CVE-2020-28018 : Security Advisory and Response

Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.

Understanding CVE-2020-28018

Exim vulnerability allowing Use After Free in specific scenarios.

What is CVE-2020-28018?

CVE-2020-28018 is a vulnerability in Exim 4 before version 4.94.2 that enables Use After Free in the smtp_reset function, particularly prevalent in builds using OpenSSL.

The Impact of CVE-2020-28018

This vulnerability could be exploited by attackers to execute arbitrary code or cause a denial of service (DoS) on affected systems.

Technical Details of CVE-2020-28018

Examination of the technical aspects of the CVE-2020-28018 vulnerability.

Vulnerability Description

Exim 4 before 4.94.2 is susceptible to Use After Free in smtp_reset.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: N/A

Exploitation Mechanism

Attackers can leverage this vulnerability to trigger arbitrary code execution or DoS attacks.

Mitigation and Prevention

Measures to address and prevent the CVE-2020-28018 vulnerability.

Immediate Steps to Take

Update Exim to version 4.94.2 or later to mitigate the vulnerability.
Monitor for any unusual activities on the system.

Long-Term Security Practices

Regularly update and patch Exim and other software to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.
Stay informed about security advisories and best practices in secure email server configurations.

Patching and Updates

Apply patches and updates provided by Exim promptly to address security issues and enhance system protection.