CVE-2021-28141 Explained : Impact and Mitigation

Progress Telerik UI for ASP.NET AJAX 2021.1.224 has a vulnerability that allows unauthorized access to MicrosoftAjax.js through the Telerik.Web.UI.WebResource.axd file, potentially leading to server access and code execution. Although the vendor disputes this as a vulnerability, the exploit involves injecting a command in the URI.

Understanding CVE-2021-28141

This CVE describes a vulnerability in Progress Telerik UI for ASP.NET AJAX 2021.1.224, enabling unauthorized access to a critical file and potentially allowing attackers to execute malicious code on the server.

What is CVE-2021-28141?

The vulnerability in Progress Telerik UI for ASP.NET AJAX 2021.1.224 facilitates unauthorized access to MicrosoftAjax.js through a specific file, which can be exploited to gain unauthorized server access and execute code.

The Impact of CVE-2021-28141

Exploiting this vulnerability may result in unauthorized access to the server and the execution of malicious code by injecting commands within the URI. While the vendor disputes its severity, the exploit poses a threat to the server's security.

Technical Details of CVE-2021-28141

This section covers the specific technical aspects of the vulnerability.

Vulnerability Description

The vulnerability in Progress Telerik UI for ASP.NET AJAX 2021.1.224 allows unauthorized access to MicrosoftAjax.js through a specific file, potentially leading to unauthorized server access and code execution by injecting commands in the URI.

Affected Systems and Versions

The affected system is Progress Telerik UI for ASP.NET AJAX 2021.1.224. Users of this version should be cautious of the potential vulnerability and take appropriate actions to mitigate the risk.

Exploitation Mechanism

To exploit the vulnerability, attackers must use the parameter TSM_HiddenField and inject a command at the end of the URI. This exploitation may grant unauthorized access to the server and enable malicious code execution.

Mitigation and Prevention

Protecting your system from CVE-2021-28141 involves immediate steps and long-term security practices.

Immediate Steps to Take

Immediately restrict access to the vulnerable file and implement any vendor-recommended security patches or workarounds to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly update your Progress Telerik UI software, monitor for security advisories, and follow best security practices to enhance your system's overall security posture.

Patching and Updates

Ensure timely installation of security patches provided by Progress Telerik UI to address known vulnerabilities, including the specific issue highlighted in CVE-2021-28141.