Data-races around sysctl_tcp_fastopen in Kernel
Summary
GSD-2022-1004343: tcp: Fix data-races around sysctl_tcp_fastopen. Affects Kernel versions >= 2100c8d2d9db23c0a09901a782bb4e3b21bee298, < 539d9ab79eba3974b479cad61a8688c41fe62e12. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that provides core services and functions. It manages system resources, facilitates communication between hardware and software, and enables the execution of user programs. 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 data-races around sysctl_tcp_fastopen in the Kernel can result in concurrent access to shared resources without proper synchronization. This can lead to race conditions, where the outcome of operations becomes dependent on the timing of events. Attackers may exploit these race conditions to manipulate or corrupt data, potentially leading to denial of service, information disclosure, or privilege escalation. The vulnerability was introduced in version v3.6 of the Kernel and has been fixed in version v5.15.58.
How To Fix
No fixed version is published for this vulnerability.
To fix the data-races around sysctl_tcp_fastopen vulnerability, it is recommended to update the Linux Kernel to version v5.15.58 or later. This can be done by obtaining the latest version from the official Linux Kernel repository and following the installation instructions provided. Additionally, it is advisable to regularly update the Kernel to ensure the latest security patches and bug fixes are applied.
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Workaround
As a workaround, users can disable the sysctl_tcp_fastopen feature in the Kernel. This can be achieved by modifying the relevant sysctl configuration file or using the sysctl command-line tool to set the corresponding parameter to 0. However, disabling this feature may impact the performance of TCP connections, particularly in scenarios where fast establishment is desired.
Conclusion
The data-races around sysctl_tcp_fastopen vulnerability in the Kernel can have serious security implications, potentially leading to denial of service, information disclosure, or privilege escalation. It is crucial to update the Linux Kernel to version v5.15.58 or later to fix this vulnerability. Additionally, users can temporarily disable the sysctl_tcp_fastopen feature as a workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially be exploited by attackers to manipulate or corrupt data, leading to denial of service, information disclosure, or privilege escalation.
You can use the Vulert Playground at Vulert 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.
Yes, the data-races around sysctl_tcp_fastopen vulnerability has been fixed in version v5.15.58 of the Linux Kernel. It is recommended to update to this version or later to mitigate the vulnerability.
Yes, as a temporary measure, you can disable the sysctl_tcp_fastopen feature in the Kernel. This can be done by modifying the relevant sysctl configuration file or using the sysctl command-line tool to set the corresponding parameter to 0.
At the time of this report, there are no known exploits specifically targeting the data-races around sysctl_tcp_fastopen vulnerability. However, it is important to apply the necessary updates and security patches to mitigate potential risks.
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