CVE-2023-34253 : Security Advisory and Response
Learn about CVE-2023-34253 impacting Grav content management system. Discover the vulnerability details, impact, affected systems, and mitigation steps.
This article provides detailed information about CVE-2023-34253, a vulnerability affecting Grav content management system.
Understanding CVE-2023-34253
CVE-2023-34253 is a Server-side Template Injection (SSTI) vulnerability in Grav, allowing attackers to bypass denylist protections.
What is CVE-2023-34253?
Grav, a flat-file content management system, before version 1.7.42, suffered from an incomplete denylist that permitted malicious template injections. An attacker with low privileges could exploit this to execute remote code.
The Impact of CVE-2023-34253
The vulnerability in Grav enables attackers to inject templates, potentially leading to remote code execution, compromising the integrity and confidentiality of the affected systems.
Technical Details of CVE-2023-34253
This section outlines the specifics of the vulnerability.
Vulnerability Description
Grav's denylist was vulnerable to subversion through various methods, allowing injection of malicious templates and subsequent remote code execution by low-privileged attackers.
Affected Systems and Versions
Grav versions prior to 1.7.42 are affected by this vulnerability, impacting systems where this specific version is in use.
Exploitation Mechanism
Attackers with login access to Grav Admin panel and page creation/update permissions could exploit the incomplete denylist to inject malicious templates, executing remote code.
Mitigation and Prevention
To address CVE-2023-34253, immediate actions and long-term security practices are essential.
Immediate Steps to Take
Users should update Grav to version 1.7.42 or later to patch the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implementing secure coding practices, monitoring for suspicious activities, and educating users on best security practices can enhance the overall security posture.
Patching and Updates
Regularly check for software updates and security advisories for Grav to stay informed about the latest patches and security enhancements.