Use-after-free vulnerability in atm: nicstar
Summary
UVI-2021-1001490: atm: nicstar: Fix possible use-after-free in nicstar_cleanup(). Affects Kernel versions < 99779c9d9ffc7775da6f7fd8a7c93ac61657bed5. No fix is published. How to fix ↓
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Background
The atm: nicstar package is a component of the Linux Kernel, which is responsible for handling Asynchronous Transfer Mode (ATM) network interfaces. It provides support for NICStAR-based ATM cards. These cards are used to connect computers to ATM networks, enabling high-speed data transfer. The nicstar_cleanup() function in the package is susceptible to a use-after-free vulnerability.
Vulnerability Detail
The use-after-free vulnerability in atm: nicstar arises from improper memory management in the nicstar_cleanup() function. This vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial-of-service condition. The vulnerability can be triggered when the function attempts to free a previously allocated memory block that has already been freed. By manipulating the memory state, an attacker can potentially gain control over the execution flow of the program.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the Linux Kernel, there is no specific workaround available. However, users who are unable to immediately update their kernel can mitigate the risk by implementing other security measures, such as network segmentation, access controls, and intrusion detection systems.
Conclusion
The use-after-free vulnerability in atm: nicstar can be mitigated by updating the Linux Kernel to a version that includes the necessary patch. It is crucial to promptly apply the fix to prevent potential exploitation of this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
atm: nicstar is a component of the Linux Kernel that provides support for NICStAR-based ATM cards, enabling high-speed data transfer over ATM networks.
A use-after-free vulnerability occurs when a program attempts to access memory that has already been freed. This can lead to unpredictable behavior, including crashes, data corruption, and potential code execution by an attacker.
This vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service condition on a system running the vulnerable version of atm: nicstar.
To fix this vulnerability, update the Linux Kernel to version v4.4.276 or later, which includes the necessary patch to address the use-after-free vulnerability.
While there are no specific workarounds for this vulnerability, implementing additional security measures such as network segmentation, access controls, and intrusion detection systems can help mitigate the risk.
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