CVE-2020-15953 : Security Advisory and Response

LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. This vulnerability allows a meddler-in-the-middle attacker to inject responses in a TLS context.

Understanding CVE-2020-15953

This CVE identifies a security vulnerability in LibEtPan that impacts various email protocols.

What is CVE-2020-15953?

CVE-2020-15953 refers to a STARTTLS buffering issue in LibEtPan, affecting IMAP, SMTP, and POP3 protocols. It allows attackers to inject responses in a TLS context.

The Impact of CVE-2020-15953

The vulnerability can be exploited by a man-in-the-middle attacker to manipulate data exchanged between email servers and clients, potentially leading to unauthorized access or data theft.

Technical Details of CVE-2020-15953

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability in LibEtPan allows an attacker to inject responses in a TLS context, exploiting the STARTTLS buffering issue.

Affected Systems and Versions

LibEtPan through version 1.9.4
MailCore 2 through version 0.6.3

Exploitation Mechanism

Attacker intercepts communication between email servers and clients
Injects malicious responses during TLS negotiation

Mitigation and Prevention

Protecting systems from CVE-2020-15953 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update LibEtPan and MailCore to patched versions
Monitor network traffic for suspicious activities
Implement encryption and authentication mechanisms

Long-Term Security Practices

Regularly update software and security patches
Conduct security audits and penetration testing
Educate users on email security best practices

Patching and Updates

Apply patches provided by LibEtPan and MailCore developers
Stay informed about security advisories and updates from relevant vendors