Use-after-free vulnerability in net: tw_timer_handler
Summary
GSD-2022-1000016: net: fix use-after-free in tw_timer_handler. Affects Kernel versions >= 61a7e26028b94805fd686a6dc9dbd9941f8f19b0, < 5c2fe20ad37ff56070ae0acb34152333976929b4. No fix is published. How to fix ↓
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Background
The net package in the Linux Kernel is responsible for handling network-related operations. It provides various functionalities for network communication, including managing timers. The tw_timer_handler function within the net package is responsible for handling timer events related to TCP connections. This vulnerability specifically affects the tw_timer_handler function, leading to a use-after-free issue.
Vulnerability Detail
The use-after-free vulnerability in the tw_timer_handler function can be exploited by an attacker to execute arbitrary code or cause a denial-of-service condition. The vulnerability occurs when the function attempts to access memory that has already been freed. By manipulating the timing of timer events, an attacker can trigger this use-after-free condition and potentially gain control over the system or disrupt network communication.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch provided in commit 5c2fe20ad37ff56070ae0acb34152333976929b4 manually. However, it is strongly advised to update to the latest version of the Linux Kernel to ensure comprehensive security fixes and avoid potential issues with manual patching.
Conclusion
The use-after-free vulnerability in the tw_timer_handler function of the net package in the Linux Kernel can have serious security implications. It is crucial to update to the latest version of the Linux Kernel to ensure the vulnerability is patched and to benefit from other security enhancements. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
This vulnerability can allow an attacker to execute arbitrary code or cause a denial-of-service condition.
By manipulating the timing of timer events, an attacker can trigger the use-after-free condition and potentially gain control over the system or disrupt network communication.
Yes, updating the Linux Kernel to version v4.14.261 or later will fix this vulnerability.
A manual patch can be applied, but it is recommended to update to the latest version of the Linux Kernel for comprehensive security fixes.
You can refer to the vulnerability details in the Open Source Vulnerability format provided by the Cloud Security Alliance's GSD database. The link to the details is available in the references section.
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