CVE-2021-3906 Explained : Impact and Mitigation
Learn about CVE-2021-3906, a vulnerability in bookstackapp/bookstack allowing unrestricted upload of files with dangerous types. Understand the impacts and mitigation steps.
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type.
Understanding CVE-2021-3906
This vulnerability affects bookstackapp/bookstack, specifically versions less than 21.10.1, allowing unrestricted upload of files with dangerous types.
What is CVE-2021-3906?
CVE-2021-3906 is a vulnerability in bookstackapp/bookstack that enables attackers to upload files with dangerous types without proper validation.
The Impact of CVE-2021-3906
The vulnerability has a CVSS base score of 5.4, with a medium severity rating. It could lead to low confidentiality and integrity impact.
Technical Details of CVE-2021-3906
This section provides more in-depth technical details regarding the vulnerability.
Vulnerability Description
The issue allows an attacker to upload files with dangerous types, potentially leading to various security risks.
Affected Systems and Versions
bookstackapp/bookstack versions less than 21.10.1 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by uploading malicious files with dangerous types to the affected systems.
Mitigation and Prevention
To address CVE-2021-3906, immediate actions and long-term security practices are recommended.
Immediate Steps to Take
Users should update bookstackapp/bookstack to version 21.10.1 or higher and restrict file upload permissions to only trusted sources.
Long-Term Security Practices
Implement regular security assessments, educate users on safe file uploading practices, and monitor file uploads for suspicious activities.
Patching and Updates
Stay informed about security updates from bookstackapp and apply patches promptly to ensure protection against known vulnerabilities.