CVE-2021-32782 : Vulnerability Insights and Analysis
Learn about CVE-2021-32782, a Cross-Site Scripting vulnerability in Nextcloud Circles. Upgrade to secure versions 0.21.3, 0.20.10, or 0.19.14 to prevent attacks. Explore impact, technical details, and mitigation steps.
Nextcloud Circles, an open-source social network within the Nextcloud ecosystem, is impacted by a stored Cross-Site Scripting (XSS) vulnerability. Upgrade to versions 0.21.3, 0.20.10, or 0.19.14 to mitigate the issue. Learn more about the impact, technical details, and mitigation steps below.
Understanding CVE-2021-32782
In affected versions, Nextcloud Circles is susceptible to a stored Cross-Site Scripting (XSS) vulnerability due to a strict Content-Security-Policy.
What is CVE-2021-32782?
The CVE-2021-32782 vulnerability involves a stored Cross-Site Scripting (XSS) flaw in the Nextcloud Circles application, making it vulnerable to attacks that could compromise user data.
The Impact of CVE-2021-32782
With a CVSS base score of 5.8 (Medium severity), this vulnerability could result in a confidentiality impact of High, requiring low privileges to exploit. However, browsers with Content-Security-Policy (CSP) support may not be affected.
Technical Details of CVE-2021-32782
The vulnerability description, affected systems, and exploitation mechanism are detailed as follows:
Vulnerability Description
The flaw arises from improper neutralization of input during web page generation, allowing malicious actors to inject and execute scripts in the context of a user's browser.
Affected Systems and Versions
Nextcloud Circles versions < 0.19.1, >= 0.20.0 and < 0.20.10, >= 0.21.0 and < 0.21.3 are impacted by this XSS vulnerability.
Exploitation Mechanism
Attack complexity is rated as HIGH, leveraging the network attack vector. Privileges required for exploitation are low, but user interaction is necessary, influencing the scope of impact.
Mitigation and Prevention
Protect your Nextcloud Circles installation with the following measures:
Immediate Steps to Take
Upgrade the Nextcloud Circles application to versions 0.21.3, 0.20.10, or 0.19.14 to address the XSS vulnerability. Alternatively, users can utilize browsers that fully support Content-Security-Policy (CSP).
Long-Term Security Practices
Incorporate secure coding practices, regularly update browsers, and educate users on best practices to prevent XSS attacks.
Patching and Updates
Stay informed about security advisories and quickly apply patches released by Nextcloud to safeguard your systems against known vulnerabilities.