CVE-2020-13962 : Vulnerability Insights and Analysis

Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, potentially leading to denial of service to QSslSocket users.

Understanding CVE-2020-13962

This CVE involves a vulnerability in Qt versions 5.12.2 through 5.14.2, impacting unofficial builds of Mumble 1.3.0 and other related products.

What is CVE-2020-13962?

Qt versions 5.12.2 through 5.14.2 mishandle OpenSSL's error queue
This mishandling can result in a denial of service for QSslSocket users
Errors leaking in unrelated TLS sessions may cause disconnection when any handshake fails
Mumble 1.3.1 remains unaffected regardless of the Qt version

The Impact of CVE-2020-13962

Denial of service vulnerability affecting QSslSocket users
Potential disconnection of unrelated sessions due to error leakage

Technical Details of CVE-2020-13962

This section provides technical insights into the vulnerability.

Vulnerability Description

Qt versions 5.12.2 through 5.14.2 mishandle OpenSSL's error queue
Errors can lead to a denial of service for QSslSocket users

Affected Systems and Versions

Qt versions 5.12.2 through 5.14.2
Unofficial builds of Mumble 1.3.0 and related products

Exploitation Mechanism

Errors leaking in unrelated TLS sessions
Disconnection of unrelated sessions when any handshake fails

Mitigation and Prevention

Protecting systems from the CVE-2020-13962 vulnerability is crucial.

Immediate Steps to Take

Update Qt to versions beyond 5.14.2
Use official builds of Mumble 1.3.1 or newer

Long-Term Security Practices

Regularly update software and libraries
Monitor security advisories for patches and updates

Patching and Updates

Apply patches provided by Qt and Mumble developers
Stay informed about security fixes and updates