Vulnerability · Published Sep 10, 2024 · Assigned by OX
CVE-2024-23184
Medium 5.0
In plain English
A medium-severity resource allocation without limits in OX Dovecot Pro from Open-Xchange GmbH. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | dovecot | 1:2.3.16-6.el8_10 | ALSA-2024:6973 |
| AlmaLinux:9 | dovecot | 1:2.3.16-11.el9_4.1 | ALSA-2024:6529 |
| AlmaLinux:8 | dovecot-devel | 1:2.3.16-6.el8_10 | ALSA-2024:6973 |
| AlmaLinux:9 | dovecot-devel | 1:2.3.16-11.el9_4.1 | ALSA-2024:6529 |
| AlmaLinux:8 | dovecot-mysql | 1:2.3.16-6.el8_10 | ALSA-2024:6973 |
| AlmaLinux:9 | dovecot-mysql | 1:2.3.16-11.el9_4.1 | ALSA-2024:6529 |
| AlmaLinux:8 | dovecot-pgsql | 1:2.3.16-6.el8_10 | ALSA-2024:6973 |
| AlmaLinux:9 | dovecot-pgsql | 1:2.3.16-11.el9_4.1 | ALSA-2024:6529 |
| AlmaLinux:8 | dovecot-pigeonhole | 1:2.3.16-6.el8_10 | ALSA-2024:6973 |
| AlmaLinux:9 | dovecot-pigeonhole | 1:2.3.16-11.el9_4.1 | ALSA-2024:6529 |
| Alpine:v3.21 | dovecot | 2.3.21.1-r0 | ALPINE-CVE-2024-23184 |
| Alpine:v3.22 | dovecot | 2.3.21.1-r0 | ALPINE-CVE-2024-23184 |
| Alpine:v3.23 | dovecot | 2.3.21.1-r0 | ALPINE-CVE-2024-23184 |
| Alpine:v3.24 | dovecot | 2.3.21.1-r0 | ALPINE-CVE-2024-23184 |
| Debian:12 | dovecot | 1:2.3.19.1+dfsg1-2.1+deb12u1 | DSA-5752-1 |
| Debian:12 | dovecot | 1:2.3.19.1+dfsg1-2.1+deb12u1 | DEBIAN-CVE-2024-23184 |
| Debian:13 | dovecot | 1:2.3.21.1+dfsg1-1 | DEBIAN-CVE-2024-23184 |
| Debian:14 | dovecot | 1:2.3.21.1+dfsg1-1 | DEBIAN-CVE-2024-23184 |
| Rocky Linux:8 | dovecot | 1:2.3.16-6.el8_10 | RLSA-2024:6973 |
| Rocky Linux:9 | dovecot | 1:2.3.16-11.el9_4.1 | RLSA-2024:6529 |
| Ubuntu:22.04:LTS | dovecot | 1:2.3.16+dfsg1-3ubuntu2.4 | USN-7013-1 |
| Ubuntu:22.04:LTS | dovecot | 1:2.3.16+dfsg1-3ubuntu2.4 | UBUNTU-CVE-2024-23184 |
| Ubuntu:24.04:LTS | dovecot | 1:2.3.21+dfsg1-2ubuntu6 | UBUNTU-CVE-2024-23184 |
| Ubuntu:24.04:LTS | dovecot | 1:2.3.21+dfsg1-2ubuntu6 | USN-6982-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro | 0 – through 2.3.21 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N