CVE-2011-3837 in Wuzly
Summary
by MITRE
Directory traversal vulnerability in blog_system/data_functions.php in Wuzly 2.0 allows remote attackers to read arbitrary files via a .. (dot dot) in the preview parameter to index.php.
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Analysis
by VulDB Data Team • 02/13/2019
The directory traversal vulnerability identified as CVE-2011-3837 affects Wuzly 2.0 blog system, specifically within the blog_system/data_functions.php component. This flaw represents a critical security weakness that enables remote attackers to access arbitrary files on the target system through improper input validation mechanisms. The vulnerability manifests when the preview parameter in index.php accepts directory traversal sequences, allowing malicious actors to navigate beyond the intended directory structure and retrieve sensitive files from the server.
This technical flaw falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, also known as path traversal or directory traversal attacks. The vulnerability occurs due to insufficient validation of user-supplied input in the preview parameter, where the application fails to properly sanitize or filter directory traversal sequences such as .. (dot dot). Attackers can exploit this by crafting malicious URLs that include these sequences, effectively bypassing access controls and gaining unauthorized access to files outside the intended web root directory.
The operational impact of this vulnerability is significant and multifaceted. Remote attackers can potentially access sensitive system files, configuration data, database credentials, and other confidential information stored on the server. This includes not only application-specific files but also system-level configurations that could provide attackers with deeper insights into the server environment. The vulnerability enables attackers to perform reconnaissance activities, gather intelligence for further exploitation, and potentially escalate privileges within the compromised system. Additionally, the ability to read arbitrary files could lead to the exposure of source code, which might reveal additional vulnerabilities or business-critical information.
The exploitation of this vulnerability aligns with techniques documented in the MITRE ATT&CK framework under the T1083 - File and Directory Discovery tactic, where adversaries seek to identify files and directories on compromised systems. This vulnerability also supports broader attack patterns including credential theft, system reconnaissance, and potentially privilege escalation. Organizations running Wuzly 2.0 are at risk of data breaches, regulatory compliance violations, and reputational damage if this vulnerability remains unpatched.
Mitigation strategies for CVE-2011-3837 should focus on implementing proper input validation and sanitization mechanisms. The most effective approach involves implementing strict parameter validation that rejects or filters out directory traversal sequences before processing user input. Organizations should also implement proper access controls and employ secure coding practices that prevent path traversal vulnerabilities. The recommended solution includes implementing a whitelist approach for file access, where only predetermined safe file paths are allowed, and all user-supplied input undergoes rigorous sanitization. Additionally, regular security audits and code reviews should be conducted to identify and remediate similar vulnerabilities in other applications. System administrators should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious directory traversal attempts. The patching process for this vulnerability requires updating the Wuzly 2.0 software to a version that properly validates the preview parameter in index.php, ensuring that directory traversal sequences are appropriately handled and rejected.