CVE-2020-12113 : Security Advisory and Response
Learn about CVE-2020-12113, a vulnerability in BigBlueButton before 2.2.4 allowing XSS attacks via closed captions. Find mitigation steps and preventive measures here.
BigBlueButton before 2.2.4 is vulnerable to XSS via closed captions due to the use of dangerouslySetInnerHTML in React.
Understanding CVE-2020-12113
BigBlueButton before version 2.2.4 is susceptible to a cross-site scripting (XSS) vulnerability through closed captions, leveraging the dangerouslySetInnerHTML function in React.
What is CVE-2020-12113?
This CVE identifies a security issue in BigBlueButton that allows attackers to execute malicious scripts through closed captions, potentially leading to unauthorized access or data theft.
The Impact of CVE-2020-12113
The exploitation of this vulnerability could result in unauthorized script execution, compromising the confidentiality and integrity of user data within the BigBlueButton platform.
Technical Details of CVE-2020-12113
Vulnerability Description
The vulnerability in BigBlueButton before 2.2.4 arises from the insecure use of dangerouslySetInnerHTML in React, enabling attackers to inject and execute arbitrary scripts through closed captions.
Affected Systems and Versions
- Product: BigBlueButton
- Vendor: Not applicable
- Versions affected: All versions before 2.2.4
Exploitation Mechanism
Attackers can exploit this vulnerability by crafting malicious closed captions containing script code, which, when rendered by the application, execute within the context of the user's session, potentially leading to unauthorized actions.
Mitigation and Prevention
Immediate Steps to Take
- Upgrade BigBlueButton to version 2.2.4 or later to mitigate the XSS vulnerability.
- Avoid displaying user-generated content, such as closed captions, without proper sanitization and validation.
Long-Term Security Practices
- Implement input validation and output encoding to prevent XSS attacks in web applications.
- Regularly monitor and audit user-generated content for malicious scripts or code.
Patching and Updates
Ensure timely installation of security patches and updates provided by BigBlueButton to address known vulnerabilities and enhance the platform's security.