EUVD-2023-38983

Comprehensive Technical Analysis of EUVD-2023-38983

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2023-38983 pertains to an arbitrary file upload flaw in the /fileUpload.lib.php component of Chamilo 1.11.* up to version 1.11.18. This vulnerability allows attackers to execute arbitrary code by uploading a specially crafted SVG file. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal complexity.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability has a high impact on confidentiality.
• Integrity (I): High (H) - The vulnerability has a high impact on integrity.
• Availability (A): High (H) - The vulnerability has a high impact on availability.

Given these factors, the vulnerability is considered highly critical and poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves uploading a maliciously crafted SVG file to the vulnerable /fileUpload.lib.php component. SVG files can contain embedded scripts, which, if not properly sanitized, can be executed on the server. This can lead to arbitrary code execution, allowing attackers to:

• Execute Remote Commands: Run arbitrary commands on the server.
• Gain Unauthorized Access: Elevate privileges and gain unauthorized access to sensitive data.
• Install Malware: Deploy malicious software on the server.
• Data Exfiltration: Exfiltrate sensitive information.

3. Affected Systems and Software Versions

The vulnerability affects Chamilo versions 1.11.* up to 1.11.18. Chamilo is an open-source e-learning and content management system widely used in educational institutions and organizations. Any organization running these versions of Chamilo is at risk.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following steps are recommended:

• Update Software: Upgrade to a patched version of Chamilo that addresses this vulnerability.
• Input Validation: Implement strict input validation and sanitization for file uploads, especially for SVG files.
• Disable SVG Uploads: If SVG files are not necessary, consider disabling SVG uploads entirely.
• Web Application Firewalls (WAF): Deploy WAFs to monitor and block suspicious file uploads.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments.
• Monitoring and Logging: Implement robust monitoring and logging to detect and respond to any suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for educational institutions and organizations using Chamilo. Given the critical nature of the vulnerability, it could lead to widespread data breaches, unauthorized access, and disruption of services. The high CVSS score underscores the urgency for immediate action to mitigate the risk.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Component: /fileUpload.lib.php
• Exploit Method: Uploading a crafted SVG file containing malicious scripts.
• References:
  • Chamilo Official Website
  • GitHub Commit 0d0c88c4806280ac9b70a299d6e3099269c9bc54
  • GitHub Commit f6e83550c2d17fc93a65ec4be602a78312289f37
  • Chamilo Security Issues

Aliases:

• CVE-2023-34944
• GSD-2023-34944

Assigner: Mitre

EPSS Score: 1 (indicating a low likelihood of exploitation in the wild, but this should not diminish the urgency of addressing the vulnerability)

ENISA IDs:

• Product: n/a
• Vendor: n/a

In conclusion, EUVD-2023-38983 represents a critical vulnerability that requires immediate attention from organizations using Chamilo. Implementing the recommended mitigation strategies and staying vigilant about security updates is crucial to protecting against potential exploits.