CVE-2024-23184 Affecting dovecot package, versions <1:2.3.21+dfsg1-2ubuntu6


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.21% (44th percentile)

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  • Snyk IDSNYK-UBUNTU2404-DOVECOT-7830406
  • published2 Sept 2024
  • disclosed10 Sept 2024

Introduced: 2 Sep 2024

CVE-2024-23184  (opens in a new tab)

How to fix?

Upgrade Ubuntu:24.04 dovecot to version 1:2.3.21+dfsg1-2ubuntu6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dovecot package and not the dovecot package as distributed by Ubuntu. See How to fix? for Ubuntu:24.04 relevant fixed versions and status.

Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.

CVSS Base Scores

version 3.1