CVE-2017-16649 : Exploit Details and Defense Strategies

The function usbnet_generic_cdc_bind in the Linux kernel, specifically in the cdc_ether.c file located in the drivers/net/usb directory, enables local users to provoke a denial of service (causing a divide-by-zero error and crashing the system) or potentially have other unspecified effects by employing a manipulated USB device.

Understanding CVE-2017-16649

This CVE entry describes a vulnerability in the Linux kernel that allows local users to cause a denial of service or potentially have other impacts through a crafted USB device.

What is CVE-2017-16649?

The usbnet_generic_cdc_bind function in the Linux kernel through version 4.13.11 allows local users to cause a denial of service (divide-by-zero error and system crash) or possibly have unspecified other impacts via a crafted USB device.

The Impact of CVE-2017-16649

Local users can trigger a denial of service by exploiting this vulnerability, leading to a system crash.
The manipulation of a USB device can have unspecified effects on the system.

Technical Details of CVE-2017-16649

This section provides more in-depth technical details about the CVE.

Vulnerability Description

The usbnet_generic_cdc_bind function in drivers/net/usb/cdc_ether.c in the Linux kernel allows local users to cause a denial of service or potentially have other impacts via a crafted USB device.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by local users through a manipulated USB device, causing a divide-by-zero error and potentially crashing the system.

Mitigation and Prevention

Protecting systems from CVE-2017-16649 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant security patches provided by the Linux kernel or distribution vendors.
Monitor and restrict USB device usage to trusted sources.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement least privilege access controls to limit the impact of potential vulnerabilities.
Conduct regular security audits and vulnerability assessments.

Patching and Updates

Stay informed about security advisories from Linux kernel and distribution vendors.
Promptly apply patches and updates to address known vulnerabilities.