CVE-2021-38371 Explained : Impact and Mitigation

This article provides details about CVE-2021-38371 which involves the STARTTLS feature in Exim through version 4.94.2, allowing response injection (buffering) during MTA SMTP sending.

Understanding CVE-2021-38371

This section delves into the impact, technical details, and mitigation strategies related to CVE-2021-38371.

What is CVE-2021-38371?

The vulnerability in the STARTTLS feature of Exim through version 4.94.2 enables response injection (buffering) during MTA SMTP sending, potentially leading to security breaches.

The Impact of CVE-2021-38371

The vulnerability could be exploited by threat actors to manipulate email communications, compromise data integrity, or launch more advanced cyber attacks.

Technical Details of CVE-2021-38371

Explore the specifics of the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The flaw allows threat actors to perform response injection (buffering) during MTA SMTP sending, exploiting the STARTTLS feature in Exim.

Affected Systems and Versions

Exim versions up to 4.94.2 are affected by this vulnerability, potentially putting systems at risk of exploitation.

Exploitation Mechanism

Attackers can inject responses during SMTP sending, utilizing the STARTTLS feature to compromise email security and integrity.

Mitigation and Prevention

Discover the immediate and long-term measures to prevent exploitation and secure affected systems.

Immediate Steps to Take

Users are advised to apply security patches and updates promptly, monitor network traffic, and implement additional security controls to mitigate risks.

Long-Term Security Practices

Regular security assessments, training employees on email security best practices, and maintaining up-to-date threat intelligence can enhance overall cybersecurity posture.

Patching and Updates

Refer to official sources like Exim's website and relevant security advisories for patch availability and installation instructions.