CVE-2008-0840 in LightBlog
Summary
by MITRE
Directory traversal vulnerability in view_member.php in Public Warehouse LightBlog 9.6 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the username parameter.
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Analysis
by VulDB Data Team • 10/17/2024
The vulnerability described in CVE-2008-0840 represents a classic directory traversal flaw that affects the Public Warehouse LightBlog 9.6 content management system. This issue stems from inadequate input validation within the view_member.php script which fails to properly sanitize user-supplied data before using it in file inclusion operations. The vulnerability specifically manifests when the username parameter contains directory traversal sequences such as .. (dot dot) characters that allow attackers to navigate outside the intended directory structure and access arbitrary local files on the server filesystem.
This directory traversal vulnerability 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. The flaw enables attackers to manipulate the application's file handling mechanisms by injecting malicious path sequences that bypass normal access controls. In the context of LightBlog 9.6, the vulnerability occurs because the application does not adequately validate or sanitize the username parameter before using it in file operations that determine which member profile to display.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass full system compromise potential. An attacker can leverage this weakness to access sensitive files including configuration files, database credentials, application source code, and potentially system files that should remain protected from unauthorized access. The ability to execute arbitrary local files through this vulnerability creates a pathway for remote code execution, allowing attackers to gain control over the affected server and potentially use it as a launching point for further attacks within the network infrastructure. This vulnerability directly maps to several techniques documented in the MITRE ATT&CK framework under the T1059.007 and T1566 attack patterns, specifically targeting remote code execution and privilege escalation through application vulnerabilities.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the application code. The most effective approach involves implementing strict parameter validation that rejects any input containing directory traversal sequences or special characters that could manipulate file paths. Additionally, the application should employ secure coding practices such as using allowlists of valid usernames and implementing proper file access controls that restrict file operations to predefined directories. Organizations should also consider implementing web application firewalls that can detect and block suspicious path traversal attempts, and regularly update their applications to address known vulnerabilities. The vulnerability demonstrates the critical importance of input validation in preventing path traversal attacks and aligns with security best practices outlined in OWASP Top Ten and NIST cybersecurity guidelines for secure software development.