EUVD-2025-4457

Comprehensive Technical Analysis of EUVD-2025-4457

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-4457 pertains to a remote code execution (RCE) flaw in the ZScript function of ZDoom Team GZDoom v4.13.1. This vulnerability allows attackers to execute arbitrary code by supplying a crafted PK3 file containing a malicious ZScript source file. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical risk.

CVSS Base Score Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• PR:N (No Privileges Required): No privileges are required to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:U (Unchanged): The scope of the vulnerability does not change.
• C:H (High Confidentiality Impact): The vulnerability can lead to a high impact on confidentiality.
• I:H (High Integrity Impact): The vulnerability can lead to a high impact on integrity.
• A:H (High Availability Impact): The vulnerability can lead to a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Attackers can exploit this vulnerability remotely by sending a crafted PK3 file to the target system.
• Phishing and Social Engineering: Attackers may use phishing techniques to trick users into downloading and executing the malicious PK3 file.

Exploitation Methods:

• Crafted PK3 Files: The primary method involves creating a PK3 file with a malicious ZScript source file designed to execute arbitrary code when processed by the vulnerable ZScript function.
• Automated Scripts: Attackers may use automated scripts to distribute the malicious PK3 files to multiple targets simultaneously.

3. Affected Systems and Software Versions

Affected Software:

• ZDoom Team GZDoom v4.13.1

Potentially Affected Systems:

• Any system running the vulnerable version of GZDoom, including gaming platforms, personal computers, and servers hosting GZDoom-based applications.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Ensure that all instances of GZDoom are updated to the latest version that addresses this vulnerability.
• Network Segmentation: Implement network segmentation to isolate vulnerable systems from critical infrastructure.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity related to PK3 file transfers.

Long-Term Strategies:

• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar vulnerabilities.
• User Education: Educate users about the risks of downloading and executing files from untrusted sources.
• Endpoint Protection: Implement robust endpoint protection solutions to detect and block malicious files.

5. Impact on European Cybersecurity Landscape

The critical nature of this vulnerability poses significant risks to the European cybersecurity landscape. Organizations and individuals using the affected software are at risk of remote code execution attacks, which can lead to data breaches, system compromises, and loss of service. The widespread use of GZDoom in gaming communities and potential integration into other applications amplifies the potential impact.

6. Technical Details for Security Professionals

Vulnerability Details:

• Vulnerable Component: ZScript function in GZDoom v4.13.1
• Exploit Mechanism: The vulnerability is triggered by processing a crafted PK3 file containing a malicious ZScript source file.
• Exploit Code: Proof-of-concept (PoC) exploit code is available on GitHub (https://github.com/Chainmanner/GZDoom-Arbitrary-Code-Execution-via-ZScript-PoC).

Detection and Response:

• Indicators of Compromise (IoCs): Monitor for unusual PK3 file transfers and ZScript function calls.
• Log Analysis: Analyze logs for any anomalies related to ZScript execution and PK3 file processing.
• Incident Response: Develop an incident response plan that includes steps for isolating affected systems, patching vulnerabilities, and conducting forensic analysis.

References:

• NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2024-54756
• GitHub PoC: https://github.com/Chainmanner/GZDoom-Arbitrary-Code-Execution-via-ZScript-PoC
• Full Disclosure: https://seclists.org/fulldisclosure/2025/Feb/11

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with EUVD-2025-4457 and enhance their overall cybersecurity posture.