CVE-2019-18807 : Vulnerability Insights and Analysis

The Linux kernel prior to version 5.3.5 has two instances of memory leaks in the sja1105_static_config_upload() function that can be exploited by attackers to cause a denial of service by consuming excessive memory.

Understanding CVE-2019-18807

This CVE identifies memory leaks in the Linux kernel that can lead to a denial of service attack.

What is CVE-2019-18807?

CVE-2019-18807 refers to two memory leaks in the sja1105_static_config_upload() function in the Linux kernel before version 5.3.5. Attackers can trigger these memory leaks to cause a denial of service by consuming excessive memory.

The Impact of CVE-2019-18807

The vulnerability allows attackers to exploit memory leaks, leading to a denial of service condition by consuming excessive memory. This can be achieved by causing failures in specific functions within the kernel.

Technical Details of CVE-2019-18807

This section provides detailed technical information about the CVE.

Vulnerability Description

The memory leaks in the sja1105_static_config_upload() function in the Linux kernel before version 5.3.5 can be exploited by attackers to trigger denial of service attacks by consuming excessive memory.

Affected Systems and Versions

Affected System: Linux kernel before version 5.3.5
Affected Function: sja1105_static_config_upload()

Exploitation Mechanism

Attackers can exploit the memory leaks by causing failures in the static_config_buf_prepare_for_upload() or sja1105_inhibit_tx() functions, leading to a denial of service condition.

Mitigation and Prevention

Protecting systems from CVE-2019-18807 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the Linux kernel to version 5.3.5 or newer to mitigate the memory leaks.
Monitor system memory consumption for any unusual spikes that could indicate an ongoing attack.

Long-Term Security Practices

Implement regular security patches and updates to address vulnerabilities promptly.
Conduct regular security audits and assessments to identify and mitigate potential risks.

Patching and Updates

Apply patches provided by the Linux kernel maintainers to fix the memory leaks and prevent denial of service attacks.