Input validation error in Dovecot - CVE-2020-25275

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Main Vulnerability Database Vulnerabilities #VU49238

Input validation error in Dovecot - CVE-2020-25275

Published: January 4, 2021


Vulnerability identifier: #VU49238
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-25275
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing messages with more than 10 000 MIME parts. A remote attacker can send a specially crafted message to the application and perform a denial of service (DoS) attack.

Note, this vulnerability was introduced by the fix for #VU45671.


Affected software

Dovecot
Arch Linux
Gentoo Linux
Red Hat Enterprise Linux for x86_64
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Ubuntu
openEuler
Fedora
dovecot (Debian package)
dovecot (Red Hat package)
dovecot (Alpine package)
dovecot-core (Ubuntu package)
dovecot
dovecot-help
dovecot-devel
dovecot-debuginfo
dovecot-debugsource

How to mitigate CVE-2020-25275

Install updates from vendor's website.

Dovecot - update to 2.3.13
dovecot (Debian package) - update to 2.3.4.1-5+deb10u5
dovecot (Red Hat package) - update to 2.3.8-9.el8
dovecot (Alpine package) - update to 2.3.13-r0
dovecot-core (Ubuntu package) - addressed in versions 1:2.2.9-1ubuntu2.6+esm4, 1:2.2.22-1ubuntu2.14, 1:2.2.33.2-1ubuntu4.7, 1:2.3.7.2-1ubuntu3.3, 1:2.3.11.3+dfsg1-2ubuntu0.1
dovecot - update to 2.3.10.1-4
dovecot-help - update to 2.3.10.1-4
dovecot-devel - update to 2.3.10.1-4
dovecot-debuginfo - update to 2.3.10.1-4
dovecot-debugsource - update to 2.3.10.1-4
dovecot - addressed in versions 2.3.13-1.fc32, 2.3.13-1.fc33, 2.3.13-2.fc32

External References

Related Security Bulletins