CVE-2023-6675

Comprehensive Technical Analysis of CVE-2023-6675

1. Vulnerability Assessment and Severity Evaluation

CVE-2023-6675 is classified as an "Unrestricted Upload of File with Dangerous Type" vulnerability. This type of vulnerability allows an attacker to upload a web shell to a web server, which can lead to remote code execution (RCE). The CVSS score of 9.8 indicates a critical severity level, highlighting the potential for significant damage if exploited.

Severity Evaluation:

• CVSS Score: 9.8 (Critical)
• Impact: High
• Exploitability: High

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unrestricted File Upload: An attacker can upload a malicious file, such as a web shell, to the server.
• Remote Code Execution (RCE): Once the web shell is uploaded, the attacker can execute arbitrary commands on the server.

Exploitation Methods:

• Web Shell Upload: The attacker can craft a malicious file (e.g., a PHP script) and upload it through the vulnerable file upload functionality.
• Command Execution: The attacker can then access the uploaded web shell via a web browser or automated script to execute commands on the server.

3. Affected Systems and Software Versions

Affected Software:

• National Keep Cyber Security Services CyberMath
• Versions Affected: From v.1.4 before v.1.5

Systems:

• Any web server running the affected versions of CyberMath.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Upgrade to CyberMath version 1.5 or later, which addresses this vulnerability.
• Temporary Mitigation: Disable the file upload functionality until the system can be patched.

Long-Term Mitigation:

• Input Validation: Implement strict input validation and file type checks for uploaded files.
• Access Controls: Restrict access to the file upload functionality to authorized users only.
• Monitoring: Implement continuous monitoring and logging of file upload activities.
• Regular Audits: Conduct regular security audits and vulnerability assessments.

5. Impact on Cybersecurity Landscape

Immediate Impact:

• Compromised Servers: Unpatched servers are at high risk of being compromised, leading to data breaches and unauthorized access.
• Lateral Movement: Attackers can use the compromised server as a pivot point to move laterally within the network.

Long-Term Impact:

• Reputation Damage: Organizations may suffer reputational damage due to data breaches.
• Compliance Issues: Non-compliance with data protection regulations may result in legal consequences.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2023-6675
• CISA Vulnerability Name: CVE-2023-6675
• Description: Unrestricted Upload of File with Dangerous Type vulnerability in National Keep Cyber Security Services CyberMath allows the upload of a web shell to a web server.
• Affected Versions: CyberMath from v.1.4 before v.1.5
• CVSS Score: 9.8
• Status: Modified
• Published Date: Fri Feb 02 2024 13:15:09 GMT+0000 (Coordinated Universal Time)

References:

• Third Party Advisory

Technical Recommendations:

• File Upload Security: Implement robust file upload security measures, including file type whitelisting, file content validation, and size restrictions.
• Web Application Firewall (WAF): Deploy a WAF to detect and block malicious file upload attempts.
• Intrusion Detection Systems (IDS): Use IDS to monitor for suspicious activities related to file uploads and web shells.
• Regular Patching: Ensure that all software components are regularly updated and patched to mitigate known vulnerabilities.

Conclusion: CVE-2023-6675 represents a critical vulnerability that can be exploited to gain unauthorized access to web servers. Immediate patching and implementation of robust security measures are essential to mitigate the risk. Organizations should prioritize this vulnerability in their security management processes to protect against potential attacks.