CVE-2023-30845 : What You Need to Know

This article provides detailed information on CVE-2023-30845, a vulnerability affecting GoogleCloudPlatform's ESPv2 service proxy.

Understanding CVE-2023-30845

This section delves into the nature of the CVE and its implications.

What is CVE-2023-30845?

ESPv2 2.20.0 through 2.42.0 is susceptible to an authentication bypass vulnerability, allowing attackers to circumvent JWT authentication by manipulating the

X-HTTP-Method-Override

header.

The Impact of CVE-2023-30845

The vulnerability enables malicious requests to evade authentication measures, potentially leading to unauthorized access to sensitive data and services.

Technical Details of CVE-2023-30845

This section outlines the specifics of the vulnerability.

Vulnerability Description

Attackers can exploit ESPv2 by sending crafted requests with a malicious

X-HTTP-Method-Override

value that bypasses JWT authentication under specific conditions.

Affected Systems and Versions

GoogleCloudPlatform's ESPv2 versions between 2.20.0 and 2.42.0 are impacted by this vulnerability.

Exploitation Mechanism

By manipulating the

X-HTTP-Method-Override

header, attackers can bypass JWT authentication in scenarios where the specified method is not defined in the API service.

Mitigation and Prevention

This section discusses strategies to address and prevent the exploitation of CVE-2023-30845.

Immediate Steps to Take

Upgrade affected deployments to version 2.43.0 or higher to apply the necessary patch that ensures JWT authentication is enforced, even when

x-http-method-override

is specified.

Long-Term Security Practices

Implement robust API security measures, such as access controls and monitoring, to fortify defenses against similar vulnerabilities and unauthorized access attempts.

Patching and Updates

Ensure timely application of security patches and updates to mitigate the risks posed by CVE-2023-30845 and other potential vulnerabilities.