Data-races around sysctl_tcp_fastopen in Kernel
Summary
GSD-2022-1004672: tcp: Fix data-races around sysctl_tcp_fastopen. Affects Kernel versions >= 2100c8d2d9db23c0a09901a782bb4e3b21bee298, < 25d53d858a6c0b89a6e69e376c2a57c4f4c2c8cc. 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 between hardware and software. It manages system resources, facilitates communication between processes, and handles various system operations. The sysctl_tcp_fastopen feature in the Kernel allows for faster TCP connection establishment 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 simultaneously without proper synchronization. In this case, concurrent access to the sysctl_tcp_fastopen parameter can result in race conditions, leading to inconsistent or incorrect behavior. Attackers may exploit this vulnerability to manipulate the parameter's value, potentially bypassing security measures or causing system instability. The vulnerability was introduced in Kernel version v3.6 and is fixed in version v5.4.208.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The data-races around sysctl_tcp_fastopen in the Kernel can lead to unpredictable behavior and potential security risks. It is recommended to update the Kernel to version v5.4.208 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to unpredictable behavior and potential security risks. Attackers may exploit it to manipulate the sysctl_tcp_fastopen parameter, potentially bypassing security measures or causing system instability.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it in real-time to identify any open-source vulnerabilities, including this one.
Currently, there are no known workarounds for this vulnerability. It is recommended to update the Kernel to the fixed version.
The vulnerability itself does not allow remote exploitation. However, if an attacker gains access to the system, they may exploit the vulnerability to manipulate the sysctl_tcp_fastopen parameter.
There is no evidence of active exploits targeting this vulnerability at the moment. However, it is crucial to apply the recommended update to mitigate potential risks.
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