CVE-2020-28954 : Exploit Details and Defense Strategies
Learn about CVE-2020-28954, a vulnerability in BigBlueButton before 2.2.29 allowing control characters in user names. Find out the impact, affected systems, and mitigation steps.
BigBlueButton before 2.2.29 in web/controllers/ApiController.groovy lacks parameter sanitization, allowing control characters in a user name.
Understanding CVE-2020-28954
This CVE involves a vulnerability in BigBlueButton that could be exploited due to inadequate parameter sanitization.
What is CVE-2020-28954?
The vulnerability in web/controllers/ApiController.groovy in BigBlueButton before version 2.2.29 allows the acceptance of control characters in a user name, which can lead to potential security risks.
The Impact of CVE-2020-28954
The presence of this vulnerability could enable malicious actors to manipulate user names with control characters, potentially leading to unauthorized access or other security breaches.
Technical Details of CVE-2020-28954
This section provides more technical insights into the CVE.
Vulnerability Description
The vulnerability arises from the lack of proper parameter sanitization in the ApiController.groovy file, allowing the acceptance of control characters in user names.
Affected Systems and Versions
- Affected Systems: BigBlueButton before version 2.2.29
- Affected Versions: All versions prior to 2.2.29
Exploitation Mechanism
Malicious actors can exploit this vulnerability by crafting user names with control characters, potentially bypassing security measures and gaining unauthorized access.
Mitigation and Prevention
To address and prevent the exploitation of CVE-2020-28954, consider the following steps:
Immediate Steps to Take
- Update BigBlueButton to version 2.2.29 or later to mitigate the vulnerability.
- Monitor user inputs for suspicious characters or patterns to prevent potential exploits.
Long-Term Security Practices
- Implement strict input validation mechanisms to sanitize user inputs effectively.
- Regularly audit and review code for vulnerabilities, especially in user input handling.
Patching and Updates
- Apply patches and updates provided by BigBlueButton promptly to address security vulnerabilities and enhance system security.