CVE-2019-10638 : Security Advisory and Response

A vulnerability in the Linux kernel before version 5.1.7 allows attackers to track devices by exploiting IP ID values. This can be achieved through hash collisions in counter array indices, revealing the hashing key.

Understanding CVE-2019-10638

This CVE involves a security issue in the Linux kernel that can be exploited to track devices by manipulating IP ID values.

What is CVE-2019-10638?

Prior to version 5.1.7 of the Linux kernel, attackers can track devices by exploiting IP ID values generated by the kernel for connection-less protocols like UDP and ICMP. By inducing hash collisions in counter array indices, attackers can reveal the hashing key through enumeration.

The Impact of CVE-2019-10638

This vulnerability allows attackers to track devices by manipulating IP ID values, potentially compromising user privacy and security.

Technical Details of CVE-2019-10638

This section provides detailed technical information about the CVE.

Vulnerability Description

The Linux kernel before version 5.1.7 allows attackers to track devices by exploiting IP ID values generated for connection-less protocols like UDP and ICMP. Hash collisions in counter array indices can reveal the hashing key.

Affected Systems and Versions

Affected systems: Linux kernel versions before 5.1.7
Affected protocols: UDP, ICMP

Exploitation Mechanism

Attackers can host a malicious webpage using WebRTC or gQUIC to direct UDP traffic towards IP addresses controlled by the attacker, exploiting hash collisions to track devices.

Mitigation and Prevention

Learn how to mitigate and prevent the exploitation of CVE-2019-10638.

Immediate Steps to Take

Update to Linux kernel version 5.1.7 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious activities that could indicate exploitation of this vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel and other software components to patch known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Apply security patches provided by Linux distributions to address CVE-2019-10638.
Stay informed about security advisories and updates from relevant vendors to protect against emerging threats.