usbnet: Sanity Check for maxpacket
Summary
GSD-2021-1002190: usbnet: sanity check for maxpacket. Affects Kernel versions < 397430b50a363d8b7bdda00522123f82df6adc5e. No fix is published. How to fix ↓
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Background
The usbnet package is a Linux kernel module that provides a driver for USB network devices. It allows USB devices to act as network interfaces, enabling communication between the device and the host system. The usbnet module is responsible for managing the USB-specific aspects of the network device.
The vulnerability in usbnet arises from a missing sanity check for the maxpacket value. This value represents the maximum packet size that can be transferred over the USB interface. Without proper validation, an attacker could manipulate the maxpacket value to cause a buffer overflow or other memory-related issues.
Vulnerability Detail
The vulnerability in usbnet arises from a missing sanity check for the maxpacket value. When a USB network device is initialized, the usbnet module reads the maxpacket value from the device descriptor. However, it fails to perform a sanity check on this value, assuming it to be valid. This oversight can be exploited by an attacker who can modify the device descriptor to provide an invalid or malicious maxpacket value.
By providing a large or invalid maxpacket value, an attacker can trigger a buffer overflow or other memory-related issues. This can lead to arbitrary code execution, denial of service, or other security compromises. The impact and attack plausibility of this vulnerability have not been proven, but it is considered a potential security risk.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the use of USB network devices or restrict their usage to trusted devices only. This can be done by blacklisting the usbnet module or configuring the system to ignore USB network devices. However, this workaround may not be feasible in all scenarios and may limit the functionality of USB devices.
Conclusion
The usbnet package in the Linux Kernel is vulnerable to a missing sanity check for the maxpacket value. This can be exploited by an attacker to trigger memory-related issues. It is recommended to update the Linux Kernel to version v5.15 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
usbnet is a Linux kernel module that provides a driver for USB network devices. It allows USB devices to act as network interfaces, enabling communication between the device and the host system.
The maxpacket value represents the maximum packet size that can be transferred over the USB interface. It is read from the device descriptor during initialization.
By manipulating the maxpacket value in the device descriptor, an attacker can trigger a buffer overflow or other memory-related issues, potentially leading to arbitrary code execution or denial of service.
The impact and attack plausibility of this vulnerability have not been proven. However, it is considered a potential security risk.
To fix the vulnerability, users should update their Linux Kernel to version v5.15 or later. This can be done by downloading the updated kernel source code from the official Linux Kernel repository and compiling it according to the provided instructions.
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