CVE-2025-54875

Comprehensive Technical Analysis of CVE-2025-54875

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-54875

Description: FreshRSS, a free, self-hostable RSS aggregator, has a critical vulnerability in versions 1.16.0 through 1.26.3. An unprivileged attacker can exploit a hidden field (new_user_is_admin) used only in the user management admin page to create a new admin user when registration is enabled. This vulnerability is fixed in version 1.27.0.

CVSS Score: 9.8

Severity Evaluation:

• Critical: The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for complete system compromise, as an attacker can gain administrative privileges.
• Impact: The vulnerability allows an attacker to elevate privileges, leading to unauthorized access to sensitive information, modification of system settings, and potential data breaches.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unprivileged User Registration: An attacker can register as a new user when registration is enabled.
• Hidden Field Manipulation: The attacker can manipulate the hidden field new_user_is_admin during the registration process to gain administrative privileges.

Exploitation Methods:

• Direct Exploitation: The attacker can directly manipulate the registration form to include the hidden field new_user_is_admin set to true.
• Automated Scripts: An attacker could use automated scripts to register multiple admin users, potentially leading to a persistent compromise of the system.

3. Affected Systems and Software Versions

Affected Versions:

• FreshRSS versions 1.16.0 through 1.26.3

Unaffected Versions:

• FreshRSS version 1.27.0 and above

Systems:

• Any system running the affected versions of FreshRSS with user registration enabled.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to FreshRSS version 1.27.0 or later, which includes the fix for this vulnerability.
• Disable Registration: Temporarily disable user registration until the system is upgraded.

Long-Term Strategies:

• Regular Patching: Implement a regular patching and update schedule for all software components.
• Access Controls: Enforce strict access controls and monitor for unusual registration activities.
• Security Audits: Conduct regular security audits and vulnerability assessments.

5. Impact on Cybersecurity Landscape

Broader Implications:

• Privilege Escalation: This vulnerability highlights the risks associated with privilege escalation, which can lead to significant security breaches.
• Self-Hosted Applications: It underscores the importance of securing self-hosted applications, which are often targeted due to their widespread use and potential for misconfiguration.
• Hidden Fields: The use of hidden fields for administrative functions can be a security risk if not properly protected.

Industry Response:

• Awareness: Increased awareness among developers and administrators about the risks of hidden fields and the need for robust input validation.
• Best Practices: Reinforcement of best practices for securing user registration and management processes.

6. Technical Details for Security Professionals

Vulnerability Details:

• Hidden Field: The vulnerability is due to the improper handling of the new_user_is_admin hidden field, which is intended for administrative use only.
• Input Validation: The lack of proper input validation allows an attacker to manipulate this field during the registration process.

Detection and Monitoring:

• Log Analysis: Monitor registration logs for any unusual activities, such as the creation of admin users.
• Intrusion Detection: Implement intrusion detection systems (IDS) to detect and alert on suspicious registration activities.

Remediation:

• Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.
• Input Sanitization: Ensure all input fields, especially hidden ones, are properly sanitized and validated.

References:

• GitHub Pull Request
• FreshRSS Release 1.27.0
• GitHub Security Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of unauthorized access and ensure the integrity of their FreshRSS installations.