CVE-2021-37794 : Exploit Details and Defense Strategies
Learn about CVE-2021-37794, a stored XSS vulnerability in FileBrowser < v2.16.0 allowing authenticated users to upload malicious .svg files triggering OS commands. Take immediate steps for mitigation.
A stored cross-site scripting (XSS) vulnerability exists in FileBrowser < v2.16.0 that allows an authenticated user to upload a malicious .svg file, which acts as a stored XSS payload triggering malicious OS commands if exploited.
Understanding CVE-2021-37794
This CVE involves a stored XSS vulnerability in FileBrowser versions prior to v2.16.0, enabling authenticated users to upload harmful .svg files.
What is CVE-2021-37794?
The vulnerability in FileBrowser allows an authenticated user to upload a malicious .svg file, acting as a stored XSS payload which can execute malicious commands.
The Impact of CVE-2021-37794
If a user manages to trigger the stored XSS payload by an administrator, it could lead to the execution of malicious OS commands on the server running FileBrowser.
Technical Details of CVE-2021-37794
This section covers the specific technical aspects of the vulnerability.
Vulnerability Description
The vulnerability allows an authenticated user to upload a .svg file containing malicious code, which if accessed by an administrator, can trigger harmful OS commands.
Affected Systems and Versions
FileBrowser versions earlier than v2.16.0 are susceptible to this stored XSS vulnerability.
Exploitation Mechanism
An attacker with authenticated access can upload a malicious .svg file, and if this file is accessed by an administrator, it can trigger harmful OS commands.
Mitigation and Prevention
To safeguard systems from CVE-2021-37794, immediate steps need to be taken along with long-term security practices and regular patching.
Immediate Steps to Take
Administrators should update FileBrowser to version v2.16.0 or newer to mitigate the risk of exploitation.
Long-Term Security Practices
Implement strict file upload validation and input sanitization mechanisms to prevent similar vulnerabilities in the future.
Patching and Updates
Continuous monitoring for security updates and applying patches promptly is essential to ensure system integrity and protection against evolving threats.