CVE-2021-29438 : Security Advisory and Response
Learn about CVE-2021-29438, a XSS vulnerability in Nextcloud dialogs library (@nextcloud/dialogs) before 3.1.2. Understand the impact, affected systems, and mitigation steps.
Nextcloud dialogs library (@nextcloud/dialogs) before version 3.1.2 is vulnerable to XSS due to insufficiently escaped text input in toasts.
Understanding CVE-2021-29438
This CVE identifies a vulnerability in Nextcloud dialogs library that could lead to XSS attacks if user-supplied input is displayed in toasts.
What is CVE-2021-29438?
The CVE-2021-29438 refers to an XSS vulnerability in the Nextcloud dialogs library (@nextcloud/dialogs) before version 3.1.2. The issue arises from insufficiently escaping text input in toasts, which could be exploited for XSS attacks.
The Impact of CVE-2021-29438
The impact of this vulnerability is rated as MEDIUM with a CVSS base score of 4.6. It requires user interaction and has low confidentiality and integrity impacts. However, it could potentially lead to XSS attacks.
Technical Details of CVE-2021-29438
This section covers the technical aspects of the vulnerability.
Vulnerability Description
The vulnerability arises from insufficiently escaped text input in toasts in the Nextcloud dialogs library (@nextcloud/dialogs) before version 3.1.2, leading to a potential XSS threat.
Affected Systems and Versions
The affected system is any application using the Nextcloud dialogs library (@nextcloud/dialogs) before version 3.1.2.
Exploitation Mechanism
Attackers could exploit this vulnerability by providing malicious input to be displayed in toasts, allowing for XSS attacks.
Mitigation and Prevention
To address CVE-2021-29438, follow these security measures.
Immediate Steps to Take
Upgrade to version 3.1.2 of the Nextcloud dialogs library to mitigate the XSS vulnerability. Avoid displaying user-supplied input in toasts without proper escaping mechanisms.
Long-Term Security Practices
Implement input validation and output encoding practices in your applications to prevent XSS attacks. Regularly update dependencies to patched versions to mitigate known vulnerabilities.
Patching and Updates
Stay informed about security advisories related to the Nextcloud dialogs library and promptly apply patches to secure your applications.