CVE-2019-19066 Explained : Impact and Mitigation

A memory leak vulnerability exists in the Linux kernel, specifically in the bfad_im_get_stats() function in drivers/scsi/bfa/bfad_attr.c. Attackers can exploit this flaw in versions up to 5.3.11 to cause a denial of service by triggering failures in bfa_port_get_stats().

Understanding CVE-2019-19066

This CVE involves a memory leak vulnerability in the Linux kernel that can lead to a denial of service attack.

What is CVE-2019-19066?

The vulnerability is located in the bfad_im_get_stats() function in the Linux kernel, allowing attackers to consume memory and cause a denial of service by inducing failures in bfa_port_get_stats(). It has been identified as CID-0e62395da2bd.

The Impact of CVE-2019-19066

The vulnerability can be exploited by malicious actors to trigger failures in specific functions, leading to excessive memory consumption and ultimately causing a denial of service condition on affected systems.

Technical Details of CVE-2019-19066

This section provides technical details about the vulnerability.

Vulnerability Description

The memory leak vulnerability in the bfad_im_get_stats() function in drivers/scsi/bfa/bfad_attr.c in the Linux kernel up to version 5.3.11 allows attackers to initiate a denial of service attack by causing failures in bfa_port_get_stats().

Affected Systems and Versions

The vulnerability affects Linux kernel versions up to 5.3.11.

Exploitation Mechanism

Attackers can exploit this vulnerability by intentionally triggering failures in the bfa_port_get_stats() function, leading to memory leaks and a denial of service condition.

Mitigation and Prevention

Protecting systems from CVE-2019-19066 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers to mitigate the vulnerability.
Monitor system resources for any signs of abnormal memory consumption.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
Implement proper access controls and network segmentation to reduce the attack surface.

Patching and Updates

Stay informed about security advisories and updates from Linux distributions and vendors to promptly address any new vulnerabilities.