CVE-2023-6545 : What You Need to Know

This CVE-2023-6545 was published on December 14, 2023, by CERTVDE. It involves an open redirect vulnerability in the authelia-bhf package of Beckhoff's TwinCAT/BSD.

Understanding CVE-2023-6545

This CVE highlights a security flaw in the authelia-bhf package that allows a remote unprivileged attacker to redirect users to another site, impacting the integrity of the system. This vulnerability specifically affects the Beckhoff fork of authelia.

What is CVE-2023-6545?

The vulnerability in authelia-bhf of TwinCAT/BSD included in Beckhoff's system enables an attacker to redirect users to malicious sites, potentially compromising the users' security and data integrity.

The Impact of CVE-2023-6545

The impact of this vulnerability is considered medium with a base score of 4.3. While confidentiality impact is none, the integrity impact is low. This vulnerability does not require privileges and has a low attack complexity, but user interaction is required for exploitation.

Technical Details of CVE-2023-6545

This section delves into the specifics of the vulnerability, including its description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability lies in the authelia-bhf package, allowing unprivileged remote attackers to perform an open redirect attack that can lead users to unintended and potentially malicious websites.

Affected Systems and Versions

The vulnerability affects Beckhoff's TwinCAT/BSD with authelia-bhf versions less than 4.37.5.

Exploitation Mechanism

Attackers can exploit this vulnerability remotely over the network without the need for any special privileges. User interaction is required for redirecting users to malicious sites.

Mitigation and Prevention

In order to mitigate the risks associated with CVE-2023-6545, immediate steps can be taken and long-term security practices can be implemented.

Immediate Steps to Take

Consider updating the authelia-bhf package to version 4.37.5 or above to mitigate the vulnerability.
Monitor network traffic for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch software to ensure that known vulnerabilities are addressed promptly.
Implement network security measures to detect and prevent unauthorized access and malicious activities.

Patching and Updates

Refer to the advisories provided by CERTVDE and Beckhoff for detailed information on patching and updating systems to address CVE-2023-6545.