CVE-2024-23184
dovecot - security update
Description
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.
How to fix CVE-2024-23184
To remediate CVE-2024-23184, upgrade the affected package to a fixed version below.
- —upgrade to 2.3.21.1-r0 or later
- —upgrade to 1:2.3.13+dfsg1-2+deb11u2 or later
- —upgrade to 1:2.3.13+dfsg1-2+deb11u2 or later
- —upgrade to 1:2.3.19.1+dfsg1-2.1+deb12u1 or later
Is CVE-2024-23184 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 2.3.21.1-r0
- from 0, < 1:2.3.13+dfsg1-2+deb11u2
- from 0, < 1:2.3.13+dfsg1-2+deb11u2
- from 0, < 1:2.3.19.1+dfsg1-2.1+deb12u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N |