Use-after-free vulnerability in net: tw_timer_handler
Summary
GSD-2022-1000053: net: fix use-after-free in tw_timer_handler. Affects Kernel versions >= 61a7e26028b94805fd686a6dc9dbd9941f8f19b0, < 08eacbd141e2495d2fcdde84358a06c4f95cbb13. No fix is published. How to fix ↓
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Background
The net package is a crucial component of the Linux Kernel, responsible for handling network-related operations. It provides various functionalities such as socket management, packet processing, and network protocol implementations. The tw_timer_handler function within the net package is used for managing timer-based operations 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 tw_timer_handler arises when a timer is freed and subsequently accessed. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The vulnerability was introduced in version v2.6.27 of the Linux Kernel and has been fixed in version v5.15.13. The specific commit that addresses this issue is 08eacbd141e2495d2fcdde84358a06c4f95cbb13.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, if updating the Linux Kernel is not immediately feasible, it is recommended to implement strict network access controls and firewall rules to mitigate the risk of exploitation. Additionally, monitoring network traffic for any suspicious activity can help detect potential attacks targeting this vulnerability.
Conclusion
The use-after-free vulnerability in tw_timer_handler within the net package of the Linux Kernel can have severe security implications, potentially allowing arbitrary code execution or causing a denial-of-service (DoS) condition. It is crucial to update the Linux Kernel to version v5.15.13 or later to address this vulnerability. If you require further assistance or support in remediating this vulnerability, please reach out to DevNack.com.
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FAQ
The use-after-free vulnerability in tw_timer_handler can potentially allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze and alert you if the vulnerability is present.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to apply the fix promptly to prevent any potential exploitation.
Implementing strict network access controls and firewall rules can help mitigate the risk of exploitation. Additionally, monitoring network traffic for any suspicious activity can aid in detecting potential attacks targeting this vulnerability.
While updating the Linux Kernel is the recommended solution, implementing strict network access controls and firewall rules can provide temporary mitigation until the update can be applied.
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