CVE-2024-27397 is a high-severity vulnerability in the Linux kernel that affects multiple versions. This vulnerability allows for potential privilege escalation due to improper timeout checks in the netfilter subsystem, specifically within the nf_tables component. The Linux kernel's handling of timestamps for set elements during transactions is flawed, leading to a situation where elements may expire while control plane transactions are still in progress.
The CVSS score for this vulnerability is 7, categorizing it as high severity. The attack vector is local, meaning that an attacker must have local access to the system to exploit this vulnerability. With a high attack complexity and low privileges required, it poses a significant risk, particularly in environments where unauthorized access could lead to further system compromise.
Risk to organizations includes unauthorized access to sensitive information, potential system crashes, and disruption of services due to the exploitation of this vulnerability. Given the local attack vector, the urgency for defenders is high; organizations should prioritize patching immediately.
Currently, there are known exploits available for this vulnerability, which increases the urgency for organizations to address it. Failure to remediate could lead to significant operational and security risks.
Vulnerability Details
The official description of CVE-2024-27397 states that the issue is resolved by adding a timestamp field at the beginning of the transaction and storing it in the nftables per-netns area. The update affects the set backend's .insert, .deactivate, and sync gc path to utilize the timestamp, thus preventing elements from expiring while the transaction is still unfinished.
The vulnerabilities are classified under CWE-416, indicating a use-after-free vulnerability. The Linux kernel versions affected include those from 4.1 up to 4.19.320, as well as various versions between 4.20 and 6.8. Specific version ranges are outlined in the configurations section.
The CVSS score reflects a high impact on confidentiality, integrity, and availability, making it critical for organizations to assess their systems and implement the necessary patch.
Technical Analysis
The root cause of CVE-2024-27397 lies in the way the Linux kernel manages timestamp checks for set elements in the nf_tables component. When a transaction is initiated, the system should accurately track the state of elements to prevent premature expiration.
The attack vector is local, meaning an attacker must have access to the system to exploit this vulnerability. The attack complexity is high, as it requires an understanding of the kernel's internal mechanisms and the specific conditions under which the vulnerability can be exploited.
No user interaction is required, allowing an attacker to exploit the vulnerability once they gain access. The impacts on confidentiality, integrity, and availability are significant, as successful exploitation can lead to unauthorized access and control over the system.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2024-27397 is substantial. Organizations running affected versions of the Linux kernel may be vulnerable to attacks that exploit this flaw, leading to unauthorized access, data breaches, and service disruptions.
This vulnerability could have a broad blast radius, particularly in environments where multiple devices rely on a shared kernel version. The potential for privilege escalation means that an attacker could gain elevated privileges, allowing them to manipulate system configurations or access sensitive information.
Given the high CVSS score and the existence of known exploits, organizations must assess their vulnerability management processes and prioritize remediation efforts. The urgency is reflected in the need for immediate patching to prevent potential exploits.
Organizations should schedule remediation as part of their priority patch cycle to ensure that systems remain secure and compliant with security policies.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the Linux kernel include those from version 4.1 to 4.19.320, as well as various versions from 4.20 up to 6.8. Specifically, the following versions are vulnerable:
1. Versions 4.1 to 4.19.320 2. Versions 4.20 to 5.4.282 3. Versions 5.5 to 5.10.224 4. Versions 5.11 to 5.15.165 5. Versions 5.16 to 6.1.97 6. Versions 6.2 to 6.6.84 7. Versions 6.7 to 6.7.5 8. Version 6.8: rc1, rc2, rc3
Mitigation & Remediation
Organizations should ensure they are running the latest patched versions of the Linux kernel. The recommended version to upgrade to is the latest stable release that is not affected by CVE-2024-27397.
If immediate patching is not possible, organizations should implement configuration hardening measures and network controls to mitigate the risk of exploitation. Monitoring for unusual behavior and system changes is also recommended as a temporary measure.
For further guidance on security testing, organizations can explore penetration testing services to validate their security posture.
Detection Guidance
To detect potential exploitation of CVE-2024-27397, organizations should monitor logs for indicators of unexpected behavior related to the nf_tables component.
Behavioral anomalies in network traffic, particularly those involving packet filtering and firewall rules, should be investigated. Additionally, monitoring system changes that could indicate unauthorized access or privilege escalation attempts is critical.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-27397 lies in its demonstration of the challenges in maintaining kernel security, especially with complex components like nf_tables. This vulnerability highlights the necessity for ongoing vigilance and proactive security measures in kernel development.
Organizations should take this opportunity to assess their vulnerability management processes and ensure that they are equipped to handle similar issues in the future. Implementing a robust vulnerability management program can help in identifying and mitigating risks effectively.
Furthermore, this incident serves as a reminder of the importance of adopting secure coding practices and conducting regular code audits to prevent similar vulnerabilities in the future. Engaging in penetration testing methodology can also provide valuable insights into potential weak points within the system.
Finally, organizations should stay informed about the evolving threat landscape and leverage resources such as security testing best practices to enhance their defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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