Concrete CMS is a widely utilized content management system used by organizations and individuals to create and manage web content. It provides users with the ability to customize website design and functionality using themes and plugins. Known for its user-friendly interface, Concrete CMS is often employed by those with limited technical expertise. Companies and developers frequently use this platform to build websites due to its modular capability and open-source nature, allowing for extensive customization. Typically, it is deployed in environments where robust content management and ease of use are prime considerations. Its primary purpose is to help users create robust websites quickly and efficiently, maintaining a balance of functionality and simplicity.
The Information Disclosure vulnerability in Concrete CMS allows unauthorized access to sensitive site structure data. This flaw exists due to an IDOR and insufficient authentication mechanisms. The vulnerability allows an attacker to access internal site data by manipulating a specific endpoint without proper authorization. This access exposes information like page IDs, versions, and URL paths which could be leveraged for further attacks. Information Disclosure falls under medium-risk vulnerabilities but can lead to significant issues if exploited. This vulnerability highlights the need for adequate authentication checks and input validation in web applications.
In the Concrete CMS version 9.5.0 and below, the endpoint "/ccm/system/dialogs/file/usage/{fID}" does not properly authenticate users. This endpoint allows an attacker to provide an fID integer and view internal site metadata. The vulnerable endpoint accepts GET requests and, upon exploitation, returns sensitive data, including details about the internal structure of a website. The vulnerability primarily exists due to a lack of authentication checks in the affected endpoint. Appropriate measures such as proper authentication can mitigate such vulnerabilities. This technical breakdown underscores the importance of thorough security auditing and testing in development cycles.
Exploiting this vulnerability can lead to unauthorized information disclosure, including critical site structure data. Malicious users could use the accessed data to map out the internal network of the CMS and potentially launch further targeted attacks. This vulnerability could provide attackers with insights into page versions, URL paths, and structure, which could be exploited for more invasive hacks. Data derived from this vulnerability could also assist in crafting socially engineered attacks that appear more credible. In addition to reputational damage, unauthorized data exposure can lead potentially to regulatory penalties where privacy laws are breached.
REFERENCES
- Update to a version later than 9.5.0 or the latest available version.
- Implement proper authentication checks on all endpoints to prevent unauthorized access.
- Conduct regular security audits to identify and remedy vulnerabilities promptly.
- Restrict access to sensitive endpoints and monitor for unusual activities.
- Employ web application firewalls to detect and block unauthorized requests.
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