CVE-2012-4878 in FlatnuX
Summary
by MITRE
Absolute path traversal vulnerability in controlcenter.php in FlatnuX CMS 2011 08.09.2 allows remote administrators to read arbitrary files via a full pathname in the dir parameter in a contents/Files action.
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Analysis
by VulDB Data Team • 01/11/2025
The CVE-2012-4878 vulnerability represents a critical absolute path traversal flaw in the FlatnuX CMS version 2011 08.09.2, specifically within the controlcenter.php script. This vulnerability classifies under CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw exists in the handling of user-supplied input in the dir parameter during a contents/Files action, allowing malicious actors to manipulate file access requests. The vulnerability is particularly dangerous because it targets the administrative interface of the CMS, meaning that an attacker who has already gained administrative access could exploit this weakness to escalate their privileges further or access sensitive system files. The attack vector requires the attacker to have administrative credentials, but the vulnerability allows them to bypass normal access controls and read arbitrary files on the server filesystem. This represents a significant security risk as it could potentially expose configuration files, database credentials, user information, and other sensitive data that should remain protected within the application's restricted directory structure.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the controlcenter.php file. When processing the dir parameter, the application fails to properly validate or sanitize the user-supplied absolute path, allowing attackers to inject malicious path sequences that can traverse the filesystem. The flaw demonstrates a classic example of insufficient input sanitization where the application directly incorporates user input into file system operations without proper boundary checks or normalization. This weakness enables attackers to craft malicious requests that can access files outside the intended directory scope, potentially leading to complete system compromise. The vulnerability operates at the application layer, specifically targeting the file system access controls implemented by the CMS, and can be exploited through standard web application attack techniques. The attack requires only a single parameter manipulation within the existing administrative interface, making it relatively straightforward to execute once an attacker has administrative credentials.
The operational impact of CVE-2012-4878 extends beyond simple file disclosure, as it creates potential pathways for more sophisticated attacks within the compromised system. An attacker with administrative access could leverage this vulnerability to read sensitive configuration files that might contain database connection strings, cryptographic keys, or other critical system information. The ability to traverse absolute paths could also enable access to application source code, potentially revealing additional vulnerabilities or exposing implementation details that could be used in further attacks. This vulnerability significantly weakens the security posture of FlatnuX CMS installations, as it allows for privilege escalation within the administrative context. The impact is particularly severe because it operates within the control center, which typically has elevated privileges and access to the entire system. Organizations running this version of FlatnuX CMS face potential data breaches, system compromise, and compliance violations if this vulnerability is exploited. The vulnerability also affects the principle of least privilege, as it allows administrative users to access files that should be restricted to system administrators only.
Mitigation strategies for CVE-2012-4878 should focus on input validation, access control reinforcement, and system hardening measures. The primary remediation involves implementing proper input sanitization and validation for all user-supplied parameters, particularly those used in file system operations. Organizations should ensure that the dir parameter is strictly validated to prevent absolute path injection attacks, implementing path normalization and whitelisting approaches to restrict file access to intended directories. The solution should include implementing proper access controls that enforce the principle of least privilege, ensuring that administrative functions cannot access arbitrary files on the system. System administrators should also implement proper logging and monitoring to detect suspicious file access patterns that might indicate exploitation attempts. Additionally, upgrading to a patched version of FlatnuX CMS is essential, as this vulnerability was likely addressed in subsequent releases. The mitigation approach should also include network segmentation and firewall rules to limit access to administrative interfaces, reducing the attack surface for potential exploitation attempts. Organizations should conduct regular security assessments and penetration testing to identify similar vulnerabilities in their web applications, particularly those related to file system access controls and input validation weaknesses. This vulnerability serves as a reminder of the importance of implementing proper security controls at every layer of application development, including input validation, access control enforcement, and secure coding practices.