Vulnerability in Kernel: vsock connection interruption
Summary
GSD-2022-1000324: vsock: remove vsock from connected table when connect is interrupted by a signal. Affects Kernel versions >= d021c344051af91f42c5ba9fdedc176740cbd238, < 2910bcb9f67551a45397735e47b6d456eb8cd549. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It manages system resources, facilitates communication between software and hardware, and ensures the overall stability and security of the system. The vsock subsystem within the Kernel enables communication between virtual machines and the host system using sockets. It allows efficient data transfer and facilitates inter-VM communication. However, a vulnerability has been identified in the vsock subsystem that can lead to potential security risks.
Vulnerability Detail
The identified vulnerability in the vsock subsystem occurs when a connection attempt is interrupted by a signal. In such cases, the vsock remains in the connected table, potentially exposing the system to security threats. An attacker could exploit this vulnerability to gain unauthorized access, execute arbitrary code, or perform other malicious activities. The vulnerability was introduced in version v3.9 of the Linux Kernel and has been fixed in version v4.19.231 by commit 2910bcb9f67551a45397735e47b6d456eb8cd549.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.19.231 or later. This can be done by following the official update process provided by the Linux distribution or by manually compiling and installing the updated Kernel version. It is crucial to ensure that the updated Kernel version is compatible with the specific system configuration and dependencies.
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Workaround
As a temporary workaround, users can consider disabling the vsock subsystem if it is not essential for their system's functionality. This can be achieved by modifying the Kernel configuration and recompiling it without the vsock module. However, this workaround should only be implemented after careful consideration of the system's requirements and potential impact on other functionalities.
Conclusion
The identified vulnerability in the vsock subsystem of the Linux Kernel can pose significant security risks if left unaddressed. It is crucial to update the Kernel to version v4.19.231 or later to mitigate this vulnerability. Users can also consider implementing the temporary workaround of disabling the vsock subsystem if it is not necessary for their system. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vsock subsystem is a component of the Linux Kernel that enables communication between virtual machines and the host system using sockets. It facilitates efficient data transfer and inter-VM communication.
An attacker can exploit this vulnerability by interrupting a vsock connection attempt with a signal. This can lead to unauthorized access, execution of arbitrary code, or other malicious activities.
The vulnerability was introduced in version v3.9 of the Linux Kernel. All versions between v3.9 and v4.19.230 are potentially affected. It has been fixed in version v4.19.231 and later.
A temporary workaround is to disable the vsock subsystem if it is not essential for the system's functionality. However, this should be carefully evaluated based on the system's requirements and potential impact on other functionalities.
To update the Linux Kernel, follow the official update process provided by the Linux distribution. Alternatively, you can manually compile and install the updated Kernel version. Ensure compatibility with the system configuration and dependencies.
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