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CVE-2018-6558 : Security Advisory and Response

Learn about CVE-2018-6558, a security flaw in fscrypt versions prior to 0.2.4 allowing attackers to elevate privileges via Linux-PAM. Find mitigation steps and preventive measures here.

CVE-2018-6558 pertains to a vulnerability in the pam_fscrypt module in fscrypt versions before 0.2.4, allowing attackers to elevate privileges by logging in through specific applications using Linux-PAM.

Understanding CVE-2018-6558

This CVE entry highlights a security flaw in fscrypt that could lead to privilege escalation for attackers.

What is CVE-2018-6558?

The pam_fscrypt module in fscrypt versions prior to 0.2.4 incorrectly resets group IDs to root user values, enabling privilege escalation upon successful login via Linux-PAM.

The Impact of CVE-2018-6558

The vulnerability allows malicious actors to gain elevated privileges by exploiting the flawed group ID reset mechanism in fscrypt.

Technical Details of CVE-2018-6558

This section delves into the technical aspects of the CVE.

Vulnerability Description

The pam_fscrypt module in fscrypt before version 0.2.4 improperly restores primary and supplementary group IDs to root user values, facilitating privilege escalation through specific applications utilizing Linux-PAM.

Affected Systems and Versions

        Product: fscrypt
        Vendor: The fscrypt Project
        Versions affected: before 0.2.4

Exploitation Mechanism

Attackers can exploit this vulnerability by successfully logging in through certain applications that leverage Linux-PAM, taking advantage of the incorrect group ID restoration.

Mitigation and Prevention

Protective measures to address CVE-2018-6558.

Immediate Steps to Take

        Update fscrypt to version 0.2.4 or later to mitigate the vulnerability.
        Monitor system logs for any suspicious login activities.

Long-Term Security Practices

        Regularly review and update system components to prevent security loopholes.
        Implement least privilege access controls to limit potential damage from privilege escalation.

Patching and Updates

Apply patches and updates provided by the fscrypt Project to address the vulnerability effectively.

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