CVE-2018-6558: Privilege Escalation in fscrypt

June 23, 2021

The pam_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and supplementary group IDs to the values associated with the root user, which allows attackers to gain privileges via a successful login through certain applications that use Linux-PAM (aka pam).

References

github.com/advisories/GHSA-qj26-7grj-whg3
github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91b
github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66
github.com/google/fscrypt/issues/77
nvd.nist.gov/vuln/detail/CVE-2018-6558

Code Behaviors & Features

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