EUVD-2025-21030

Comprehensive Technical Analysis of EUVD-2025-21030

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-21030 is a stack-based buffer overflow in Easy File Sharing HTTP Server version 7.2. This flaw is triggered by sending a specially crafted POST request to the /sendemail.ghp endpoint with an overly long Email parameter. The application fails to validate the length of this field, leading to memory corruption. This vulnerability allows an unauthenticated remote attacker to execute arbitrary code with the privileges of the server process.

Severity Evaluation:

• CVSS Base Score: 9.3
• CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The high base score indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Confidentiality Impact (VC): High (H)
• Integrity Impact (VI): High (H)
• Availability Impact (VA): High (H)

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Remote Attack: An attacker can exploit this vulnerability without needing any authentication.
• Crafted POST Request: The attacker sends a malicious POST request to the /sendemail.ghp endpoint with an overly long Email parameter.

Exploitation Methods:

• Buffer Overflow: The attacker can overflow the stack buffer by sending a long Email parameter, leading to memory corruption.
• Arbitrary Code Execution: By carefully crafting the payload, the attacker can execute arbitrary code on the server, potentially gaining control over the system.

3. Affected Systems and Software Versions

Affected Software:

• Easy File Sharing HTTP Server version 7.2

Vendor:

• EFS Software Inc.

Product ID:

• ENISA ID Product: b12cdbc3-9c7c-3823-b7cc-aecdc7fa6984

Vendor ID:

• ENISA ID Vendor: a998c9d4-56ed-3ea4-b896-440b7ad1a1ba

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Apply the latest patches and updates provided by EFS Software Inc.
• Network Segmentation: Isolate the affected server from critical systems to limit the potential impact.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the /sendemail.ghp endpoint.

Long-Term Strategies:

• Input Validation: Ensure that all input fields are properly validated for length and content.
• Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.
• Security Training: Educate developers on secure coding practices to prevent future vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using Easy File Sharing HTTP Server version 7.2, particularly within the European Union. The potential for unauthenticated remote code execution can lead to data breaches, service disruptions, and unauthorized access to sensitive information. This underscores the importance of timely patching and robust security measures to protect against such threats.

6. Technical Details for Security Professionals

Exploit Details:

• Endpoint: /sendemail.ghp
• Parameter: Email
• Exploit Type: Stack-based buffer overflow
• Payload: Overly long Email parameter to trigger memory corruption

References:

• Metasploit Module: Metasploit Framework
• Exploit Database: Exploit-DB
• VulnCheck Advisory: VulnCheck Advisory

Aliases:

• CVE-2025-34096

Assigner:

• VulnCheck

EPSS:

• N/A

Conclusion:

The stack-based buffer overflow vulnerability in Easy File Sharing HTTP Server version 7.2 is a critical issue that requires immediate attention. Organizations should prioritize patching and implementing robust security measures to mitigate the risk. This vulnerability highlights the importance of continuous monitoring and proactive security practices in maintaining a secure cyber environment.