CVE-2019-14664 : Exploit Details and Defense Strategies

Enigmail below version 2.1 is susceptible to an attack where encrypted emails can be covertly included in a multipart email, potentially leaking plaintext content to attackers.

Understanding CVE-2019-14664

Enigmail versions below 2.1 are vulnerable to a sophisticated attack that can compromise the confidentiality of encrypted emails.

What is CVE-2019-14664?

Attackers can embed PGP encrypted emails within a carefully crafted multipart email.
Encrypted sections can be concealed using HTML/CSS or ASCII newline characters.
The modified email can appear harmless and be resent to the recipient.
If the recipient replies, they inadvertently disclose plaintext contents back to the attacker.
This attack bypasses protection measures implemented post the "EFAIL" attacks.

The Impact of CVE-2019-14664

Allows attackers to extract plaintext content from encrypted emails.
Compromises the confidentiality of sensitive information.

Technical Details of CVE-2019-14664

Enigmail vulnerability details and affected systems.

Vulnerability Description

Enigmail below version 2.1 allows covert inclusion of encrypted emails in multipart emails.
Attackers can exploit this to extract plaintext content.

Affected Systems and Versions

Enigmail versions below 2.1 are affected.

Exploitation Mechanism

Attackers can hide encrypted sections within multipart emails using various techniques.

Mitigation and Prevention

Protective measures to mitigate the CVE-2019-14664 vulnerability.

Immediate Steps to Take

Update Enigmail to version 2.1 or above.
Avoid replying to suspicious or unexpected emails.

Long-Term Security Practices

Regularly update software and security patches.
Educate users on email security best practices.

Patching and Updates

Stay informed about security advisories and apply patches promptly.