Data Races in sysctl_tcp_fastopen in Kernel
Summary
GSD-2022-1004528: tcp: Fix data-races around sysctl_tcp_fastopen. Affects Kernel versions >= 2100c8d2d9db23c0a09901a782bb4e3b21bee298, < 22938534c611136f35e2ca545bb668073ca5ef49. 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 manages system resources. It acts as an interface between the hardware and software layers, facilitating communication and coordination between various system components. The sysctl_tcp_fastopen feature in the Kernel allows for faster establishment of TCP connections by sending data in the initial SYN packet. However, this feature is vulnerable to data races, which can lead to unpredictable behavior and potential security risks.
Vulnerability Detail
The vulnerability in sysctl_tcp_fastopen arises from data races, which occur when multiple threads or processes access shared data concurrently without proper synchronization. In this case, the sysctl_tcp_fastopen feature is not adequately protected against data races, potentially leading to race conditions and inconsistent state. Attackers may exploit these vulnerabilities to manipulate the system's behavior, bypass security mechanisms, or cause denial-of-service conditions. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the sysctl_tcp_fastopen feature by modifying the relevant sysctl parameter. This can be achieved by setting the value of 'net.ipv4.tcp_fastopen' to '0' in the sysctl configuration file. Here's an example of how to disable sysctl_tcp_fastopen using the command line:
sudo sysctl -w net.ipv4.tcp_fastopen=0
Conclusion
The data races in sysctl_tcp_fastopen pose a potential security risk in the Linux Kernel. It is crucial to update the Kernel to the recommended version or apply the provided workaround to mitigate these vulnerabilities. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The sysctl_tcp_fastopen feature in the Kernel allows for faster establishment of TCP connections by sending data in the initial SYN packet. It aims to reduce connection latency and improve performance.
Data races occur when multiple threads or processes access shared data concurrently without proper synchronization. This can lead to unpredictable behavior and potential security vulnerabilities.
The vulnerability in sysctl_tcp_fastopen can be exploited by attackers to manipulate the system's behavior, bypass security mechanisms, or cause denial-of-service conditions. However, the actual impact and attack plausibility have not been proven yet.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.134 or later. This ensures that the sysctl_tcp_fastopen feature is protected against data races and eliminates the associated security risks.
Yes, users can disable the sysctl_tcp_fastopen feature by modifying the relevant sysctl parameter. This can be achieved by setting the value of 'net.ipv4.tcp_fastopen' to '0' in the sysctl configuration file or using the command line as mentioned in the 'workaround' section.
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