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Ubuntu: USN-4456-1 Critical: Dovecot Denial of Service Issues

ubuntu
Calendar Grey August 12, 2020
Dist Ubuntu Esm H88
Multiple vulnerabilities have been identified in Postfix that necessitate urgent patches to avoid disruptions on Fedora systems.
Several security issues were fixed in Dovecot.

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)

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu Dovecot resource consumption

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://ubuntu.com/security/notices/USN-4456-1

CVE-2020-12100, CVE-2020-12673, CVE-2020-12674

Severity
critical
Lowest
Low
Medium
High
Critical

August 12, 2020

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu Dovecot resource consumption

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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