CVE-2023-2166 is a null pointer dereference issue found in the CAN protocol within the Linux kernel, specifically in the file net/can/af_can.c. This vulnerability allows a local user to exploit a situation where the variable ml_priv may not be initialized during the reception of CAN frames. As a consequence, this flaw could lead to system crashes or potentially result in a denial of service (DoS). The vulnerability has been classified with a CVSS score of 5.5, indicating medium severity.
Risk to organizations includes potential system crashes and service interruptions, which could significantly impact operations. Given its exploitability and the nature of the vulnerability, organizations should address this issue in their priority patch cycle.
Currently, there are no known public exploits for this vulnerability, but the possibility of future exploitation cannot be ruled out. Organizations using affected versions of the Linux kernel should prioritize patching immediately to mitigate risks.
The vulnerability was published on April 19, 2023, and is marked as 'Modified', indicating that further updates or patches may follow. It is crucial for security teams to stay vigilant and monitor for updates regarding this vulnerability.
Organizations should assess their current deployments of the Linux kernel and ensure that they are using patched versions to prevent this vulnerability from being exploited.
Vulnerability Details
The official description of CVE-2023-2166 indicates a null pointer dereference issue in the Linux kernel, specifically within the CAN protocol. This vulnerability is classified under CWE-476, which pertains to null pointer dereference errors.
The CVSS score of 5.5 reflects a medium severity level, with an attack vector classified as LOCAL, requiring low attack complexity and low privileges. User interaction is not necessary for exploitation.
The affected product is the Linux kernel, specifically versions up to and including 6.1, along with various release candidates. The vulnerability was disclosed on April 19, 2023.
Technical Analysis
The root cause of the vulnerability lies in the null pointer dereference occurring when the variable ml_priv is not properly initialized. This can happen in the receive path of CAN frames, leading to a situation where a local user could exploit this flaw.
The attack vector is local, meaning an attacker must have access to the system to exploit this vulnerability. The attack complexity is low, and only low privileges are required, making it easier for potential attackers to execute a successful exploit.
No user interaction is required for exploitation, which increases the risk. The impact on availability is high, as successful exploitation could lead to a complete system crash or service outage.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2023-2166 is significant, particularly for organizations relying on Linux systems for critical operations. The potential for system crashes means that businesses could experience downtime, which may result in financial losses and reputational damage.
Organizations should consider the blast radius of this vulnerability, as it could affect all systems running the unpatched Linux kernel. The urgency for remediation is underscored by the reported CVSS score and the absence of known public exploits at this time, indicating a window of opportunity for attackers.
Based on the CVSS and the fact that this vulnerability is not included in the KEV catalog, organizations should schedule remediation at the earliest to mitigate risks effectively.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include all versions of the Linux kernel prior to 6.1. This encompasses various release candidates and potentially impacts systems relying on these versions.
Mitigation & Remediation
Organizations should apply the latest patches to the Linux kernel to mitigate this vulnerability. The recommended version is to upgrade to the latest stable release beyond 6.1.
If a patch is unavailable, organizations should consider implementing configuration hardening and network controls to limit exposure. Additionally, monitoring for unusual system behavior can help detect potential exploitation attempts.
For comprehensive security assessments, organizations may engage in penetration testing services to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, such as unexpected crashes or unusual system behavior. Behavioral anomalies in the system can also signal potential exploitation.
AppSecure Threat Intelligence Insight
The significance of CVE-2023-2166 lies in its ability to represent broader trends in kernel vulnerabilities. As systems become increasingly reliant on the Linux kernel, understanding and addressing such vulnerabilities is paramount for maintaining operational integrity.
This vulnerability serves as a reminder for security teams to implement robust testing and validation processes, ensuring that systems are resilient against potential threats.
Organizations should also consider engaging in penetration testing methodology training to enhance their defensive capabilities.
Ultimately, proactive measures and continuous monitoring are essential to safeguarding systems from vulnerabilities like CVE-2023-2166.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)