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Ubuntu Security Notice USN-4456-1

Ubuntu Security Notice USN-4456-1
Posted Aug 12, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4456-1 - 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. 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2020-12100, CVE-2020-12673, CVE-2020-12674
SHA-256 | 92f79dc3df0ec06f5cefb85e621601251c661132d679e69cee61a4bcdc9ff89a

Ubuntu Security Notice USN-4456-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4456-1
August 12, 2020

dovecot vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
dovecot-core 1:2.3.7.2-1ubuntu3.2

Ubuntu 18.04 LTS:
dovecot-core 1:2.2.33.2-1ubuntu4.6

Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.13

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4456-1
CVE-2020-12100, CVE-2020-12673, CVE-2020-12674

Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.7.2-1ubuntu3.2
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.6
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.13
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