CVE-2020-24613 : Security Advisory and Response

wolfSSL before 4.5.0 mishandles TLS 1.3 server data in the WAIT_CERT_CR state, allowing attackers to impersonate TLS 1.3 servers.

Understanding CVE-2020-24613

This CVE involves a vulnerability in wolfSSL that could be exploited by attackers in a privileged network position.

What is CVE-2020-24613?

The vulnerability in wolfSSL before version 4.5.0 allows attackers to impersonate TLS 1.3 servers, potentially compromising sensitive information exchanged between clients and servers.

The Impact of CVE-2020-24613

Attackers can completely impersonate any TLS 1.3 servers using wolfSSL.
They can read or modify potentially sensitive information transmitted between clients and servers.

Technical Details of CVE-2020-24613

This section provides more technical insights into the vulnerability.

Vulnerability Description

wolfSSL before 4.5.0 mishandles TLS 1.3 server data in the WAIT_CERT_CR state.
The issue lies within SanityCheckTls13MsgReceived() in tls13.c.

Affected Systems and Versions

Product: wolfSSL
Vendor: N/A
Versions affected: N/A

Exploitation Mechanism

Attackers in a privileged network position can exploit this vulnerability to impersonate TLS 1.3 servers.

Mitigation and Prevention

Protecting systems from CVE-2020-24613 is crucial to ensure security.

Immediate Steps to Take

Update wolfSSL to version 4.5.0 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update software and libraries to patch known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories and promptly apply patches to secure systems.