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CVE-2017-15274 : Exploit Details and Defense Strategies

Learn about CVE-2017-15274, a vulnerability in the Linux kernel keyctl system call that allows local users to trigger a denial of service. Find out how to mitigate this flaw and protect your system.

In the Linux kernel prior to version 4.11.5, a vulnerability exists in the keyctl system call functionality in the security/keys/keyctl.c file. This flaw allows local users to trigger a denial of service by exploiting a specific scenario, resulting in a NULL pointer dereference and OOPS condition.

Understanding CVE-2017-15274

This CVE entry highlights a vulnerability in the Linux kernel that can be exploited by local users to cause a denial of service.

What is CVE-2017-15274?

The vulnerability in the keyctl system call functionality in the Linux kernel arises from improper handling of a NULL payload combined with a non-zero length value. This flaw enables local users to exploit the system, leading to a denial of service.

The Impact of CVE-2017-15274

The vulnerability allows local users to trigger a denial of service, resulting in a NULL pointer dereference and OOPS condition. It is crucial to address this issue promptly to prevent system instability.

Technical Details of CVE-2017-15274

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in security/keys/keyctl.c in the Linux kernel before 4.11.5 allows local users to cause a denial of service via a crafted add_key or keyctl system call.

Affected Systems and Versions

        Affected systems: Linux kernel versions before 4.11.5
        Affected component: keyctl system call functionality

Exploitation Mechanism

The vulnerability can be exploited by local users through a specific scenario involving a NULL payload and a non-zero length value.

Mitigation and Prevention

Protecting systems from CVE-2017-15274 requires immediate actions 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 unusual activities that might indicate exploitation attempts.

Long-Term Security Practices

        Implement the principle of least privilege to restrict user access and actions on the system.
        Conduct regular security audits and assessments to identify and address potential vulnerabilities.

Patching and Updates

Regularly check for security advisories and updates from Linux kernel vendors to ensure that the system is protected against known vulnerabilities.

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