Kirby CMS is a flexible, file-based content management system used by web developers and content creators worldwide to build websites and manage content. Its user-friendly interface and versatility make it a popular choice for crafting dynamic web pages and blogs. The software is designed to be intuitive for users with little technical expertise, while still offering powerful customization options for advanced developers. Kirby CMS can be utilized by small businesses, freelancers, and large organizations alike due to its scalability and powerful templates. Websites built on Kirby CMS benefit from a flat-file architecture, eliminating the need for a database and enhancing performance. As an open-source platform, it encourages a community-driven approach, with regular updates and a multitude of plugins for extended functionality.
Path Traversal is a web security vulnerability that allows an attacker to access directories and files that are stored outside the web root folder. By manipulating variables that reference files with "dot-dot-slash (../)" sequences and their variations or by using absolute file paths, attackers can perform this attack. Such vulnerabilities may lead to full access to the file system and the inclusion of unintended files, resulting in unauthorized data retrieval. In the context of Kirby CMS, this vulnerability involves the /api/auth/login endpoint, where an attacker can supply a specially crafted email value to perform directory traversal attacks. Successful exploitation may allow a malicious actor to access or execute files outside the intended directory structure, undermining the application's security.
The path traversal vulnerability in Kirby CMS is found in its 5.3.0 to 5.4.0 versions, specifically within the /api/auth/login endpoint. An attacker can inject traversal sequences such as "../.." into the email field of a login request, which could potentially lead to unauthorized file inclusion or execution. This vulnerability arises because the application fails to properly sanitize user input, allowing it to be concatenated into file system paths. When such input is processed by the server, it may lead to the resolution of paths outside the intended directory, exposing sensitive files like index.php. As a protective measure, starting from version 5.4.1, the application implements proper input validation and sanitation procedures to prevent directory traversal exploits.
Exploiting this path traversal vulnerability can have several detrimental effects on affected systems. Attackers may gain the capability to include or execute arbitrary PHP files, which could compromise server integrity or lead to information disclosure. This could subsequently result in unauthorized access to sensitive data, such as database credentials or configuration settings. Even worse, if leveraged correctly, it could allow threat actors to execute arbitrary code, potentially leading to full server compromise. Moreover, continuous unauthorized access and manipulation might disrupt service delivery or degrade the performance of affected websites, causing reputational and financial damage to organizations relying on the vulnerable CMS versions.
REFERENCES
- Update Kirby CMS to version 5.4.1 or later to address the vulnerability.
- Regularly review and update access controls to files and directories in your server environment.
- Implement stringent input validation and sanitation policies to prevent new entry points for injection attacks.
- Ensure all plugins and extensions used with Kirby CMS are also updated to their latest secure versions.
- Conduct regular security audits to identify and mitigate potential vulnerabilities early.
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