CVE-2021-22849 : Exploit Details and Defense Strategies

Hyweb HyCMS-J1 backend editing function is vulnerable to a Stored Cross-site Scripting (XSS) attack due to improper filtering of special characters. An attacker can inject malicious JavaScript code after logging in, leading to potential security risks.

Understanding CVE-2021-22849

This section provides detailed insights into the impact, technical details, and mitigation strategies related to the CVE-2021-22849 vulnerability.

What is CVE-2021-22849?

CVE-2021-22849, also known as Hyweb HyCMS-J1 - Stored XSS, allows users to execute stored XSS attacks by injecting JavaScript code through the backend editing function of Hyweb HyCMS-J1 versions less than or equal to 7.4.3.

The Impact of CVE-2021-22849

The vulnerability poses a medium risk with a CVSS base score of 4.6. It requires low privileges and user interaction to exploit, potentially compromising confidentiality and integrity of the affected systems.

Technical Details of CVE-2021-22849

Let's delve deeper into the vulnerability details to understand the affected systems, exploitation mechanism, and possible solutions.

Vulnerability Description

Hyweb HyCMS-J1 allows users to bypass special character filtering, enabling the injection of JavaScript code to initiate a stored XSS attack, impacting system security.

Affected Systems and Versions

Hyweb HyCMS-J1 versions up to and including 7.4.3 are susceptible to this stored XSS vulnerability, exposing them to exploitation by malicious actors.

Exploitation Mechanism

By leveraging the lack of input validation in the backend editing function, attackers can insert JavaScript payloads, leading to the execution of arbitrary code within the context of the affected application.

Mitigation and Prevention

To safeguard systems from CVE-2021-22849, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Users are advised to update Hyweb HyCMS-J1 to the latest version promptly. Alternatively, contacting Hyweb Tech for vulnerability remediation can help mitigate the risk.

Long-Term Security Practices

Implement strict input validation measures, security testing procedures, and stay informed about vendor security updates to prevent XSS vulnerabilities in the future.

Patching and Updates

Regularly monitor for security advisories and apply patches released by the vendor to address known vulnerabilities and enhance system security.