CVE-2020-12460 : What You Need to Know

OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 has a vulnerability that can lead to remote memory corruption due to improper null termination.

Understanding CVE-2020-12460

This CVE involves a one-byte heap overflow in opendmarc_xml when processing a specially crafted DMARC aggregate report.

What is CVE-2020-12460?

The vulnerability in OpenDMARC can be exploited to cause remote memory corruption by overwriting heap metadata.

The Impact of CVE-2020-12460

The exploitation of this vulnerability can result in remote memory corruption, potentially leading to a denial of service or arbitrary code execution.

Technical Details of CVE-2020-12460

OpenDMARC vulnerability details and affected systems.

Vulnerability Description

The issue arises from improper null termination in the function opendmarc_xml_parse, leading to a one-byte heap overflow in opendmarc_xml.

Affected Systems and Versions

OpenDMARC through version 1.3.2
OpenDMARC 1.4.x through 1.4.0-Beta1

Exploitation Mechanism

By crafting a specific DMARC aggregate report, attackers can trigger the vulnerability, causing a one-byte heap overflow and subsequent memory corruption.

Mitigation and Prevention

Protecting systems from CVE-2020-12460.

Immediate Steps to Take

Apply security patches provided by the OpenDMARC project promptly.
Monitor vendor advisories and security mailing lists for updates.
Implement network security measures to detect and block malicious traffic.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security assessments and audits to identify and mitigate potential risks.
Educate users and IT staff on best practices for email security and threat awareness.

Patching and Updates

Ensure that OpenDMARC is updated to a patched version that addresses the heap overflow vulnerability.