Advisory Published

USN-4456-1: Dovecot vulnerabilities

First published: Wed Aug 12 2020(Updated: )

It was discovered that Dovecot incorrectly handled deeply nested MIME parts. A remote attacker could possibly use this issue to cause Dovecot to consume resources, resulting in a denial of service. (CVE-2020-12100) It was discovered that Dovecot incorrectly handled memory when using NTLM. A remote attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12673) It was discovered that the Dovecot RPA mechanism incorrectly handled zero-length messages. A remote attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/dovecot-core<1:2.3.7.2-1ubuntu3.2
1:2.3.7.2-1ubuntu3.2
=20.04
All of
ubuntu/dovecot-core<1:2.2.33.2-1ubuntu4.6
1:2.2.33.2-1ubuntu4.6
=18.04
All of
ubuntu/dovecot-core<1:2.2.22-1ubuntu2.13
1:2.2.22-1ubuntu2.13
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4456-1?

    The severity of USN-4456-1 is moderate.

  • What are the affected versions of Dovecot in USN-4456-1?

    The affected versions of Dovecot in USN-4456-1 are 2.3.7.2-1ubuntu3.2, 2.2.33.2-1ubuntu4.6, and 2.2.22-1ubuntu2.13.

  • How can an attacker exploit CVE-2020-12100?

    An attacker can exploit CVE-2020-12100 by sending specially crafted deeply nested MIME parts, causing Dovecot to consume resources and resulting in a denial of service.

  • How can an attacker exploit the memory handling vulnerability in Dovecot?

    An attacker can exploit the memory handling vulnerability in Dovecot when using NTLM, allowing them to possibly execute arbitrary code or cause a denial of service.

  • How can I fix the vulnerabilities in Dovecot?

    To fix the vulnerabilities in Dovecot, update to the specific remedy versions provided by Ubuntu: 1:2.3.7.2-1ubuntu3.2, 1:2.2.33.2-1ubuntu4.6, or 1:2.2.22-1ubuntu2.13.

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