CVE-2017-3733 : Security Advisory and Response

OpenSSL versions prior to 1.1.0e may crash during a handshake renegotiation when the Encrypt-Then-Mac extension is negotiated. This impacts both clients and servers.

Understanding CVE-2017-3733

This CVE involves a vulnerability in OpenSSL that can lead to crashes during handshake renegotiations.

What is CVE-2017-3733?

OpenSSL versions before 1.1.0e can crash during a handshake renegotiation if the Encrypt-Then-Mac extension is negotiated incorrectly.
The vulnerability affects both clients and servers.

The Impact of CVE-2017-3733

The vulnerability can cause crashes in OpenSSL during handshake renegotiations.
This issue poses a risk to the stability and security of affected systems.

Technical Details of CVE-2017-3733

This section provides more technical insights into the vulnerability.

Vulnerability Description

OpenSSL versions prior to 1.1.0e may crash during handshake renegotiations if the Encrypt-Then-Mac extension is negotiated incorrectly.

Affected Systems and Versions

Affected Product: OpenSSL
Affected Versions: openssl-1.1.0, openssl-1.1.0a, openssl-1.1.0b, openssl-1.1.0c, openssl-1.1.0d

Exploitation Mechanism

The vulnerability occurs during a renegotiation handshake when the Encrypt-Then-Mac extension is negotiated incorrectly.

Mitigation and Prevention

Protecting systems from CVE-2017-3733 is crucial to maintaining security.

Immediate Steps to Take

Update OpenSSL to version 1.1.0e or newer to mitigate the vulnerability.
Monitor for any unusual behavior that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update and patch OpenSSL to ensure the latest security fixes are in place.
Implement network security measures to detect and prevent potential attacks.

Patching and Updates

Stay informed about security advisories and updates from OpenSSL to address vulnerabilities promptly.