EUVD-2025-93542

Comprehensive Technical Analysis of EUVD-2025-93542

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-93542 pertains to a double fetch issue in the sandbox kernel driver of Avast/AVG Antivirus versions prior to 25.3. This flaw allows a local attacker to escalate privileges via a pool overflow. The CVSS (Common Vulnerability Scoring System) base score of 9.9 indicates 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:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Attack Complexity): The attack complexity is low.
• PR:L (Privileges Required): Low privileges are required to exploit the vulnerability.
• UI:N (User Interaction): No user interaction is required.
• S:C (Scope): The scope of the vulnerability changes.
• C:H (Confidentiality Impact): High impact on confidentiality.
• I:H (Integrity Impact): High impact on integrity.
• A:H (Availability Impact): High impact on availability.

Given these metrics, the vulnerability poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves a local attacker exploiting the double fetch issue in the sandbox kernel driver. This can be achieved through the following steps:

1. Initial Access: The attacker gains initial access to the system with low privileges.
2. Exploitation: The attacker exploits the double fetch vulnerability to cause a pool overflow.
3. Privilege Escalation: The pool overflow allows the attacker to escalate privileges, potentially gaining administrative access.
4. Post-Exploitation: With elevated privileges, the attacker can perform various malicious activities, such as data exfiltration, installing malware, or compromising other systems within the network.

3. Affected Systems and Software Versions

The vulnerability affects the following products and versions:

• Avast Antivirus: Versions prior to 25.3 (Free, Premium, Ultimate)
• AVG Antivirus: Versions prior to 25.3 (Free, Internet Security, Ultimate)
• Avast One: Versions prior to 25.3

4. Recommended Mitigation Strategies

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

1. Update Software: Immediately update Avast/AVG Antivirus and Avast One to version 25.3 or later.
2. Restrict Access: Limit user privileges to the minimum necessary for their roles.
3. Monitoring: Implement continuous monitoring to detect any unusual activities that may indicate an exploitation attempt.
4. Patch Management: Ensure a robust patch management process to apply security updates promptly.
5. Network Segmentation: Segment the network to limit the lateral movement of attackers within the network.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations and individuals relying on Avast/AVG Antivirus solutions. Given the widespread use of these antivirus products, the potential impact could be extensive, affecting both private and public sectors. The high CVSS score underscores the urgency for immediate remediation to prevent widespread exploitation.

6. Technical Details for Security Professionals

Vulnerability Details:

• Type: Double fetch in sandbox kernel driver
• Impact: Pool overflow leading to privilege escalation
• Exploitability: Requires local access with low privileges

Detection and Response:

• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to detect anomalous activities related to kernel driver operations.
• Response: Develop an incident response plan that includes steps for isolating affected systems, applying patches, and conducting forensic analysis to identify the extent of the compromise.

References:

• Security Advisories: Gen Digital Security Advisories
• NVD Entry: CVE-2025-13032

Conclusion: The vulnerability EUVD-2025-93542 is critical and requires immediate attention from cybersecurity professionals. Organizations should prioritize updating their antivirus software to the latest version and implement robust security measures to mitigate the risk of exploitation. Continuous monitoring and a proactive approach to patch management are essential to safeguard against such high-severity vulnerabilities.