CVE-2022-35239 in SolarView Compact SV-CPT-MC310
Summary
by MITRE • 08/16/2022
The image file management page of SolarView Compact SV-CPT-MC310 Ver.7.23 and earlier, and SV-CPT-MC310F Ver.7.23 and earlier contains an insufficient verification vulnerability when uploading files. If this vulnerability is exploited, arbitrary PHP code may be executed if a remote authenticated attacker uploads a specially crafted PHP file.
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Analysis
by VulDB Data Team • 08/16/2022
The vulnerability identified as CVE-2022-35239 affects the image file management functionality within SolarView Compact SV-CPT-MC310 and SV-CPT-MC310F devices running firmware versions 7.23 and earlier. This represents a critical security flaw that undermines the integrity of the device's file upload mechanisms and exposes the system to remote code execution attacks. The affected component specifically handles image file uploads through a web-based management interface, creating an attack surface where malicious actors can manipulate the system's file handling processes. The vulnerability stems from inadequate input validation and file type verification procedures that fail to properly sanitize or restrict uploaded file content, allowing attackers to bypass security controls designed to prevent execution of malicious code.
This security weakness manifests as a lack of proper file extension validation and content type checking within the device's web interface. When authenticated users upload image files through the management page, the system does not adequately verify that uploaded files conform to expected image formats or contain malicious code disguised as legitimate media files. The vulnerability enables attackers to upload PHP scripts that can be executed by the web server, potentially allowing full system compromise. According to CWE classification, this vulnerability maps to CWE-434 which describes "Unrestricted Upload of File with Dangerous Type," a well-documented weakness that has been exploited in numerous security incidents. The flaw represents a direct violation of secure coding principles that require proper input validation and file handling procedures to prevent arbitrary code execution.
The operational impact of this vulnerability extends beyond simple unauthorized code execution, as it provides attackers with persistent access to the device's underlying system resources. Once exploited, attackers can potentially escalate privileges, modify device configurations, access sensitive data, or use the compromised device as a staging point for further attacks within the network. The vulnerability affects both the SV-CPT-MC310 and SV-CPT-MC310F models, indicating a widespread issue across similar device variants that share the same firmware architecture. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1505.003 which covers "Server Software Component: Web Shell" and T1059.007 which addresses "Command and Scripting Interpreter: PHP." The authenticated nature of the attack means that attackers must first gain valid credentials, but once achieved, they can leverage this vulnerability to achieve persistent system compromise without requiring additional privileges.
Organizations using these devices should implement immediate mitigations including firmware updates to versions that address the file upload validation issues, network segmentation to limit access to management interfaces, and enhanced monitoring of file upload activities. The vulnerability demonstrates the critical importance of input validation and secure file handling practices in embedded systems, particularly those with web-based management interfaces. Security teams should also consider implementing web application firewalls to detect and block suspicious file upload attempts, as well as regular security assessments to identify similar vulnerabilities in other networked devices. The incident highlights the necessity of following security best practices such as the principle of least privilege, proper file type validation, and secure coding standards that prevent dangerous file types from being executed within web applications.