EUVD-2024-39873

Comprehensive Technical Analysis of EUVD-2024-39873

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability identified in EUVD-2024-39873 pertains to an SQL Injection (SQLi) flaw in the Zabbix frontend. Specifically, the issue resides in the CUser class within the addRelatedObjects function, which is invoked by the CUser.get function. This function is accessible to any user with API access, including those with the default User role.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.9, indicating a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): Low (L) - The attacker needs low-level privileges, such as a non-admin user account.
• User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - The vulnerability allows unauthorized access to sensitive information.
• Integrity (I): High (H) - The vulnerability allows unauthorized modification of data.
• Availability (A): High (H) - The vulnerability allows disruption of service availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can exploit this vulnerability remotely by sending crafted SQL queries through the API.
• Privilege Escalation: Non-admin users with API access can escalate their privileges by exploiting the SQLi vulnerability.

Exploitation Methods:

• SQL Injection: The attacker can inject malicious SQL code into the addRelatedObjects function, leading to unauthorized data access, modification, or deletion.
• Data Exfiltration: The attacker can extract sensitive information from the database.
• Service Disruption: The attacker can execute SQL commands that disrupt the normal operation of the Zabbix frontend.

3. Affected Systems and Software Versions

Affected Versions:

• Zabbix 6.4.0 to 6.4.16
• Zabbix 6.0.0 to 6.0.31
• Zabbix 7.0.0 to 7.0.1

Affected Systems:

• Any system running the affected versions of Zabbix with the frontend exposed to the network.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to the latest version of Zabbix that includes the security fix for this vulnerability.
• Access Control: Restrict API access to trusted users and implement strong authentication mechanisms.
• Input Validation: Implement robust input validation and sanitization to prevent SQL injection attacks.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Monitoring: Implement monitoring and logging to detect and respond to suspicious activities.
• Training: Provide training for administrators and users on secure coding practices and awareness of SQL injection risks.

5. Impact on European Cybersecurity Landscape

Impact Assessment:

• Widespread Use: Zabbix is widely used in Europe for network monitoring, making this vulnerability a significant risk.
• Data Breaches: Exploitation of this vulnerability can lead to data breaches, affecting confidentiality, integrity, and availability.
• Compliance Risks: Organizations may face compliance issues with regulations such as GDPR if sensitive data is compromised.

Regulatory Implications:

• GDPR Compliance: Organizations must ensure they comply with GDPR by protecting personal data and reporting breaches promptly.
• ENISA Guidelines: Follow ENISA guidelines for incident response and vulnerability management.

6. Technical Details for Security Professionals

Technical Analysis:

• Vulnerable Function: The addRelatedObjects function in the CUser class is vulnerable to SQL injection.
• Exploitation Path: The vulnerability is triggered when the CUser.get function is called, which in turn calls addRelatedObjects.
• Mitigation Code: Ensure that all SQL queries are parameterized and that user inputs are properly sanitized.

Detection and Response:

• Intrusion Detection: Implement intrusion detection systems (IDS) to monitor for unusual SQL query patterns.
• Incident Response: Develop an incident response plan that includes steps for identifying, containing, and remediating SQL injection attacks.

Conclusion: The vulnerability EUVD-2024-39873 is a critical SQL injection flaw in the Zabbix frontend that can be exploited by non-admin users with API access. Immediate patching and robust security measures are essential to mitigate the risk. Organizations should prioritize updating to the latest secure versions and implementing strong access controls and monitoring to protect against potential exploitation.

References:

• Zabbix Support
• ENISA Guidelines

This comprehensive analysis should help cybersecurity professionals understand the severity and implications of the vulnerability, as well as the necessary steps to mitigate the risk effectively.