CVE-2024-20397 is a medium-severity vulnerability affecting the bootloader of Cisco NX-OS Software. This vulnerability allows an unauthenticated attacker with physical access to an affected device, or an authenticated local attacker with administrative credentials, to bypass NX-OS image signature verification. The risk to organizations includes unauthorized loading of unverified software, which can lead to system compromise.
The vulnerability is classified with a CVSS score of 5.2, indicating a medium severity level. This score signifies that while the attack complexity is low and no user interaction is required, the potential impact on integrity is high. Organizations should prioritize remediation of this vulnerability to mitigate risks associated with unauthorized access and potential exploitation.
Currently, there are no known public exploits for this vulnerability, and it has not been categorized as actively exploited in the wild. However, the nature of the vulnerability, combined with its potential impact, necessitates that organizations address it in their patch management cycle.
Organizations should evaluate their exposure to this vulnerability and prioritize patching or implementing corrective measures, especially in environments where physical access to devices is possible.
Vulnerability Details
A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification. This vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands, allowing them to load unverified software.
The vulnerability has been assigned a CVSS score of 5.2, indicating a medium severity level. It is categorized under CWE-284 for improper access control. This vulnerability was published on December 4, 2024.
Technical Analysis
The root cause of this vulnerability lies in the insecure bootloader settings of Cisco NX-OS Software. Attackers may leverage physical access to affected devices to exploit this vulnerability. The attack vector is classified as physical, meaning it requires direct access to the device. The attack complexity is low, as no special privileges or user interaction are needed to exploit the vulnerability.
In terms of impacts, the confidentiality impact is low, while the integrity impact is high due to the potential for unauthorized software to be loaded. There is no impact on availability. This classification underlines the importance of addressing the vulnerability promptly.
Risk & Impact Analysis
The real-world risk associated with CVE-2024-20397 is significant, particularly in environments where devices are accessible to unauthorized personnel. The potential for an attacker to bypass image signature verification poses a critical risk, as it can lead to the loading of malicious or unverified software.
Organizations need to understand the blast radius of this vulnerability, especially if their infrastructure relies heavily on Cisco NX-OS devices. The urgency for organizations to address this vulnerability is moderate, given its CVSS score of 5.2 and the lack of known public exploits.
Organizations should schedule remediation as part of their regular maintenance cycle to reduce the risks associated with this vulnerability and improve their overall security posture.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Cisco NX-OS Software prior to the vendor patch are affected by this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching their Cisco NX-OS Software to remediate this vulnerability. It is recommended to apply the latest vendor patches as soon as they are available. For environments where patching is not immediately feasible, consider implementing additional physical security measures to restrict access to affected devices.
Additionally, organizations may benefit from conducting a comprehensive security assessment to evaluate their exposure to similar vulnerabilities. Continuous penetration testing can help identify and remediate weaknesses in the security posture.
Penetration testing can provide organizations with valuable insights into their security vulnerabilities and help prioritize remediation efforts.
Detection Guidance
Organizations should monitor logs for any unusual bootloader commands or access attempts to the bootloader. Behavioral anomalies such as unauthorized physical access to network devices should be flagged for immediate investigation.
Additionally, implementing network monitoring solutions can help detect unauthorized changes to device configurations or software.
AppSecure Threat Intelligence Insight
CVE-2024-20397 highlights the importance of securing device bootloaders and ensuring that only verified software can be loaded. Organizations should learn from this vulnerability to enhance their security policies and practices.
It also serves as a reminder for organizations to regularly review and update their security configurations to prevent unauthorized access. Implementing strong physical security controls is essential in mitigating risks associated with physical access vulnerabilities.
Understanding penetration testing methodology can further assist organizations in identifying vulnerabilities and enhancing their security measures.
Designing a vulnerability management program is crucial for establishing a proactive approach to security that can adapt to emerging threats.
Conducting cloud security assessments can also help organizations understand their risk landscape and implement necessary safeguards.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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