CVE-2021-43267 is a critical vulnerability discovered in the Linux kernel's Transparent Inter-Process Communication (TIPC) functionality. This vulnerability allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type, which can lead to severe consequences. The CVSS score assigned to this vulnerability is 9.8, indicating its high severity and potential impact on systems that rely on the affected versions of the Linux kernel.
The risk to organizations includes potential compromise of confidentiality, integrity, and availability of systems, as attackers may leverage this vulnerability to execute arbitrary code or disrupt services. Given the critical nature of this vulnerability and its exploitation status, organizations should prioritize patching immediately.
As of the latest updates, there is evidence that exploits may exist, and organizations must act swiftly to mitigate the risk. It is essential for security teams to ensure that their systems are updated to the latest versions of the Linux kernel to prevent potential breaches.
The vulnerability was published on November 2, 2021, and has since been modified to reflect its critical status. Organizations using affected versions of the Linux kernel must take immediate action to secure their environments.
Vulnerability Details
An issue was discovered in net/tipc/crypto.c in the Linux kernel before 5.14.16. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type. This vulnerability has been assigned a CVSS score of 9.8, indicating its critical severity. The affected products include various versions of the Linux kernel, including Fedora and NetApp firmware.
Technical Analysis
The root cause of the vulnerability lies in the insufficient validation of user-supplied sizes within the TIPC message handling. The attack vector is network-based, requiring low complexity and no privileges or user interaction for successful exploitation. The impacts of this vulnerability include high confidentiality, integrity, and availability impacts, making it a critical threat.
Risk & Impact Analysis
Real-world deployment risk is significant, as organizations using affected Linux kernel versions may face severe disruptions and data breaches. The blast radius could extend to any system running the vulnerable kernel, potentially affecting a wide range of applications and services. The urgency for remediation is critical due to the high CVSS score, and organizations should address this vulnerability as a priority.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of the Linux kernel prior to 5.14.16, including Fedora versions 34 and 35, as well as multiple NetApp firmware versions (H300s, H500s, H700s, H300e, H500e, H700e, H410s). Organizations should verify their current kernel version against the known vulnerable versions.
Mitigation & Remediation
Organizations should immediately upgrade to patched versions of the Linux kernel, specifically versions 5.14.16 or later. If immediate patching is not possible, consider implementing network segmentation and access controls to limit exposure until a patch can be applied. Organizations may also benefit from conducting a thorough security assessment, which can be facilitated by penetration testing to identify any similar vulnerabilities.
Detection Guidance
Monitoring logs for unusual activity, behavior anomalies, or unexpected errors related to the TIPC functionality can help in the early detection of attempts to exploit this vulnerability. Additionally, organizations should look for network signatures that may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-43267 highlights the ongoing need for robust validation mechanisms within kernel-level operations. Security teams should leverage the insights gained from this incident to enhance their defensive posture against similar vulnerabilities. For further reading on best practices in vulnerability management, organizations can explore our comprehensive guides on vulnerability management and penetration testing methodologies to strengthen their security frameworks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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