CVE-2017-10661 Explained : Impact and Mitigation

In the Linux kernel version prior to 4.10.15, a race condition in fs/timerfd.c can be exploited by local users to gain elevated privileges or disrupt system functionality.

Understanding CVE-2017-10661

This CVE involves a vulnerability in the Linux kernel that allows local users to exploit a race condition, potentially leading to privilege escalation or denial of service.

What is CVE-2017-10661?

The vulnerability in the Linux kernel version before 4.10.15 allows local users to gain elevated privileges or disrupt system functionality by exploiting a race condition in fs/timerfd.c. This occurs during simultaneous file-descriptor operations, taking advantage of improper queuing in the might_cancel execution.

The Impact of CVE-2017-10661

The consequences of this vulnerability include list corruption and the potential for use-after-free attacks, which can compromise system integrity and security.

Technical Details of CVE-2017-10661

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability allows local users to gain privileges or cause a denial of service through improper might_cancel queueing during simultaneous file-descriptor operations in fs/timerfd.c in the Linux kernel before version 4.10.15.

Affected Systems and Versions

Affected systems: Linux kernel versions before 4.10.15
Affected versions: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by local users through simultaneous file-descriptor operations, leveraging improper might_cancel queueing in fs/timerfd.c.

Mitigation and Prevention

Protecting systems from CVE-2017-10661 requires immediate steps and long-term security practices.

Immediate Steps to Take

Apply relevant patches and updates to the Linux kernel to mitigate the vulnerability.
Monitor system logs for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access and actions on the system.
Regularly update and patch the Linux kernel and other software components to address security vulnerabilities.

Patching and Updates

Update the Linux kernel to version 4.10.15 or later to eliminate the race condition vulnerability in fs/timerfd.c.