In the Linux kernel, a medium-severity vulnerability has been identified that allows untrusted virtual functions (VFs) to manipulate administratively set MAC addresses. The vulnerability arises when a physical function (PF) sets a VF's MAC address and the VF is subsequently put down, allowing the VF to remove its MAC from MAC filters. This can lead to potential network manipulation and integrity issues.
The CVSS score for this vulnerability is 6.3, indicating a medium severity level. This score reflects a local attack vector with high attack complexity, low privileges required, and no user interaction needed. As such, organizations should be aware of the potential risk to their networks and prioritize remediation efforts.
Risk to organizations includes unauthorized manipulation of MAC addresses, which can disrupt network communications and lead to further vulnerabilities being exploited. As network security remains critical, addressing this vulnerability should be a priority for affected systems.
Currently, there are no known exploits in the wild for this vulnerability, but organizations should remain vigilant. Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability identified in the Linux kernel is described as follows: 'i40e: Do not allow untrusted VF to remove administratively set MAC.' When the PF administratively sets a VF's MAC address and the VF is put down, it attempts to delete all MACs, leading to the MAC being removed from MAC filters and the primary VF MAC being zeroed. This should not be allowed for untrusted VFs.
The vulnerability is classified under CVSS v3.1 with a score of 6.3, reflecting the following metrics:
Metric | Value |
|---|---|
Attack Vector | LOCAL |
Attack Complexity | HIGH |
Privileges Required | LOW |
User Interaction | NONE |
Confidentiality Impact | NONE |
Integrity Impact | HIGH |
Availability Impact | HIGH |
Risk & Impact Analysis
The potential risk to organizations includes unauthorized access and manipulation of network resources. The vulnerability can affect network integrity and lead to further exploitation if not addressed. Organizations should assess the real-world deployment risk and implement necessary patches.
Given the CVSS score of 6.3 and the fact that there are currently no known exploits, organizations should schedule remediation in their patch cycle. Regular vulnerability assessments should also be conducted to identify such risks proactively.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of the Linux kernel are affected: - All versions prior to vendor patch for 6.1.79 - All versions between 6.2 and 6.6.18 (exclusive) - All versions between 6.7 and 6.7.6 (exclusive) - 6.8:rc1, 6.8:rc2, 6.8:rc3, 6.8:rc4
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply patches provided by the Linux vendor. The following patches address the issue: - [Patch 1](https://www.appsecure.security) - [Patch 2](https://www.appsecure.security) - [Patch 3](https://www.appsecure.security) Organizations should also implement configuration hardening and monitor network activity for anomalies.
Detection Guidance
Organizations should monitor system logs for indicators of unauthorized MAC address changes. Behavioral anomalies in network traffic should also be looked for, including unexpected device behaviors that may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to compromise network integrity through unauthorized MAC address manipulations. It serves as a reminder of the need for comprehensive monitoring and proactive security measures. Security teams should consider regular penetration testing and vulnerability assessments to identify similar weaknesses in their environments.
Furthermore, organizations should stay informed about emerging trends in network vulnerabilities and ensure that their security programs are adaptive to evolving threats. For more information on penetration testing strategies, refer to our guide on [penetration testing methodology](https://www.appsecure.security/blog/penetration-testing-methodology).
Incorporating continuous security testing can be beneficial to consistently evaluate the security posture of the network. For more insights on continuous security testing, visit our page on [continuous penetration testing](https://www.appsecure.security/continuous-penetration-testing).
Lastly, organizations should consider engaging in a comprehensive risk assessment framework to ensure that all potential vulnerabilities are identified and remediated promptly. For assistance, refer to our [vulnerability management program design](https://www.appsecure.security/blog/vulnerability-management-program-design).
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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