CVE-2020-9280 : What You Need to Know

SilverStripe through version 4.5 is vulnerable to a file upload issue affecting folders migrated from Silverstripe CMS 3.x.

Understanding CVE-2020-9280

In SilverStripe through version 4.5, a specific file upload vulnerability exists that impacts files uploaded via Forms to folders migrated from Silverstripe CMS 3.x.

What is CVE-2020-9280?

The vulnerability causes files uploaded after an upgrade to version 4.x to be placed in the default "/Uploads" folder instead of the intended location. This issue affects installations that previously utilized upload folder protection via the optional silverstripe/secureassets module under version 3.x.

The Impact of CVE-2020-9280

The vulnerability poses a risk to the confidentiality and integrity of uploaded files, potentially leading to unauthorized access or exposure of sensitive information.

Technical Details of CVE-2020-9280

SilverStripe through version 4.5 is susceptible to the following:

Vulnerability Description

Files uploaded via Forms to migrated folders may be redirected to the default "/Uploads" folder.

Affected Systems and Versions

SilverStripe installations that migrated from version 3.x to 4.x

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading files after the upgrade to version 4.x, leading to misplacement in the default folder.

Mitigation and Prevention

To address CVE-2020-9280, consider the following steps:

Immediate Steps to Take

Disable the silverstripe/secureassets module if not essential for operations.
Monitor file uploads and verify their correct placement.

Long-Term Security Practices

Regularly review and update file upload configurations.
Implement access controls and permissions for uploaded files.

Patching and Updates

Apply patches or updates provided by SilverStripe to mitigate the vulnerability.