CVE-2020-28014 : Exploit Details and Defense Strategies

Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges. The -oP option is available to the exim user, and allows a denial of service because root-owned files can be overwritten.

Understanding CVE-2020-28014

Exim 4 before 4.94.2 vulnerability allowing Execution with Unnecessary Privileges.

What is CVE-2020-28014?

CVE-2020-28014 is a vulnerability in Exim 4 before version 4.94.2 that permits Execution with Unnecessary Privileges. The issue arises from the availability of the -oP option to the exim user, enabling a denial of service by overwriting root-owned files.

The Impact of CVE-2020-28014

This vulnerability can lead to a denial of service attack due to unauthorized overwriting of critical system files by the exim user.

Technical Details of CVE-2020-28014

Examine the technical aspects of this CVE.

Vulnerability Description

Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges, posing a risk of unauthorized file overwriting.

Affected Systems and Versions

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

Exploitation Mechanism

The -oP option available to the exim user can be exploited to overwrite root-owned files, leading to a denial of service.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2020-28014.

Immediate Steps to Take

Update Exim to version 4.94.2 or later to patch the vulnerability.
Restrict access to the -oP option to prevent unauthorized file overwriting.

Long-Term Security Practices

Regularly monitor and update Exim to ensure the latest security patches are applied.
Implement least privilege access to limit the impact of potential vulnerabilities.

Patching and Updates

Apply patches and updates provided by Exim promptly to address security vulnerabilities.