CVE-2020-11414 : Exploit Details and Defense Strategies

An issue was discovered in Progress Telerik UI for Silverlight before 2020.1.330 that could allow crafted web requests to upload files to arbitrary locations.

Understanding CVE-2020-11414

This CVE identifies a vulnerability in Telerik UI for Silverlight that could be exploited to upload files to unauthorized locations.

What is CVE-2020-11414?

The RadUploadHandler class in RadUpload for Silverlight expects a web request with the file location of the uploading file. Prior to version 2020.1.330, a malicious request could lead to uploads in unintended directories.

The Impact of CVE-2020-11414

The vulnerability could be exploited by attackers to upload files to arbitrary locations, potentially leading to unauthorized access or data leakage.

Technical Details of CVE-2020-11414

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The issue arises from the RadUploadHandler class not properly validating file upload locations, allowing crafted requests to upload files to unintended directories.

Affected Systems and Versions

Product: Progress Telerik UI for Silverlight
Versions affected: Before 2020.1.330

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a specially crafted web request to the RadUploadHandler class, enabling them to upload files to locations outside the intended directory.

Mitigation and Prevention

Protecting systems from CVE-2020-11414 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update to version 2020.1.330 or later to mitigate the vulnerability.
Monitor file upload activities for suspicious behavior.

Long-Term Security Practices

Implement proper input validation and access controls in web applications.
Regularly review and update security configurations to prevent similar vulnerabilities.
Educate developers on secure coding practices to avoid future issues.

Patching and Updates

Apply patches and updates provided by Progress Telerik to address the vulnerability and enhance system security.