CVE-2020-24408 : Security Advisory and Response

Magento versions 2.4.0 and 2.3.5p1 are affected by a persistent XSS vulnerability that allows malicious JavaScript upload, potentially leading to XSS attacks.

Understanding CVE-2020-24408

Magento Commerce, owned by Adobe, is susceptible to a stored XSS vulnerability that could be exploited by unauthenticated attackers.

What is CVE-2020-24408?

Magento versions 2.4.0 and 2.3.5p1 are vulnerable to persistent XSS attacks through the file upload feature.
Attackers can upload malicious JavaScript, enabling them to execute XSS attacks on other Magento users.
The vulnerability necessitates the victim to access the uploaded file.

The Impact of CVE-2020-24408

CVSS Base Score: 6.1 (Medium Severity)
Attack Vector: Network
Attack Complexity: Low
User Interaction: Required
Scope: Changed
Confidentiality Impact: Low
Integrity Impact: Low
Privileges Required: None
Availability Impact: None

Technical Details of CVE-2020-24408

Vulnerability Description

The vulnerability allows for the upload of malicious JavaScript via the file upload component, leading to stored XSS attacks.

Affected Systems and Versions

Magento Commerce versions 2.4.0 and 2.3.5p1 are confirmed to be impacted.

Exploitation Mechanism

Unauthenticated attackers can exploit this vulnerability by uploading malicious JavaScript and tricking victims into accessing the file.

Mitigation and Prevention

Immediate Steps to Take

Update Magento Commerce to versions beyond 2.4.0 or 2.3.5p1 to mitigate the vulnerability.
Regularly monitor and review file uploads for any suspicious activity.

Long-Term Security Practices

Educate users on safe browsing practices and the risks associated with opening files from unknown sources.
Implement strict file upload policies and consider restricting file types that can be uploaded.

Patching and Updates

Apply security patches provided by Adobe promptly to address known vulnerabilities.