CVE-2020-28023 : Security Advisory and Response

Exim 4 before 4.94.2 allows Out-of-bounds Read, potentially disclosing sensitive information to an unauthenticated SMTP client.

Understanding CVE-2020-28023

Exim 4 vulnerability allowing Out-of-bounds Read and information disclosure.

What is CVE-2020-28023?

CVE-2020-28023 is a vulnerability in Exim 4 before version 4.94.2 that enables an Out-of-bounds Read, potentially leaking sensitive data to unauthorized SMTP clients.

The Impact of CVE-2020-28023

The vulnerability in Exim 4 could lead to the exposure of confidential information from process memory to unauthenticated SMTP clients, posing a risk of data compromise.

Technical Details of CVE-2020-28023

Exim 4 vulnerability specifics and affected systems.

Vulnerability Description

Exim 4 before 4.94.2 allows Out-of-bounds Read
smtp_setup_msg may disclose sensitive information from process memory

Affected Systems and Versions

Product: N/A
Vendor: N/A
Version: N/A

Exploitation Mechanism

The vulnerability can be exploited by an unauthenticated SMTP client to read sensitive data from the process memory.

Mitigation and Prevention

Steps to address and prevent CVE-2020-28023.

Immediate Steps to Take

Update Exim to version 4.94.2 or later to mitigate the vulnerability
Monitor SMTP traffic for any suspicious activities

Long-Term Security Practices

Regularly update and patch Exim installations
Implement network segmentation to limit exposure to potential threats

Patching and Updates

Apply patches and updates provided by Exim to address security vulnerabilities