CVE-2021-45095 is a medium-severity vulnerability found in the Linux kernel, specifically in the function pep_sock_accept located in net/phonet/pep.c. This vulnerability allows a refcount leak, which can lead to potential issues in resource management. The vulnerability affects all versions of the Linux kernel up to 5.15.8. This situation is critical as it poses a significant risk due to its high confidentiality impact.
The CVSS score for this vulnerability is 5.5, indicating a medium severity level. It is classified as having a local attack vector with low complexity, requiring low privileges and no user interaction. Given these factors, the urgency for organizations to address this vulnerability is moderate.
Risk to organizations includes potential unauthorized access to sensitive information, which could compromise system integrity and confidentiality. Although no public exploits have been reported, it is essential to prioritize remediation to mitigate any potential threats.
Organizations should prioritize patching immediately to mitigate the risk associated with CVE-2021-45095. Implementing the necessary updates is crucial to ensure the security and stability of the affected systems.
Vulnerability Details
The vulnerability allows a refcount leak in the Linux kernel, specifically within the pep_sock_accept function. This issue arises from improper management of reference counts, which can lead to resource leaks and potential unauthorized access to sensitive data.
The CVSS v3.1 score of 5.5 indicates a medium severity classification. The attack vector is local, meaning an attacker must have local access to exploit this vulnerability. The attack complexity is low, requiring minimal skill to exploit.
The affected products include the Linux kernel and Debian Linux versions up to 5.15.8. The vulnerability was published on December 16, 2021, and is classified under CWE-200, indicating that it involves information exposure.
Technical Analysis
The root cause of this vulnerability is a refcount leak, which occurs when the reference count for a resource is not properly decremented. This can lead to various issues, including memory exhaustion or unauthorized access to sensitive information.
The attack vector is local, as attackers need access to the system to exploit this vulnerability. The attack complexity is low, which means that it does not require advanced skills or knowledge to execute. Privileges required to exploit this vulnerability are low, meaning that an attacker could potentially use it without elevated permissions.
User interaction is not required, making this vulnerability particularly concerning. The confidentiality impact is rated high, indicating that sensitive information could be exposed. However, there is no impact on integrity or availability.
Risk & Impact Analysis
Real-world deployment risk for CVE-2021-45095 includes potential unauthorized access to sensitive data, which can have severe implications for organizations. The vulnerability's local attack vector means that an attacker would need some level of access to exploit it, but the low complexity and required privileges increase the risk significantly.
This vulnerability could potentially lead to data leaks, affecting data confidentiality and leading to reputational damage. Organizations should assess their exposure to this vulnerability and take necessary actions to mitigate risks.
Given the CVSS score of 5.5, organizations should address this issue in their priority patch cycle to minimize risk exposure. Although not classified as critical, the potential impacts warrant immediate attention.
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 5.15.8, along with Debian Linux versions 9.0, 10.0, and 11.0. Organizations should ensure they are running patched versions to mitigate this vulnerability.
Mitigation & Remediation
To address CVE-2021-45095, organizations should apply the latest patches provided by their Linux distribution. For Debian users, patches have been released to remediate this vulnerability. Organizations should refer to the Debian security advisories for specific patching instructions. Additionally, implementing configuration hardening and monitoring network traffic can help mitigate potential exploitation.
Organizations may also consider engaging in penetration testing to identify and remediate any vulnerabilities in their systems.
Detection Guidance
To monitor for potential exploitation of this vulnerability, organizations should review system logs for any anomalies related to the pep_sock_accept function. Additionally, monitoring for unusual network traffic patterns may help identify exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2021-45095 highlights the ongoing challenges in managing vulnerabilities within the Linux kernel. This case underscores the importance of proactive vulnerability management and regular updates to mitigate security risks. Security teams should prioritize monitoring for similar vulnerabilities in their infrastructure.
The trends in Linux kernel vulnerabilities emphasize the need for continuous security assessments. Organizations should ensure they are familiar with the latest security practices, including penetration testing methodology and maintain an effective incident response plan.
Organizations can also benefit from adopting a comprehensive vulnerability management program to streamline the remediation process and enhance overall security posture.
As the landscape of vulnerabilities continues to evolve, staying informed about emerging threats and remediation strategies is crucial for maintaining security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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