CVE-2021-31863 : Security Advisory and Response
Learn about CVE-2021-31863, a security flaw in Redmine versions before 4.2.1 allowing unauthorized access to local files. Find out the impact, affected systems, and mitigation steps.
A security vulnerability in Redmine versions before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows users to read arbitrary local files. Here's what you need to know about CVE-2021-31863.
Understanding CVE-2021-31863
This CVE relates to insufficient input validation in the Git repository integration of Redmine, leading to unauthorized access to local files.
What is CVE-2021-31863?
The vulnerability in Redmine enables users to access arbitrary local files that are reachable by the application server process.
The Impact of CVE-2021-31863
Exploiting this vulnerability can allow malicious actors to retrieve sensitive information stored in the application server, potentially leading to unauthorized data access.
Technical Details of CVE-2021-31863
This section provides detailed insights into the vulnerability affecting Redmine.
Vulnerability Description
The issue stems from inadequate input validation in the Git repository integration of Redmine versions prior to 4.2.1, enabling unauthorized file access.
Affected Systems and Versions
Redmine versions before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 are impacted by this vulnerability, putting users of these versions at risk.
Exploitation Mechanism
By taking advantage of the insufficient input validation, threat actors can exploit this vulnerability to gain access to sensitive local files accessible by the application server process.
Mitigation and Prevention
Understanding how to mitigate and prevent CVE-2021-31863 is crucial for enhancing the security posture of Redmine instances.
Immediate Steps to Take
Users should update their Redmine installations to versions 4.0.9, 4.1.3, or 4.2.1 to eliminate the vulnerability and protect their systems from potential exploitation.
Long-Term Security Practices
Implementing robust input validation processes and regular security audits can help prevent similar vulnerabilities from arising in the future.
Patching and Updates
Regularly applying security patches and staying up to date with Redmine's security advisories is essential to ensure the protection of your system.