EUVD-2025-10687

Comprehensive Technical Analysis of EUVD-2025-10687

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in ConnMan through version 1.44 involves the ns_resolv function in dnsproxy.c. Specifically, the lookup string can be NULL or an empty string when the TC (Truncated) bit is set in a DNS response. This condition can lead to incorrect length calculations and improper memcpy operations, potentially causing a denial of service (DoS) or arbitrary code execution.

Severity Evaluation: The CVSS (Common Vulnerability Scoring System) base score of 9.0 indicates a critical vulnerability. The vector CVSS:3.1/AV:N/AC:H/PR:N/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): High (H) - Exploiting the vulnerability requires specific conditions or knowledge.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required for the exploit to succeed.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - The vulnerability can lead to a high impact on confidentiality.
• Integrity (I): High (H) - The vulnerability can lead to a high impact on integrity.
• Availability (A): High (H) - The vulnerability can lead to a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: An attacker can send specially crafted DNS responses with the TC bit set to trigger the vulnerability.
• Man-in-the-Middle (MitM) Attacks: An attacker intercepting DNS traffic can manipulate responses to include the TC bit, leading to the vulnerability being triggered.

Exploitation Methods:

• Denial of Service (DoS): By sending malformed DNS responses, an attacker can cause the ConnMan service to crash, leading to a DoS condition.
• Arbitrary Code Execution: If the attacker can control the memory layout and exploit the incorrect memcpy operations, they may execute arbitrary code on the affected system.

3. Affected Systems and Software Versions

Affected Software:

• ConnMan versions 0 through 1.44.

Affected Systems:

• Any system running the affected versions of ConnMan, including but not limited to:
  • Embedded systems
  • IoT devices
  • Linux-based systems using ConnMan for network management

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to a patched version of ConnMan that addresses this vulnerability.
• Network Segmentation: Isolate systems running ConnMan from untrusted networks to reduce the attack surface.
• Firewall Rules: Implement strict firewall rules to limit DNS traffic to trusted sources.

Long-Term Mitigation:

• Regular Updates: Ensure that all systems are regularly updated with the latest security patches.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious DNS traffic patterns.
• Security Audits: Conduct regular security audits and vulnerability assessments.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Critical Infrastructure: ConnMan is widely used in embedded systems and IoT devices, which are integral to critical infrastructure. A successful exploit could disrupt essential services.
• Data Integrity: The potential for arbitrary code execution poses a significant risk to data integrity and confidentiality.
• Regulatory Compliance: Organizations must ensure compliance with EU regulations such as GDPR and NIS Directive, which mandate robust cybersecurity measures.

6. Technical Details for Security Professionals

Vulnerability Details:

• Code Location: The vulnerability is located in the ns_resolv function within dnsproxy.c.
• Trigger Condition: The TC bit in a DNS response causes the lookup string to be NULL or empty, leading to incorrect length calculations.
• Exploitation: The incorrect memcpy operations can result in buffer overflows, leading to potential code execution.

References:

• ConnMan Source Code
• Vulnerability Analysis
• NVD Entry

Conclusion: The vulnerability in ConnMan through version 1.44 is critical and requires immediate attention. Organizations should prioritize patching affected systems and implementing robust security measures to mitigate the risk of exploitation. The potential impact on European cybersecurity underscores the importance of proactive cybersecurity practices and compliance with regulatory standards.