on libstemmer on RHEL * Tue Mar 26 2024 Michal Hlavinka - 1:2.3.21-7 - drop i686 build as per https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval * Wed Jan 31 2024 Pete Walter - 1:2.3.21-6 - Rebuild for ICU 74 * Wed Jan 24 2024 Fedora Release Engineering - 1:2.3.21-5 - Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild * Fri Jan 19 2024 Fedora Release Engineering - 1:2.3.21-4 - Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild

References

Fedora Update Notification FEDORA-2024-ba5bb9f63a 2024-08-28 02:20:34.962027 Name : dovecot Product : Fedora 39 Version : 2.3.21.1 Release : 1.fc39 URL : https://dovecot.org/ Summary : Secure imap and pop3 server Description : Dovecot is an IMAP server for Linux/UNIX-like systems, written with security primarily in mind. It also contains a small POP3 server. It supports mail in either of maildir or mbox formats. The SQL drivers and authentication plug-ins are in their subpackages.

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2024-ba5bb9f63a' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
important
Lowest
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Critical

Name: dovecot
Product: Fedora 39
Version: 2.3.21.1
Release: 1.fc39
URL: https://dovecot.org/
Summary: Secure imap and pop3 server

Topics%20covered

Topics Covered

security advisory security update Fedora email headers dovecot CPU usage size limit

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