CVE-2021-43853 : Security Advisory and Response
Understand the impact of CVE-2021-43853 on Ajax.NET Professional. Learn about the vulnerability allowing cross-site scripting attacks in versions < 21.12.22.1. Take immediate steps and follow long-term security practices for mitigation.
Ajax.NET Professional (AjaxPro) is an AJAX framework for Microsoft ASP.NET, with versions prior to 21.12.22.1 vulnerable to JavaScript object injection, potentially leading to cross-site scripting.
Understanding CVE-2021-43853
What is CVE-2021-43853?
Ajax.NET Professional is susceptible to a JavaScript object injection issue, enabling cross-site scripting attacks when exploited by malicious actors. This vulnerability lies in the core's handling of JSON input.
The Impact of CVE-2021-43853
This vulnerability has a high severity score of 8.7 (CVSS:3.1) with high impacts on confidentiality and integrity. The attack complexity is low, requiring user interaction, and the attack vector is through the network.
Technical Details of CVE-2021-43853
Vulnerability Description
The flaw in Ajax.NET Professional allows for the injection of malicious JavaScript objects, leading to potential cross-site scripting attacks.
Affected Systems and Versions
- Product: Ajax.NET-Professional
- Vendor: michaelschwarz
- Versions Affected: < 21.12.22.1
Exploitation Mechanism
The vulnerability arises from how the framework handles JSON input, enabling attackers to inject harmful JavaScript objects.
Mitigation and Prevention
Immediate Steps to Take
- Upgrade to version 21.12.22.1 or later to mitigate the vulnerability.
- Apply the workaround detailed in the provided GHSA-5q7q-qqw2-hjq7 advisory.
Long-Term Security Practices
- Regularly update software and libraries to the latest versions.
- Implement secure coding practices to prevent injection attacks.
Patching and Updates
Ensure timely installation of security patches and updates from michaelschwarz for Ajax.NET Professional.