CVE-2021-43795 : What You Need to Know
Learn about CVE-2021-43795, a high-severity vulnerability in Armeria microservice framework allowing path traversal attacks. Explore impact, affected versions, and mitigation steps.
Armeria is an open-source microservice framework with a vulnerability that allows an attacker to access the server's local file system beyond its restricted directory through an HTTP request.
Understanding CVE-2021-43795
What is CVE-2021-43795?
In versions of Armeria below 1.13.4, an attacker can bypass path validation logic by sending an HTTP request with an encoded path, potentially leading to unauthorized access to local files.
The Impact of CVE-2021-43795
The vulnerability has a CVSS base score of 7.5 (High) with high confidentiality impact. Attackers can exploit this issue without requiring privileges, impacting the integrity of affected systems.
Technical Details of CVE-2021-43795
Vulnerability Description
Armeria's vulnerability stems from improper handling of encoded paths, enabling path traversal attacks that can compromise system security.
Affected Systems and Versions
- Product: Armeria
- Vendor: Line
- Versions Affected: < 1.13.4
Exploitation Mechanism
Attackers exploit the vulnerability by encoding paths in HTTP requests, bypassing path validation, and gaining unauthorized access to sensitive files.
Mitigation and Prevention
Immediate Steps to Take
- Upgrade Armeria to version 1.13.4 or above to mitigate the vulnerability.
- Implement additional path validation logic as a workaround.
Long-Term Security Practices
- Regularly monitor and update security patches for Armeria.
- Conduct security assessments to identify and address similar path traversal vulnerabilities.
Patching and Updates
Ensure timely installation of security patches provided by Armeria to address vulnerabilities and maintain system security.