CVE-2008-1409 in Exero CMS
Summary
by MITRE
Multiple directory traversal vulnerabilities in the Default theme in Exero CMS 1.0.1 allow remote attackers to include and execute arbitrary local files via directory traversal sequences in the theme parameter to (1) index.php, (2) editpassword.php, and (3) avatar.php in usercp/; (4) custompage.php; (5) errors/404.php; (6) memberslist.php and (7) profile.php in members/; (8) index.php and (9) fullview.php in news/; and (10) nopermission.php.
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Analysis
by VulDB Data Team • 10/19/2024
The CVE-2008-1409 vulnerability represents a critical directory traversal flaw affecting Exero CMS 1.0.1, specifically targeting the Default theme implementation across multiple script files. This vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly restrict user-supplied data from being processed as file paths. The flaw allows remote attackers to manipulate the theme parameter through carefully crafted directory traversal sequences, enabling unauthorized access to local files on the server. The vulnerability affects a wide range of endpoints including user control panel scripts, member directory pages, news modules, and error handling files, demonstrating the extensive scope of the affected application components.
The technical exploitation of this vulnerability follows the classic directory traversal pattern where attackers can manipulate file path resolution by injecting sequences such as ../ or ..\ into the theme parameter. When the application processes these inputs without proper validation, it can be tricked into accessing files outside of the intended directory structure, potentially leading to arbitrary code execution or sensitive data disclosure. The vulnerability operates at the application layer and can be classified under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. This type of vulnerability allows attackers to bypass normal access controls and potentially gain access to system files, configuration data, or other sensitive resources that should remain protected.
The operational impact of CVE-2008-1409 extends beyond simple file access, as it can enable attackers to execute arbitrary local files on the target system, potentially leading to complete system compromise. Attackers can leverage this vulnerability to read configuration files containing database credentials, application secrets, or other sensitive information. The widespread nature of the affected files means that exploitation could occur across multiple attack vectors, from user account management functions to core application modules. This vulnerability directly relates to ATT&CK technique T1566.001, which involves the exploitation of vulnerabilities in remote services to gain initial access to target systems. The attack surface includes not only the immediate file inclusion capabilities but also the potential for privilege escalation through access to system-level configuration files.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and sanitization across all user-supplied parameters. The application should enforce strict path validation that prevents directory traversal sequences from being processed as legitimate file paths, implementing whitelisting mechanisms for theme selection rather than allowing arbitrary input. Organizations should apply the vendor-provided security patches or upgrade to a supported version of Exero CMS that addresses this vulnerability. Additional protective measures include implementing proper file access controls, restricting web server permissions to prevent access to sensitive system files, and deploying web application firewalls that can detect and block suspicious directory traversal patterns. Security monitoring should be enhanced to detect unusual file access patterns that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of input validation in web applications and aligns with security best practices outlined in OWASP Top Ten, specifically addressing the risk of path traversal vulnerabilities that can lead to complete system compromise.