CVE-2021-42335 : What You Need to Know
Learn about CVE-2021-42335 where remote attackers can exploit Easytest's bulletin board management to conduct a stored XSS attack. Take immediate action by updating to version 2100.
Easytest bulletin board management function of online learning platform allows for remote attackers to execute a stored XSS attack by injecting JavaScript after obtaining a user's privilege.
Understanding CVE-2021-42335
This CVE involves a stored XSS vulnerability in Huachu Digital Technology Co.,Ltd.'s Easytest online learning platform.
What is CVE-2021-42335?
The bulletin board management function of Easytest does not properly filter special characters, enabling attackers to inject malicious JavaScript and conduct a stored XSS attack.
The Impact of CVE-2021-42335
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: Low
- User Interaction: Required
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
- Base Score: 5.4 (Medium)
- Scope: Changed
Technical Details of CVE-2021-42335
This section provides more in-depth technical details of the vulnerability.
Vulnerability Description
The issue arises from the absence of special character filtering in the Easytest bulletin board management function, allowing unauthorized JavaScript injection for stored XSS attacks.
Affected Systems and Versions
- Product: Easytest
- Vendor: Huachu Digital Technology Co.,Ltd.
- Version Affected: 1705
Exploitation Mechanism
Attackers exploit the lack of input validation to inject malicious JavaScript code into the bulletin board management function, manipulating user privileges to perform stored XSS attacks.
Mitigation and Prevention
It is crucial to take immediate action to mitigate the risks posed by this vulnerability.
Immediate Steps to Take
- Update Easytest to version 2100 to patch the vulnerability.
Long-Term Security Practices
- Enforce secure coding practices to prevent XSS vulnerabilities.
- Regularly monitor and audit user input and output to detect and prevent malicious injections.
- Educate users on the importance of safe browsing habits and report suspicious activities.
Patching and Updates
Stay proactive in applying software updates and security patches to prevent potential vulnerabilities.