CVE-2007-1549 in phpx
Summary
by MITRE
Unrestricted file upload vulnerability in gallery.php in phpx 3.5.15 allows remote attackers to upload and execute arbitrary PHP scripts via an addImage action, which places scripts into the gallery/shelties/ directory.
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Analysis
by VulDB Data Team • 08/27/2018
The vulnerability identified as CVE-2007-1549 represents a critical unrestricted file upload flaw within the phpx 3.5.15 content management system, specifically affecting the gallery.php component. This vulnerability arises from inadequate input validation and sanitization mechanisms that fail to properly restrict file types accepted during the image upload process. The flaw is particularly dangerous because it allows remote attackers to bypass security controls and execute malicious code directly on the target system, creating a severe pathway for unauthorized access and system compromise.
The technical implementation of this vulnerability occurs through the addImage action functionality within gallery.php, which processes user-uploaded files without sufficient validation of file extensions, content types, or file attributes. When legitimate users attempt to add images to the gallery system, the application fails to verify whether uploaded files conform to expected image formats or contain malicious code embedded within seemingly benign file extensions. The vulnerability specifically targets the gallery/shelties/ directory where uploaded files are stored, making this location a prime target for attackers seeking persistent access to the system.
The operational impact of CVE-2007-1549 extends far beyond simple unauthorized file uploads, as it provides attackers with the capability to execute arbitrary PHP scripts on the vulnerable server. This execution capability enables attackers to perform a wide range of malicious activities including but not limited to data exfiltration, system reconnaissance, privilege escalation, and establishment of persistent backdoors. The vulnerability directly maps to CWE-434 Unrestricted Upload of File with Dangerous Type, which is classified as a high-risk weakness in the Common Weakness Enumeration catalog. This weakness is particularly concerning because it can be exploited through the attacker's ability to upload and execute code remotely, potentially leading to complete system compromise.
From an adversarial perspective, this vulnerability aligns with multiple tactics described in the MITRE ATT&CK framework, particularly focusing on initial access and execution phases. Attackers can leverage this vulnerability to establish a foothold through the upload of web shells or other malicious payloads, subsequently using these tools to maintain persistent access and escalate privileges within the compromised environment. The vulnerability's exploitation requires minimal technical expertise, making it attractive to attackers across different skill levels and increasing the overall threat surface for affected systems.
Mitigation strategies for CVE-2007-1549 should focus on implementing comprehensive file validation mechanisms that enforce strict file type restrictions and content verification. Organizations must ensure that all file upload functionalities include proper input sanitization, MIME type checking, and file extension validation to prevent the execution of malicious code. Additionally, the gallery/shelties/ directory should be configured with appropriate access controls and permissions to prevent direct execution of uploaded files. The most effective remediation involves implementing a multi-layered approach including web application firewalls, regular security updates, and comprehensive code review processes to identify and address similar vulnerabilities in other components of the system.