CVE-2023-54045 is a vulnerability identified in the Linux kernel, specifically related to the auditing functionality. This vulnerability allows for a potential soft lockup when handling numerous PATH records generated by Tracefs or Debugfs. In certain configurations, this can lead to performance degradation and possible kernel panic.
The severity level of this vulnerability has not been officially scored. However, its implications can lead to significant operational risks if not addressed. The exploitation status is currently marked as deferred, meaning further evaluation is required before determining the urgency for remediation.
Organizations should prioritize assessing their systems for this vulnerability as part of their overall risk management strategy. Immediate action may not be necessary, but scheduling evaluations and potential updates can mitigate future risks.
Risk to organizations includes the possibility of system instability and the inability to perform critical functions due to kernel panic. Given the nature of the vulnerability, it is crucial for security teams to monitor their systems and prepare for any required patches once they become available.
Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability involves a soft lockup in the __audit_inode_child() function of the Linux kernel. It occurs under configurations where Tracefs or Debugfs generates an excessive number of PATH records. The vulnerability details indicate that if certain conditions are met, such as setting CONFIG_KASAN to 'y' and CONFIG_PREEMPTION to 'n', and executing specific commands, it can lead to tasks hanging indefinitely.
The auditctl command can be used to trigger the vulnerability, and it can manifest as a soft lockup with corresponding kernel panic messages. The proposed resolution involves adding a cond_resched() call to the __audit_inode_child() function to alleviate the issue.
Technical Analysis
The root cause of this vulnerability lies in how the Linux kernel processes audit records. When the system receives too many PATH records, it can become overwhelmed, leading to a soft lockup. This situation occurs when the CPU is unable to execute other tasks because it is busy processing the excessive audit records.
The attack vector is primarily local, as it requires access to the system to execute the commands that trigger the vulnerability. The complexity of exploitation is considered low, as it involves straightforward commands that can be executed by users with sufficient privileges.
The vulnerability does not require user interaction, and its impact on confidentiality, integrity, and availability can be significant, given the potential for kernel panic to disrupt system operations.
Risk & Impact Analysis
The risk associated with CVE-2023-54045 is moderate. Organizations utilizing the Linux kernel should be aware of the potential for system instability resulting from this vulnerability. The impact can range from temporary performance degradation to complete system unavailability, depending on how the audit system is configured and utilized.
The blast radius could extend to all systems running affected versions of the Linux kernel with the relevant auditing configurations enabled. As such, organizations should assess their exposure and develop a remediation plan to address the vulnerability.
Given the current status as deferred, organizations are advised to monitor updates related to this vulnerability and implement mitigation strategies as needed. This may include reviewing audit configurations and ensuring that kernel watchdog settings are appropriately tuned.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch.
Mitigation & Remediation
Organizations should monitor the Linux kernel for updates addressing CVE-2023-54045. In the absence of a patch, consider implementing workarounds such as adjusting the watchdog threshold or limiting the number of PATH records processed by audit configurations. Regularly review kernel configurations to ensure optimal performance and stability.
For further guidance on security best practices, organizations may refer to resources on penetration testing compliance which can help in identifying and addressing vulnerabilities in their systems.
Detection Guidance
To detect potential exploitation of CVE-2023-54045, organizations should monitor logs for unusual audit activity, excessive path record generation, and system performance anomalies. Establishing baseline performance metrics can aid in identifying deviations that may indicate attempted exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-54045 lies in its potential to impact system stability. As organizations increasingly rely on the Linux kernel for critical operations, understanding the patterns and trends associated with kernel vulnerabilities becomes essential. This incident underscores the necessity for proactive vulnerability management and the implementation of robust monitoring strategies.
Security teams should continually evaluate their configurations and auditing practices. Regular penetration testing can help identify underlying vulnerabilities and reinforce defensive measures.
Organizations should also consider integrating insights from vulnerability management programs to enhance their overall security posture and ensure timely remediation of vulnerabilities.
By prioritizing security and maintaining a proactive approach, organizations can better protect themselves against potential threats and vulnerabilities in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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