CVE-2019-18282 : Vulnerability Insights and Analysis

A vulnerability in the flow_dissector feature in the Linux kernel versions 4.3 through 5.x prior to 5.3.10 allows for device tracking, posing a security risk.

Understanding CVE-2019-18282

This CVE identifies a specific vulnerability in the Linux kernel related to device tracking.

What is CVE-2019-18282?

The vulnerability, also known as CID-55667441c84f, is associated with the auto flowlabel of a UDP IPv6 packet in the Linux kernel. It stems from the use of a 32-bit hashrnd value as a secret and the utilization of jhash instead of siphash, making it susceptible to exploitation.

The Impact of CVE-2019-18282

The issue allows an attacker to deduce the hashrnd value, which remains constant from boot time, compromising the security of affected systems.

Technical Details of CVE-2019-18282

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability lies in the flow_dissector feature of the Linux kernel, specifically in the handling of the auto flowlabel of a UDP IPv6 packet.

Affected Systems and Versions

Linux kernel versions 4.3 through 5.x before 5.3.10
Code can be found in net/core/flow_dissector.c and related components

Exploitation Mechanism

Relies on a 32-bit hashrnd value as a secret
Uses jhash instead of siphash
Hashrnd value remains constant from boot time

Mitigation and Prevention

Protecting systems from CVE-2019-18282 is crucial for maintaining security.

Immediate Steps to Take

Apply relevant security patches promptly
Monitor for any unusual network activity
Implement network segmentation to limit the impact of potential attacks

Long-Term Security Practices

Regularly update and patch systems to address vulnerabilities
Conduct security audits and assessments to identify and mitigate risks

Patching and Updates

Update affected systems to Linux kernel version 5.3.10 or newer to mitigate the vulnerability