CVE-2020-28200 : What You Need to Know

Dovecot before version 2.3.15 is affected by a vulnerability that allows Uncontrolled Resource Consumption due to a complex regular expression in the Sieve engine.

Understanding CVE-2020-28200

This CVE involves a specific vulnerability in Dovecot that can lead to resource consumption issues.

What is CVE-2020-28200?

The Sieve engine in Dovecot before version 2.3.15 is susceptible to Uncontrolled Resource Consumption, triggered by a complex regular expression for the regex extension.

The Impact of CVE-2020-28200

The impact of this vulnerability is rated as MEDIUM with a CVSS base score of 4.3. It has a low attack complexity and requires low privileges to exploit, posing a risk to network availability.

Technical Details of CVE-2020-28200

This section covers the technical aspects of the CVE.

Vulnerability Description

The vulnerability allows for Uncontrolled Resource Consumption in Dovecot's Sieve engine when processing complex regular expressions.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

The vulnerability can be exploited remotely with a low attack complexity, impacting network availability.

Mitigation and Prevention

Protecting systems from CVE-2020-28200 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Dovecot to version 2.3.15 or newer to mitigate the vulnerability.
Monitor system resources for any unusual consumption that could indicate exploitation.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Ensure timely patching and updates for Dovecot to address vulnerabilities and enhance system security.