CVE-2023-31133 : Security Advisory and Response

This CVE involves a vulnerability in Ghost, an app for new-media creators, that allows disclosure of private API fields. Learn more about the impact, technical details, and mitigation strategies related to CVE-2023-31133.

Understanding CVE-2023-31133

Ghost is an app designed for new-media creators, enabling them to build websites, publish content, send newsletters, and manage paid subscriptions. However, a vulnerability in versions prior to 5.46.1 exposes private fields through the public API endpoints.

What is CVE-2023-31133?

Prior to Ghost version 5.46.1, a lack of validation in filtering public API endpoints allows unauthorized access to private API fields, potentially leading to exposure of sensitive information.

The Impact of CVE-2023-31133

The vulnerability poses a high risk, with a CVSS base score of 7.5 (High Severity). It can result in the disclosure of confidential information to unauthorized actors, affecting the integrity of the system.

Technical Details of CVE-2023-31133

The following technical details shed light on the vulnerability in Ghost:

Vulnerability Description

Due to inadequate validation in public API endpoint filtering, attackers can exploit the vulnerability to expose private fields and access sensitive information through brute force attacks.

Affected Systems and Versions

Users running Ghost versions below 5.46.1 are impacted by this vulnerability. Ghost(Pro) has been patched, but self-hosted instances require immediate attention to safeguard against data exposure.

Exploitation Mechanism

Attackers can leverage brute force attacks on public API endpoints to gain access to private fields, including sensitive information such as passwords and email addresses.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-31133, consider the following:

Immediate Steps to Take

Update Ghost to version 5.46.1 to apply the necessary fix for this vulnerability.
Implement a workaround by blocking requests to

/ghost/api/content/*

with the

filter

query parameter containing

password

or

email

.

Long-Term Security Practices

Regularly monitor for security advisories and updates released by Ghost to stay informed about potential vulnerabilities.
Conduct security audits on the Ghost platform to identify and address any security gaps that may exist.

Patching and Updates

Stay proactive in applying patches and updates provided by Ghost to ensure that the platform remains secure and protected against potential threats.