EUVD-2023-28092

Comprehensive Technical Analysis of EUVD-2023-28092

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2023-28092 pertains to an incorrect access control mechanism in the decaying import function within the ACLComponent.php file of MISP (Malware Information Sharing Platform) version 2.4.167. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources.
• PR:N (No Privileges Required): No privileges are needed to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:U (Unchanged): The scope of the vulnerability does not change.
• C:H (High Confidentiality Impact): There is a high impact on the confidentiality of the system.
• I:H (High Integrity Impact): There is a high impact on the integrity of the system.
• A:H (High Availability Impact): There is a high impact on the availability of the system.

Given these metrics, the vulnerability poses a significant risk to systems running MISP 2.4.167.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is network-based, meaning an attacker can exploit it remotely without needing any special privileges or user interaction. Potential exploitation methods include:

• Unauthorized Access: An attacker could bypass the access control mechanisms to gain unauthorized access to the decaying import function.
• Data Exfiltration: Once access is gained, the attacker could exfiltrate sensitive data, leading to a breach of confidentiality.
• Data Manipulation: The attacker could manipulate or corrupt data, affecting the integrity of the information stored in MISP.
• Denial of Service (DoS): The attacker could disrupt the availability of the MISP service, causing downtime and operational disruptions.

3. Affected Systems and Software Versions

The vulnerability specifically affects MISP version 2.4.167. Organizations using this version of MISP are at risk and should prioritize updating to a patched version.

4. Recommended Mitigation Strategies

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

• Patch Management: Immediately update MISP to the latest version that includes the fix for this vulnerability. The reference commit 93bf15d3bd703a32ebfe86cb6c1c9b735cf23e30 on GitHub provides the necessary patch.
• Access Controls: Implement additional access control mechanisms to restrict access to critical functions and data.
• Network Segmentation: Segment the network to limit the attack surface and contain potential breaches.
• Monitoring and Logging: Enhance monitoring and logging to detect any unauthorized access attempts or suspicious activities.
• Regular Audits: Conduct regular security audits to identify and address vulnerabilities proactively.

5. Impact on European Cybersecurity Landscape

The European cybersecurity landscape is significantly impacted by this vulnerability, particularly for organizations that rely on MISP for threat intelligence sharing and collaboration. The high severity score and the potential for unauthorized access, data exfiltration, and service disruption make it a critical concern. Organizations in sectors such as finance, healthcare, and government, which handle sensitive information, are particularly at risk.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Component: The vulnerability resides in the ACLComponent.php file, specifically in the decaying import function.
• Exploit Mechanism: The incorrect access control allows unauthorized users to access and manipulate the decaying import function, leading to potential data breaches and service disruptions.
• Patch Reference: The GitHub commit 93bf15d3bd703a32ebfe86cb6c1c9b735cf23e30 provides the necessary fix. Security professionals should review this commit to understand the changes made and ensure they are applied correctly.
• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to detect and prevent unauthorized access attempts. Regularly review logs for any anomalies related to the decaying import function.
• Response: Develop an incident response plan specific to this vulnerability, including steps for containment, eradication, and recovery.

In conclusion, EUVD-2023-28092 represents a critical vulnerability in MISP 2.4.167 that requires immediate attention. Organizations should prioritize patching and implementing robust security measures to mitigate the risk. The European cybersecurity community should collaborate to share threat intelligence and best practices to address this and similar vulnerabilities effectively.