CVE-2009-2116 in SkyBlueCanvas
Summary
by MITRE
Directory traversal vulnerability in admin.php in SkyBlueCanvas 1.1 r237 allows remote authenticated administrators to list directory contents via a .. (dot dot) in the dir parameter.
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Analysis
by VulDB Data Team • 08/21/2025
The CVE-2009-2116 vulnerability represents a critical directory traversal flaw within the SkyBlueCanvas content management system version 1.1 r237. This vulnerability specifically affects the admin.php administrative component and operates through a simple yet dangerous parameter manipulation technique. The flaw allows authenticated administrators to exploit a weakness in input validation by injecting .. (dot dot) sequences into the dir parameter, thereby enabling unauthorized directory listing operations. This issue fundamentally undermines the security boundaries of the administrative interface and creates potential pathways for information disclosure and further exploitation.
The technical implementation of this vulnerability stems from inadequate input sanitization within the administrative file handling mechanism. When the admin.php script processes directory listing requests, it fails to properly validate or sanitize the dir parameter, allowing maliciously crafted input containing directory traversal sequences to bypass normal access controls. The vulnerability manifests as a classic path traversal attack where the .. sequence is used to navigate up directory levels, effectively allowing an authenticated administrator to access directories outside the intended administrative scope. This weakness directly maps to CWE-22, which categorizes directory traversal vulnerabilities as a fundamental flaw in input validation and access control mechanisms.
From an operational impact perspective, this vulnerability significantly elevates the risk profile for systems running SkyBlueCanvas 1.1 r237. While the attack requires authentication, the privilege escalation potential is substantial as it allows an attacker with administrative credentials to enumerate system directories and potentially discover sensitive files, configuration data, or other system artifacts that should remain protected. The vulnerability can be exploited through standard web application attack vectors and aligns with ATT&CK technique T1083, which covers directory listing and file enumeration activities. This capability enables attackers to gather intelligence about the underlying system structure and identify potential additional attack vectors or sensitive information that could be leveraged for further compromise.
The mitigation strategy for CVE-2009-2116 requires immediate implementation of proper input validation and sanitization within the admin.php component. System administrators should ensure that all user-supplied input parameters undergo strict validation to prevent directory traversal sequences from being processed. The fix should implement a whitelist approach for directory access, where only explicitly permitted paths are allowed, rather than relying on blacklisting techniques that can be bypassed. Additionally, the administrative interface should be configured with proper access controls that enforce the principle of least privilege, ensuring that even authenticated administrators cannot access directories outside their designated scope. Organizations should also consider implementing web application firewalls and input validation rules that can detect and block suspicious directory traversal attempts. Regular security audits and vulnerability assessments should be conducted to identify similar weaknesses in other components of the system architecture. This vulnerability highlights the critical importance of proper input validation and access control implementation in web applications, as even authenticated users with administrative privileges can cause significant damage when input validation is inadequate.