CVE-2020-24386

dovecot: IMAP hibernation function allows mail access

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages (and path disclosure).

Se detectó un problema en Dovecot versiones anteriores a 2.3.13. Al usar IMAP IDLE, un atacante autenticado puede desencadenar la inhibición por medio de parámetros controlados por el atacante, conllevando a un acceso a los mensajes de correo electrónico de otros usuarios (y a una divulgación de ruta).

It was discovered that Dovecot incorrectly handled certain imap hibernation commands. A remote authenticated attacker could possibly use this issue to access other users' email. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME parsing. A remote attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-08-19 CVE Reserved
2021-01-04 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-138: Improper Neutralization of Special Elements

CAPEC

References (11)

URL	Tag	Source
http://packetstormsecurity.com/files/160842/Dovecot-2.3.11.3-Access-Bypass.html	Mailing List
http://seclists.org/fulldisclosure/2021/Jan/18	Mailing List
http://www.openwall.com/lists/oss-security/2021/01/04/4	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://doc.dovecot.org/configuration_manual/hibernation	2023-11-07
https://dovecot.org/pipermail/dovecot-news/2021-January/000450.html	2023-11-07
https://dovecot.org/security	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GXDKFLOCUP7I4ELGQ2F4P5TGC6NXMYV7	2023-11-07
https://security.gentoo.org/glsa/202101-01	2023-11-07
https://www.debian.org/security/2021/dsa-4825	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-24386	2021-05-18
https://bugzilla.redhat.com/show_bug.cgi?id=1912455	2021-05-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Dovecot Search vendor "Dovecot"		Dovecot Search vendor "Dovecot" for product "Dovecot"				>= 2.2.26 < 2.3.13 Search vendor "Dovecot" for product "Dovecot" and version " >= 2.2.26 < 2.3.13"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected