CVE-2017-5549 : Exploit Details and Defense Strategies

In the Linux kernel before version 4.9.5, a vulnerability exists in the klsi_105_get_line_state function in drivers/usb/serial/kl5kusb105.c. This flaw allows local users to access sensitive information by reading uninitialized heap-memory contents stored in a log entry.

Understanding CVE-2017-5549

This CVE entry highlights a security issue in the Linux kernel that could potentially lead to unauthorized access to sensitive data.

What is CVE-2017-5549?

The vulnerability in the klsi_105_get_line_state function allows local users to gain access to sensitive information by reading uninitialized heap-memory contents stored in a log entry.

The Impact of CVE-2017-5549

The security flaw in the Linux kernel could enable unauthorized users to retrieve sensitive data, posing a risk to system security and confidentiality.

Technical Details of CVE-2017-5549

This section provides detailed technical information about the CVE.

Vulnerability Description

The klsi_105_get_line_state function in drivers/usb/serial/kl5kusb105.c in the Linux kernel before 4.9.5 allows local users to obtain sensitive information by reading uninitialized heap-memory contents stored in a log entry.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

The vulnerability occurs when there is a failure to retrieve the line status, leading to uninitialized heap-memory contents being stored in a log entry, which can be exploited by local users to access sensitive information.

Mitigation and Prevention

Protecting systems from CVE-2017-5549 requires immediate actions and long-term security practices.

Immediate Steps to Take

Monitor security advisories from relevant vendors and apply patches promptly.
Restrict access to sensitive system logs to authorized personnel only.

Long-Term Security Practices

Implement the principle of least privilege to limit user access rights.
Regularly update and patch the Linux kernel to address known vulnerabilities.

Patching and Updates

Ensure that the Linux kernel is regularly updated to the latest version to mitigate the risk of exploitation of this vulnerability.