netfilter: xt_IDLETIMER: Fix Panic When timer_type Has Garbage Value
Summary
GSD-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 netfilter package is a component of the Linux Kernel that provides firewalling and packet filtering capabilities. It allows administrators to define rules for network traffic and control the flow of packets. The xt_IDLETIMER module is a part of netfilter and is responsible for tracking idle connections and applying specific actions when a connection remains idle for a certain period of time. However, a vulnerability exists in the module that can lead to a panic when the timer_type parameter is set to a garbage value.
Vulnerability Detail
The vulnerability occurs in the xt_IDLETIMER module when an invalid or garbage value is provided for the timer_type parameter. This can trigger a panic in the Linux Kernel, resulting in a system crash. An attacker could potentially exploit this vulnerability by sending specially crafted network packets to a vulnerable system, causing a denial-of-service (DoS) condition. The impact of this vulnerability is limited to systems that have the xt_IDLETIMER module enabled and are using an affected version of the Linux Kernel.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is necessary to apply the provided fix by updating the Linux Kernel to a patched version.
Conclusion
The netfilter xt_IDLETIMER vulnerability can lead to a system crash and denial-of-service (DoS) condition on affected systems. It is crucial to update the Linux Kernel to a patched version to mitigate the risk associated with this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a system crash and denial-of-service (DoS) condition on systems with the xt_IDLETIMER module enabled and using an affected version of the Linux Kernel.
Yes, an attacker can exploit this vulnerability remotely by sending specially crafted network packets to a vulnerable system.
No, there is no known workaround. Updating the Linux Kernel to a patched version is the recommended solution.
The vulnerability was introduced in version v5.7 of the Linux Kernel and is fixed in version v5.10.76.
For more details about this vulnerability, you can refer to the source link provided in the database_specific section of the vulnerability details.
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