EUVD-2024-2262

Comprehensive Technical Analysis of EUVD-2024-2262

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-2262 affects rejetto HFS (HTTP File Server) versions before 0.52.10 on Linux, UNIX, and macOS. This vulnerability allows remote authenticated users with Upload permissions to execute OS commands. The severity of this vulnerability is rated with a CVSS Base Score of 9.9, which is considered critical. The CVSS vector CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:C/UI:N indicates the following:

• Attack Complexity (AC): Low
• Attack Vector (AV): Network
• Availability Impact (A): High
• Confidentiality Impact (C): High
• Integrity Impact (I): High
• Privileges Required (PR): Low
• Scope (S): Changed
• User Interaction (UI): None

The high scores in confidentiality, integrity, and availability impact, combined with the low complexity and network attack vector, underscore the critical nature of this vulnerability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves remote authenticated users who have Upload permissions. These users can exploit the vulnerability by uploading specially crafted files that trigger OS command execution. The root cause is the use of a shell to execute the df command with execSync instead of spawnSync in the child_process module of Node.js. This allows for command injection, enabling attackers to execute arbitrary commands on the host system.

Potential exploitation methods include:

• Command Injection: Crafting a malicious file that, when processed by the server, executes arbitrary OS commands.
• Privilege Escalation: If the server runs with elevated privileges, attackers could gain higher-level access to the system.
• Data Exfiltration: Executing commands to exfiltrate sensitive data from the server.

3. Affected Systems and Software Versions

The vulnerability affects rejetto HFS versions before 0.52.10 running on:

• Linux
• UNIX
• macOS

Users running these versions should prioritize updating to version 0.52.10 or later to mitigate the risk.

4. Recommended Mitigation Strategies

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

• Update Software: Upgrade to rejetto HFS version 0.52.10 or later, which includes the fix for this vulnerability.
• Restrict Permissions: Limit the number of users with Upload permissions to only those who absolutely need it.
• Monitor Logs: Implement robust logging and monitoring to detect any unusual activity or command execution attempts.
• Network Segmentation: Segment the network to isolate critical systems and reduce the attack surface.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security weaknesses.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of rejetto HFS in various industries. Organizations that rely on this software for file sharing and management are at risk of data breaches, unauthorized access, and potential service disruptions. The high CVSS score and the ease of exploitation make it a prime target for cybercriminals, emphasizing the need for immediate action by affected organizations.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Command Injection
• Affected Component: child_process module in Node.js
• Root Cause: Use of execSync instead of spawnSync to execute the df command
• Exploitation: Remote authenticated users with Upload permissions can upload crafted files to execute OS commands
• Mitigation: Update to rejetto HFS version 0.52.10 or later, which addresses the issue by using spawnSync instead of execSync

References:

• NVD Entry
• GitHub Commit
• GitHub Repository
• Version Comparison
• HFS Documentation

By understanding these details, security professionals can better assess the risk, implement appropriate mitigations, and ensure the security of their systems.