CVE-2023-49715 in AVideo
Summary
by MITRE • 01/10/2024
A unrestricted php file upload vulnerability exists in the import.json.php temporary copy functionality of WWBN AVideo dev master commit 15fed957fb. A specially crafted HTTP request can lead to arbitrary code execution when chained with an LFI vulnerability. An attacker can send a series of HTTP requests to trigger this vulnerability.
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Analysis
by VulDB Data Team • 01/28/2024
The vulnerability identified as CVE-2023-49715 represents a critical security flaw within the WWBN AVideo platform's import.json.php component, specifically within its temporary copy functionality. This issue stems from inadequate input validation and file handling mechanisms that permit unrestricted php file uploads, creating a significant attack surface for malicious actors. The vulnerability was discovered in the dev master commit 15fed957fb, indicating it exists in the development version of the software and potentially affects other branches. The flaw manifests when the application processes temporary file operations without proper sanitization of file extensions or content validation, allowing attackers to upload malicious php scripts that can be executed within the application's context. The vulnerability's severity is amplified by its potential to be chained with local file inclusion (LFI) vulnerabilities, creating a multi-stage attack vector that can escalate privileges and gain full system control.
The technical implementation of this vulnerability involves the application's failure to properly validate file types during the upload process, particularly when handling json import functionality that creates temporary copies of uploaded files. Attackers can exploit this by crafting specially formatted HTTP requests that bypass normal upload restrictions, uploading php files with extensions that are not properly filtered or rejected. When combined with an LFI vulnerability, the attacker can first upload a malicious php file to a predictable location, then use the LFI component to include and execute this file, effectively gaining arbitrary code execution capabilities. The attack chain typically begins with the initial upload request that places the malicious payload, followed by subsequent requests that leverage the LFI mechanism to execute the uploaded code. This combination creates a persistent threat where attackers can establish backdoors or execute commands on the target system, potentially leading to complete compromise of the web server.
The operational impact of CVE-2023-49715 extends far beyond simple data theft, as it provides attackers with complete system control capabilities. Organizations running affected versions of WWBN AVideo face potential data breaches, system compromise, and unauthorized access to sensitive information. The vulnerability can be exploited remotely without authentication, making it particularly dangerous for publicly accessible web applications. Attackers can use this vulnerability to deploy malware, establish persistent access, perform data exfiltration, or use the compromised system as a launchpad for further attacks within the network. The chaining capability with LFI vulnerabilities means that even if the LFI component is patched, the php upload vulnerability remains exploitable, creating a persistent threat vector. This vulnerability directly maps to CWE-434 Unrestricted Upload of File with Dangerous Type, which is classified as a critical weakness in software security practices. The ATT&CK framework categorizes this vulnerability under T1190 Exploit Public-Facing Application, highlighting its potential for initial access through web application exploitation.
Mitigation strategies for CVE-2023-49715 require immediate action to address the root cause through proper input validation and file handling mechanisms. Organizations should implement strict file type validation that rejects php files regardless of extension, employ content-based file analysis to verify file integrity, and restrict write permissions on upload directories. The most effective immediate solution involves patching the application to properly sanitize file uploads and prevent execution of uploaded files. Additionally, implementing web application firewalls with rules specifically designed to detect and block malicious file upload attempts can provide additional protection layers. Network segmentation and monitoring should be enhanced to detect unusual file upload patterns and potential exploitation attempts. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components. The fix should include proper implementation of file extension whitelisting, content-type validation, and secure temporary file handling practices. Organizations should also implement proper logging and monitoring of file upload activities to detect potential exploitation attempts and maintain audit trails for forensic analysis. Regular updates and vulnerability assessments should be maintained to ensure ongoing protection against similar threats.