CVE-2018-20169 : Exploit Details and Defense Strategies

A problem was identified in the Linux kernel prior to version 4.19.9. The USB system incorrectly handles size verifications while reading an additional descriptor, specifically in the __usb_get_extra_descriptor function located in drivers/usb/core/usb.c.

Understanding CVE-2018-20169

What is CVE-2018-20169?

An issue was discovered in the Linux kernel before version 4.19.9. The USB subsystem mishandles size checks during the reading of an extra descriptor, related to __usb_get_extra_descriptor in drivers/usb/core/usb.c.

The Impact of CVE-2018-20169

This vulnerability could allow a remote attacker to cause a denial of service (DoS) or potentially execute arbitrary code on the target system.

Technical Details of CVE-2018-20169

Vulnerability Description

The USB subsystem in the Linux kernel mishandles size checks during the reading of an extra descriptor, specifically in the __usb_get_extra_descriptor function.

Affected Systems and Versions

Affected systems running Linux kernel versions prior to 4.19.9

Exploitation Mechanism

The vulnerability can be exploited by a remote attacker sending specially crafted USB packets to the target system, leading to a DoS condition or potential code execution.

Mitigation and Prevention

Immediate Steps to Take

Apply the necessary security patches provided by the Linux kernel maintainers.
Monitor vendor advisories and update systems promptly.

Long-Term Security Practices

Regularly update and patch all software and systems to mitigate potential vulnerabilities.
Implement network security measures to prevent unauthorized access to critical systems.

Patching and Updates

Ensure that the Linux kernel is updated to version 4.19.9 or later to address this vulnerability.