CVE-2025-5662

Comprehensive Technical Analysis of CVE-2025-5662

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-5662 CVSS Score: 9.8

The CVSS score of 9.8 indicates that this vulnerability is of critical severity. The high score is likely due to the potential for remote code execution (RCE), which can lead to complete system compromise. The vulnerability involves a deserialization flaw in the H2O-3 REST API, specifically in the POST /99/ImportSQLTable endpoint. This flaw allows for improper validation of JDBC connection parameters when using a Key-Value format, leading to RCE.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can send a specially crafted HTTP POST request to the /99/ImportSQLTable endpoint with malicious JDBC connection parameters.
• Network-Based Attacks: Since the vulnerability is in a REST API, it can be exploited over the network, making it accessible to remote attackers.

Exploitation Methods:

• Deserialization Attack: The attacker can exploit the deserialization process by injecting malicious serialized objects. When these objects are deserialized, they can execute arbitrary code on the server.
• JDBC Parameter Manipulation: By manipulating the JDBC connection parameters, an attacker can bypass validation checks and inject malicious code.

3. Affected Systems and Software Versions

Affected Software:

• H2O-3 REST API: All versions up to 3.46.0.7.
• MySQL JDBC Driver: Version 8.0.19.
• JDK: Version 8u112.

Resolved Version:

• H2O-3 REST API: Version 3.46.0.8.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade Software: Upgrade to H2O-3 REST API version 3.46.0.8 or later, which includes the fix for this vulnerability.
• Patch Management: Ensure that all systems using the affected versions of the MySQL JDBC Driver and JDK are patched to the latest secure versions.

Long-Term Strategies:

• Input Validation: Implement robust input validation for all API endpoints to prevent malicious data from being processed.
• Deserialization Security: Use secure deserialization libraries and practices to mitigate deserialization vulnerabilities.
• Network Security: Implement network security measures such as firewalls, intrusion detection systems (IDS), and intrusion prevention systems (IPS) to monitor and block suspicious activities.

5. Impact on Cybersecurity Landscape

Immediate Impact:

• System Compromise: Organizations using the affected versions of H2O-3 REST API are at risk of complete system compromise due to RCE.
• Data Breach: Sensitive data can be accessed or exfiltrated by attackers exploiting this vulnerability.

Long-Term Impact:

• Reputation Damage: Organizations experiencing a breach due to this vulnerability may face reputational damage and loss of customer trust.
• Compliance Issues: Failure to address this vulnerability can lead to compliance issues and potential legal consequences.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: POST /99/ImportSQLTable
• Vulnerable Component: JDBC connection parameters in Key-Value format.
• Exploitation: The vulnerability is triggered during the deserialization process of the JDBC connection parameters.

Mitigation Steps:

1. Upgrade H2O-3 REST API: Ensure all instances are upgraded to version 3.46.0.8 or later.
2. Patch Dependencies: Update the MySQL JDBC Driver and JDK to the latest secure versions.
3. Implement Security Controls: Use secure coding practices, input validation, and network security measures to prevent similar vulnerabilities in the future.

References:

• GitHub Commit
• Huntr Bounty

By following these recommendations, organizations can effectively mitigate the risks associated with CVE-2025-5662 and enhance their overall cybersecurity posture.