CVE-2021-42548 : Security Advisory and Response

Insufficient Input Validation in the search functionality of Wordpress plugin Share-one-Drive prior to version 1.15.3 allows unauthenticated users to perform a reflected Cross-Site Scripting attack.

Understanding CVE-2021-42548

This CVE concerns a reflected XSS vulnerability in the search feature of the Share-one-Drive plugin by WP Cloud Plugins.

What is CVE-2021-42548?

This CVE describes a security issue in the Share-one-Drive plugin that enables unauthenticated users to execute a crafted reflected Cross-Site Scripting attack through the search feature.

The Impact of CVE-2021-42548

The vulnerability has a CVSS V3.1 base score of 4.7, with a Medium severity rating. Attack complexity is low, requiring user interaction, and impacting integrity and scope.

Technical Details of CVE-2021-42548

This section outlines the technical specifics of the CVE.

Vulnerability Description

The flaw in the Share-one-Drive plugin allows unauthenticated users to exploit insufficient input validation in the search functionality to launch a reflected XSS attack.

Affected Systems and Versions

Product: Share-one-Drive
Vendor: WP Cloud Plugins
Versions affected: < 1.15.3 (unspecified/custom configurations)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: Required

Mitigation and Prevention

Mitigation strategies and best practices to address CVE-2021-42548.

Immediate Steps to Take

Update the Share-one-Drive plugin to version 1.15.3 or later.
Implement Content Security Policy (CSP) headers to mitigate XSS attacks.

Long-Term Security Practices

Regularly update and patch all plugins and software to prevent vulnerabilities.
Conduct security assessments and penetration testing on WordPress installations.

Patching and Updates

Upgrade to Share-one-Drive version 1.15.3 or above to patch the XSS vulnerability.