CVE-2020-13645 : What You Need to Know

In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This allows acceptance of a TLS certificate valid for any host.

Understanding CVE-2020-13645

This CVE highlights a vulnerability in GNOME glib-networking that affects the verification of server TLS certificates.

What is CVE-2020-13645?

The issue arises when the application does not provide the expected server identity, leading to the bypass of hostname verification in TLS certificates.

The Impact of CVE-2020-13645

This vulnerability allows malicious actors to potentially intercept communication by presenting a valid TLS certificate for any host, compromising the integrity and confidentiality of data.

Technical Details of CVE-2020-13645

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw in GTlsClientConnection in GNOME glib-networking allows the acceptance of TLS certificates without proper hostname verification.

Affected Systems and Versions

GNOME glib-networking through version 2.64.2
Balsa versions before 2.5.11 and 2.6.x before 2.6.1

Exploitation Mechanism

Attackers can exploit this vulnerability by presenting a valid TLS certificate for any host, bypassing hostname verification.

Mitigation and Prevention

Protecting systems from CVE-2020-13645 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update affected applications to versions that address the hostname verification issue.
Implement network monitoring to detect any unauthorized certificate usage.

Long-Term Security Practices

Enforce strict TLS certificate validation policies.
Regularly audit and update TLS configurations to ensure secure communication.

Patching and Updates

Apply patches provided by GNOME for glib-networking and Balsa to fix the hostname verification vulnerability.