CVE-2023-34944 in Chamilo
Summary
by MITRE • 06/14/2023
An arbitrary file upload vulnerability in the /fileUpload.lib.php component of Chamilo 1.11.* up to v1.11.18 allows attackers to execute arbitrary code via uploading a crafted SVG file.
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Analysis
by VulDB Data Team • 01/10/2026
The vulnerability identified as CVE-2023-34944 represents a critical arbitrary file upload flaw within the Chamilo learning management system version 1.11.* up to v1.11.18. This vulnerability specifically affects the /fileUpload.lib.php component, which serves as a core file handling mechanism within the platform's infrastructure. The flaw stems from inadequate input validation and sanitization processes that fail to properly inspect or reject malicious file types during the upload process. Attackers can exploit this weakness by crafting specially designed SVG files that contain embedded malicious code, bypassing the intended security controls that should prevent execution of potentially harmful content.
The technical implementation of this vulnerability aligns with CWE-434, which describes the improper restriction of file uploads, a category that encompasses the failure to validate file types and content properly. This weakness creates a direct pathway for remote code execution attacks, as the system does not adequately distinguish between legitimate SVG files and those containing malicious payloads. The vulnerability operates at the application layer, specifically targeting the file handling logic that processes user-uploaded content within the Chamilo platform. The flaw essentially allows an attacker to upload a file that appears to be a standard image format but contains executable code that gets processed and executed within the target environment.
From an operational perspective, this vulnerability presents a severe risk to organizations using Chamilo LMS, as it provides attackers with a means to gain unauthorized access to the system and potentially escalate privileges. The attack vector is particularly concerning because SVG files are commonly used for images and are often trusted by web applications, making them an ideal vehicle for bypassing security controls. Successful exploitation could enable attackers to execute arbitrary commands on the server, potentially leading to complete system compromise, data exfiltration, or the establishment of persistent backdoors within the educational platform. The impact extends beyond individual system compromise to affect the entire user base and institutional data integrity.
Mitigation strategies for this vulnerability should include immediate patching of the Chamilo platform to version 1.11.19 or later, which contains the necessary fixes for the file upload validation logic. Organizations should also implement additional security measures such as restricting file upload capabilities to trusted users only, implementing strict file type validation using multiple verification methods including content inspection, and deploying web application firewalls to detect and block malicious upload attempts. The remediation process should incorporate principle of least privilege access controls, ensuring that file upload functionality is restricted to administrative users with proper authentication and authorization. Security monitoring should be enhanced to detect unusual file upload patterns and suspicious file content, while regular security assessments should be conducted to identify similar vulnerabilities in other components of the system. This vulnerability demonstrates the critical importance of proper input validation and the need for comprehensive security testing of file handling components in web applications.