CVE-2023-28803 : Security Advisory and Response

This CVE record was assigned by Zscaler and was published on October 23, 2023. It pertains to an authentication bypass vulnerability in Zscaler Client Connector affecting versions before 3.9.

Understanding CVE-2023-28803

This vulnerability allows for an authentication bypass by spoofing a device with a synthetic IP address in Zscaler Client Connector on Windows, potentially leading to a functionality bypass.

What is CVE-2023-28803?

The CVE-2023-28803 vulnerability involves an authentication bypass by spoofing a device with a synthetic IP address in Zscaler Client Connector on Windows, enabling a functionality bypass. This issue impacts versions of Client Connector before 3.9.

The Impact of CVE-2023-28803

The impact of CVE-2023-28803 is rated as medium severity, with a CVSS v3.1 base score of 5.9. It can compromise the confidentiality of information with high impact and has a low impact on integrity. The attack complexity is high, and the attack vector is through an adjacent network.

Technical Details of CVE-2023-28803

This section provides more specific technical details about the vulnerability.

Vulnerability Description

The vulnerability involves an authentication bypass by spoofing a device with a synthetic IP address in Zscaler Client Connector on Windows, leading to a functionality bypass.

Affected Systems and Versions

The vulnerability affects Zscaler Client Connector versions before 3.9 on Windows.

Exploitation Mechanism

Attackers can exploit this vulnerability by configuring a synthetic IP range as a local network, bypassing authentication mechanisms in Zscaler Client Connector.

Mitigation and Prevention

To address CVE-2023-28803 and enhance security measures, the following steps are recommended:

Immediate Steps to Take

Update Zscaler Client Connector to version 3.9 or higher to mitigate the vulnerability.
Monitor network traffic for any suspicious activity that may indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software and security patches to ensure protection against known vulnerabilities.
Implement strong authentication mechanisms and network access controls to prevent unauthorized access.

Patching and Updates

Stay informed about security updates and patches released by Zscaler for Client Connector. Regularly apply these updates to secure your systems against potential threats.