CVE-2019-16378 : Security Advisory and Response

OpenDMARC versions 1.3.2 and 1.4.x up to 1.4.0-Beta1 are vulnerable to a signature bypass issue when multiple From: addresses are present. This vulnerability could impact applications relying on domain names for email message origin determination.

Understanding CVE-2019-16378

OpenDMARC versions 1.3.2 and 1.4.x up to 1.4.0-Beta1 are susceptible to a security flaw that allows the bypassing of signatures when multiple From: addresses are used.

What is CVE-2019-16378?

OpenDMARC through versions 1.3.2 and 1.4.x up to 1.4.0-Beta1 is prone to a signature-bypass vulnerability with multiple From: addresses, potentially affecting applications that consider a domain name relevant to the origin of an email message.

The Impact of CVE-2019-16378

This vulnerability could allow malicious actors to bypass email signatures, potentially leading to spoofing attacks and compromising the integrity of email communication.

Technical Details of CVE-2019-16378

OpenDMARC versions 1.3.2 and 1.4.x up to 1.4.0-Beta1 are affected by a signature bypass vulnerability when multiple From: addresses are present.

Vulnerability Description

The vulnerability in OpenDMARC allows for the bypassing of signatures when multiple From: addresses are included in an email, potentially impacting the verification process.

Affected Systems and Versions

OpenDMARC versions 1.3.2 and 1.4.x up to 1.4.0-Beta1

Exploitation Mechanism

The vulnerability can be exploited by including multiple From: addresses in an email, tricking the system into bypassing signature checks.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-16378.

Immediate Steps to Take

Update OpenDMARC to a patched version that addresses the signature bypass vulnerability.
Monitor email communications for any suspicious activity that may indicate exploitation of the vulnerability.

Long-Term Security Practices

Implement email security best practices to enhance overall email security.
Educate users on email security awareness and the importance of verifying email sources.

Patching and Updates

Regularly check for security updates and patches for OpenDMARC to ensure protection against known vulnerabilities.