USBNet: Sanity Check for Maxpacket Vulnerability in Linux Kernel
Summary
UVI-2021-1001942: usbnet: sanity check for maxpacket. Affects Kernel versions < 524f333e98138d909a0a0c574a9ff6737dce2767. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for the system, including device drivers, memory management, and process scheduling. The USBNet subsystem in the Linux Kernel enables USB devices to function as network interfaces, allowing data transfer over USB connections.
The USBNet subsystem relies on the 'maxpacket' parameter to determine the maximum packet size for USB transfers. However, a vulnerability has been discovered in the sanity check for this parameter, which could potentially lead to security issues.
Vulnerability Detail
The vulnerability in the USBNet subsystem arises from a lack of proper sanity checks for the 'maxpacket' parameter. This parameter is used to define the maximum packet size for USB transfers. Without adequate validation, an attacker could manipulate this parameter to cause buffer overflows, leading to potential memory corruption or arbitrary code execution.
Exploiting this vulnerability could allow an attacker to gain unauthorized access to the system, escalate privileges, or launch denial-of-service attacks. The impact and attack plausibility of this vulnerability have not been fully proven yet.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As a workaround, users can implement strict input validation and sanitization of the 'maxpacket' parameter in their USBNet configurations. By enforcing proper bounds checking and ensuring the parameter is within acceptable limits, the risk of exploitation can be mitigated. Here is an example of how to perform input validation in C code:
if (maxpacket < MIN_PACKET_SIZE || maxpacket > MAX_PACKET_SIZE) {
// Handle invalid 'maxpacket' value
}
Conclusion
The USBNet: Sanity Check for Maxpacket vulnerability in the Linux Kernel poses a potential security risk due to the lack of proper sanity checks for the 'maxpacket' parameter in the USBNet subsystem. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v4.9.289 or a later release. Regularly updating the Linux Kernel helps ensure that the latest security patches and bug fixes are applied. For further assistance or support in addressing this vulnerability, please contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The USBNet subsystem in the Linux Kernel allows USB devices to function as network interfaces, enabling data transfer over USB connections.
The 'maxpacket' parameter defines the maximum packet size for USB transfers in the USBNet subsystem.
The absence of proper sanity checks for the 'maxpacket' parameter allows attackers to manipulate it, potentially causing buffer overflows and leading to memory corruption or arbitrary code execution.
Exploiting this vulnerability could result in unauthorized access to the system, privilege escalation, or denial-of-service attacks.
No, the impact and attack plausibility of this vulnerability have not been fully demonstrated yet.
Related vulnerabilities
Recent vulnerabilities recorded for Kernel.
