Local Privilege Escalation Vulnerability in Linux Kernel Packages
Summary
UBUNTU-CVE-2020-0066: In the netlink driver, there is a possible out of bounds write due to a race condition. Affects linux versions 3.11.0-12.19 – 3.13.0-98.145. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of Linux operating systems, responsible for managing system resources and facilitating communication between hardware and software. It provides essential services such as process management, memory management, and device control. The kernel is modular, allowing for the addition of various functionalities through loadable modules. However, vulnerabilities in the kernel can lead to severe security risks, including privilege escalation, where an attacker gains unauthorized access to system resources.
Vulnerability Detail
In the netlink driver, there is a possible out of bounds write due to a race condition. This vulnerability can lead to local escalation of privilege, requiring system execution privileges for exploitation. The issue arises from improper handling of concurrent operations, which can allow an attacker to manipulate memory and execute arbitrary code with elevated privileges. This vulnerability affects multiple versions of the Linux kernel across various distributions, making it a critical concern for system administrators and users alike.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can limit access to the affected kernel modules or restrict the execution of untrusted code. However, this is not a permanent solution and should not replace updating to the patched version.
Conclusion
The vulnerability in the netlink driver of the Linux kernel presents a significant risk of local privilege escalation. Users and administrators are urged to update their kernel packages to the latest patched versions to mitigate this risk. Regular monitoring and vulnerability assessments are essential to maintain system security.
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FAQ
The CVSS score of this vulnerability is 6.4, indicating a medium severity level.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
If exploited, this vulnerability could allow an attacker to gain unauthorized access to system resources, potentially leading to data breaches or system compromise.
Yes, multiple versions of the Linux kernel are affected, including 3.13.0-207.258 and 4.15.0-23.25~16.04.1. It is crucial to update to the latest patched version.
If an immediate update is not possible, consider implementing access controls and monitoring for suspicious activity as a temporary measure until the update can be applied.
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