CVE-2020-28025 : What You Need to Know

Exim 4 before 4.94.2 allows Out-of-bounds Read due to a validation issue in pdkim_finish_bodyhash, potentially leading to sensitive information leakage.

Understanding CVE-2020-28025

Exim vulnerability impacting versions prior to 4.94.2.

What is CVE-2020-28025?

Exim 4 before 4.94.2 is susceptible to an Out-of-bounds Read vulnerability, allowing crafted DKIM-Signature headers to expose sensitive data from process memory.

The Impact of CVE-2020-28025

Exploitation could result in the leakage of sensitive information stored in process memory.

Technical Details of CVE-2020-28025

Examination of the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from a lack of validation in pdkim_finish_bodyhash, enabling the exploitation of the Out-of-bounds Read flaw.

Affected Systems and Versions

Exim 4 versions before 4.94.2 are affected by this vulnerability.

Exploitation Mechanism

Crafted DKIM-Signature headers can be used to trigger the vulnerability and potentially leak sensitive information.

Mitigation and Prevention

Measures to address and prevent the CVE-2020-28025 vulnerability.

Immediate Steps to Take

Update Exim to version 4.94.2 or later to mitigate the vulnerability.
Monitor for any unusual activity that might indicate exploitation.

Long-Term Security Practices

Regularly update and patch Exim to ensure protection against known vulnerabilities.

Patching and Updates

Stay informed about security updates for Exim and promptly apply patches to secure the system.