Dovecot CVE-2019-19722 Denial of Service Vulnerability

Description

Dovecot is prone to a remote denial-of-service vulnerability. Attackers can exploit this issue to crash the affected application, denying service to legitimate users. Dovecot versions 2.3.9 and 2.3.9.1 are vulnerable.

Technologies Affected

• Dovecot Dovecot 2.3.9
• Dovecot Dovecot 2.3.9.1

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to detect and block attacks and anomalous activity such as requests containing suspicious URI sequences. Since the webserver may log such requests, review its logs regularly.

Updates are available. Please see the references or vendor advisory for more information.