CVE-2023-52154 in PMB
Summary
by MITRE • 02/22/2024
File Upload vulnerability in pmb/camera_upload.php in PMB 7.4.7 and earlier allows attackers to run arbitrary code via upload of crafted PHTML files.
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Analysis
by VulDB Data Team • 08/30/2024
The vulnerability identified as CVE-2023-52154 represents a critical file upload flaw within the PMB 7.4.7 content management system and earlier versions. This vulnerability exists in the pmb/camera_upload.php component which handles file uploads from users. The flaw stems from insufficient input validation and sanitization of uploaded files, particularly allowing malicious actors to bypass security restrictions through the upload of specially crafted phtml files. The issue is classified under CWE-434 which specifically addresses insecure file upload handling, where applications fail to properly validate file types and content before storing them on the server.
The technical exploitation of this vulnerability occurs when an attacker uploads a malicious phtml file that contains executable code. PHTML files are PHP files with a .phtml extension that are interpreted by the web server as PHP scripts. When such files are uploaded to the server through the vulnerable camera_upload.php endpoint, they can be executed by the web server, providing attackers with arbitrary code execution capabilities. This allows for complete compromise of the affected system, including potential access to sensitive data, privilege escalation, and further network infiltration. The vulnerability is particularly concerning because it enables attackers to execute code directly on the web server without requiring authentication or specific privileges.
The operational impact of CVE-2023-52154 extends beyond simple code execution to encompass full system compromise and potential data breaches. Attackers can leverage this vulnerability to establish persistent backdoors, exfiltrate sensitive information, or use the compromised system as a launch point for attacking other systems within the network. The vulnerability affects organizations using PMB 7.4.7 or earlier versions, which may include educational institutions, government agencies, or private enterprises relying on this content management system for their digital infrastructure. The attack surface is broad since the vulnerability is present in a core file upload functionality that is commonly used for media management and content creation purposes. Organizations may face regulatory compliance issues and potential legal consequences if sensitive data is compromised through this vulnerability.
Mitigation strategies for CVE-2023-52154 primarily focus on immediate remediation and enhanced security controls. The most effective immediate solution is to upgrade to PMB version 7.4.8 or later where this vulnerability has been addressed through proper file type validation and content sanitization. Organizations should also implement additional security layers including strict file type validation, content inspection of uploaded files, and implementation of web application firewalls to detect and block malicious file uploads. Access controls should be enhanced to limit upload permissions to authorized users only, and uploaded files should be stored in non-executable directories. The vulnerability aligns with ATT&CK technique T1190 which covers exploiting vulnerabilities in web applications, and T1059 which involves executing malicious code through various means including web shells. Security teams should also conduct regular vulnerability assessments and penetration testing to identify similar issues in their web applications and ensure proper security configurations are in place to prevent similar vulnerabilities from being exploited in the future.