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CVE-2020-35513 : Security Advisory and Response

Learn about CVE-2020-35513, a flaw in Linux kernel NFS functionality allowing denial of service attacks. Find out affected systems, exploitation details, and mitigation steps.

A flaw in the Linux kernel NFS functionality could allow a user to cause denial of service by manipulating umask settings during file or directory modification.

Understanding CVE-2020-35513

This CVE involves a vulnerability in the Linux kernel NFS functionality that could be exploited to starve resources and lead to denial of service.

What is CVE-2020-35513?

        The vulnerability arises from incorrect umask settings during file or directory modification using NFSv4.2 or newer.
        Attackers can exploit this flaw when multiple processes access NFS simultaneously.

The Impact of CVE-2020-35513

        An attacker with access to NFS could exhaust resources, causing a denial of service condition.

Technical Details of CVE-2020-35513

This section provides detailed technical information about the vulnerability.

Vulnerability Description

        The flaw allows users to manipulate umask settings during file or directory modification in the Linux kernel NFS functionality.

Affected Systems and Versions

        Product: Kernel
        Vendor: Not applicable
        Versions affected: Before kernel 4.17-rc1

Exploitation Mechanism

        Attackers can exploit this vulnerability by simultaneously accessing NFS using NFSv4.2 or newer.

Mitigation and Prevention

Protecting systems from CVE-2020-35513 requires immediate actions and long-term security practices.

Immediate Steps to Take

        Apply relevant patches and updates to the affected systems.
        Monitor NFS activity for any suspicious behavior.

Long-Term Security Practices

        Implement strong access controls and permissions on NFS shares.
        Regularly review and update NFS configurations to adhere to security best practices.

Patching and Updates

        Regularly check for and apply kernel updates to address this vulnerability.

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