CVE-2019-5489 : Exploit Details and Defense Strategies

The mincore() function in the Linux kernel through version 4.19.13 had a vulnerability that could be exploited by local attackers to monitor the page cache access patterns of other processes on the same system, potentially leading to the unauthorized interception of confidential information.

Understanding CVE-2019-5489

This CVE entry describes a security vulnerability in the Linux kernel that could allow local attackers to observe page cache access patterns of other processes, potentially leading to data interception.

What is CVE-2019-5489?

The mincore() function in the Linux kernel through version 4.19.13 had a vulnerability that could be exploited by local attackers to monitor the page cache access patterns of other processes on the same system. This could potentially lead to the unauthorized interception of confidential information.

The Impact of CVE-2019-5489

Local attackers could monitor page cache access patterns of other processes on the same system
Potential unauthorized interception of confidential information
Limited remote exploitation may be possible

Technical Details of CVE-2019-5489

This section provides more technical insights into the vulnerability.

Vulnerability Description

The mincore() function in the Linux kernel through 4.19.13 allowed local attackers to observe page cache access patterns of other processes on the same system, potentially allowing sniffing of secret information. Limited remote exploitation may be possible.

Affected Systems and Versions

Affected versions: Linux kernel through 4.19.13
The vulnerability impacts systems running affected versions of the Linux kernel

Exploitation Mechanism

Local attackers can exploit the vulnerability to monitor page cache access patterns of other processes
Limited remote exploitation may be possible, as demonstrated by latency differences in accessing public files from an Apache HTTP Server

Mitigation and Prevention

Protecting systems from CVE-2019-5489 requires immediate action and long-term security practices.

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers
Monitor for any unusual activity on the system
Restrict access to sensitive information

Long-Term Security Practices

Regularly update the Linux kernel to the latest version
Implement strong access controls and permissions on the system
Conduct regular security audits and vulnerability assessments
Educate users on best security practices

Patching and Updates

Stay informed about security updates from the Linux kernel maintainers
Apply patches promptly to mitigate the vulnerability