netfilter: xt_IDLETIMER: Fix Panic in Linux Kernel
Summary
UVI-2021-1001851: netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value. Affects Kernel versions >= 68983a354a655c35d3fb204489d383a2a051fda7, < 2a670c323055282c9b72794a491d53cef86bbeaf. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system. It provides essential services and functions to enable the proper functioning of the system. The netfilter subsystem in the Linux Kernel is responsible for packet filtering, network address translation, and port forwarding. The xt_IDLETIMER module is a part of netfilter and allows users to match packets based on their idle time. However, a vulnerability has been discovered in the xt_IDLETIMER module that can lead to a panic in the kernel when the timer_type parameter has a garbage value.
Vulnerability Detail
The vulnerability in the xt_IDLETIMER module arises when the timer_type parameter is set to a garbage value. This can cause the kernel to panic, resulting in a system crash. An attacker with local access to the system may be able to exploit this vulnerability to cause a denial-of-service (DoS) condition. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Linux Kernel version v5.7 and has been fixed in version v5.10.76.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, users can mitigate the risk by ensuring that only trusted users have local access to the system. Additionally, implementing proper access controls and monitoring mechanisms can help detect and prevent potential exploitation of this vulnerability.
Conclusion
The xt_IDLETIMER vulnerability in the Linux Kernel can lead to a kernel panic and system crash when the timer_type parameter has a garbage value. It is important to update the kernel to version v5.10.76 or later to mitigate this vulnerability. Regularly updating the kernel and implementing proper access controls can help maintain the security of the system. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a kernel panic and system crash, resulting in a denial-of-service (DoS) condition.
An attacker with local access to the system can set the timer_type parameter to a garbage value, triggering the vulnerability and causing a kernel panic.
There is no information available regarding active exploitation of this vulnerability at the time of this report.
Yes, the vulnerability has been fixed in Linux Kernel version v5.10.76. Users are advised to update their kernel to this version or later.
Yes, the vulnerability was introduced in Linux Kernel version v5.7. Users running older versions should update to a fixed version.
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