CVE-2023-44973 in Pro
Summary
by MITRE • 10/25/2023
An arbitrary file upload vulnerability in the component /content/templates/ of Emlog Pro v2.2.0 allows attackers to execute arbitrary code via uploading a crafted PHP file.
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Analysis
by VulDB Data Team • 02/09/2026
The vulnerability identified as CVE-2023-44973 represents a critical arbitrary file upload flaw within Emlog Pro version 2.2.0, specifically within the content templates component. This vulnerability stems from insufficient input validation and access control mechanisms that permit unauthorized file uploads to critical system directories. The flaw exists in the template management functionality where user-supplied files are not properly sanitized or restricted, creating an avenue for malicious actors to bypass security measures and upload potentially harmful content.
This arbitrary file upload vulnerability falls under the CWE-434 category, specifically CWE-434: Unrestricted Upload of File with Dangerous Type, which is classified as a high-severity issue in the Common Weakness Enumeration catalog. The vulnerability enables attackers to upload PHP files that can execute arbitrary code on the target system, providing them with complete control over the affected server. The flaw is particularly dangerous because it allows for code execution without requiring authentication, making it an attractive target for automated exploitation tools. The vulnerability exists due to inadequate file type validation, lack of proper file extension checks, and insufficient restrictions on upload directories.
The operational impact of this vulnerability is severe and multifaceted, potentially leading to complete system compromise and data exfiltration. Attackers can upload malicious PHP files that serve as backdoors, web shells, or exploit additional vulnerabilities within the system. The compromised server can then be used to launch further attacks against internal networks, establish persistent access, or serve as a command and control center for botnet activities. Additionally, the vulnerability may result in denial of service conditions, data corruption, or unauthorized access to sensitive information stored within the Emlog Pro installation. The affected system may experience performance degradation, system instability, or complete service disruption, depending on the nature of the uploaded malicious code.
Mitigation strategies for this vulnerability should include immediate implementation of proper file validation mechanisms, including strict file type checking, content verification, and restriction of upload directories. Organizations should implement the principle of least privilege by ensuring that upload directories have minimal necessary permissions and are isolated from critical system components. The system should enforce strict file extension validation and reject any files that do not conform to predefined safe types. Network-based mitigations such as web application firewalls can help detect and block suspicious upload attempts. Regular security updates and patches should be applied immediately upon availability, as this vulnerability affects a specific version of the software. Additionally, organizations should conduct thorough security assessments of their web applications, implement proper input sanitization, and establish monitoring procedures to detect unauthorized file uploads. The vulnerability aligns with ATT&CK technique T1105: Ingress Tool Transfer, which describes how adversaries move tools into a compromised system, and T1505.003: Server Software Component, which covers exploitation of vulnerable server components. Proper security hygiene including regular vulnerability scanning, code review practices, and adherence to secure coding standards should be enforced to prevent similar issues in the future.