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
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
Long-Term Security Practices
Patching and Updates
Apply patches and updates provided by the fscrypt Project to address the vulnerability effectively.