CVE-2007-3932 in Expose
Summary
by MITRE
uploadimg.php in the Expose RC35 and earlier (com_expose) component for Joomla! sends an error message but does not exit when it detects an attempt to upload a non-JPEG file, which allows remote attackers to upload and execute arbitrary PHP code in the img/ folder.
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Analysis
by VulDB Data Team • 09/26/2024
The vulnerability identified as CVE-2007-3932 resides within the Expose component version 35 and earlier for Joomla! platforms, specifically targeting the uploadimg.php script. This security flaw represents a critical directory traversal and code execution vulnerability that stems from inadequate input validation and improper error handling mechanisms. The component's image upload functionality fails to properly validate file types, creating a pathway for malicious actors to bypass security restrictions and upload potentially harmful files to the web server.
The technical implementation of this vulnerability manifests through a flawed validation process in the uploadimg.php script where the system sends an error message to indicate file type rejection but continues executing the script without proper termination. This design flaw creates a condition where attackers can upload PHP files with non-JPEG extensions, as the system does not properly enforce file type restrictions. The vulnerability operates under CWE-20, which classifies it as an improper input validation issue, specifically related to insufficient validation of file types during upload processes. The lack of proper exit conditions after error detection allows the script to proceed with file processing, effectively enabling arbitrary code execution.
From an operational perspective, this vulnerability provides remote attackers with the capability to execute arbitrary PHP code within the img/ directory of the affected Joomla installations. This vulnerability aligns with ATT&CK technique T1190, which describes exploitation of vulnerabilities in web applications, and T1059, which covers execution of malicious code through web shells or uploaded scripts.
The impact of this vulnerability extends to the broader Joomla versions face significant risk of complete system compromise, data exfiltration, and potential use as a launching point for further attacks within their network infrastructure. The vulnerability also highlights the need for regular security assessments and component updates, as it represents a classic example of how inadequate security controls in web application components can lead to catastrophic consequences.
Mitigation strategies for CVE-2007-3932 require immediate action including upgrading to the latest version of the Expose component or applying the vendor-supplied patch. Organizations should implement strict file type validation mechanisms that enforce MIME type checking and filename extension validation. Network administrators should consider implementing web application firewalls to detect and block suspicious upload attempts. The implementation of proper access controls and directory permissions can limit the impact of successful exploitation attempts. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the Joomla! platform. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software components and implementing defense-in-depth strategies to protect against such exploitation techniques.