CVE-2018-6558
First published: Thu Aug 23 2018(Updated: )
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).
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Google Fscrypt | <0.2.4 | |
| go/github.com/google/fscrypt | <0.2.4 | 0.2.4 |
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Reference Links
- https://github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91b
- https://github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66
- https://github.com/google/fscrypt/issues/77
- https://launchpad.net/bugs/1787548
- https://nvd.nist.gov/vuln/detail/CVE-2018-6558
- https://pkg.go.dev/vuln/GO-2020-0027
- https://github.com/advisories/GHSA-qj26-7grj-whg3 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2018-6558?
CVE-2018-6558 has a high severity rating due to the potential privilege escalation it allows.
How do I fix CVE-2018-6558?
To fix CVE-2018-6558, upgrade the fscrypt module to version 0.2.4 or later.
What applications are affected by CVE-2018-6558?
CVE-2018-6558 affects applications that use Linux-PAM for authentication.
What can an attacker do with CVE-2018-6558?
An attacker can gain elevated privileges through a successful login due to incorrect restoration of group IDs.
Who is responsible for the CVE-2018-6558 vulnerability?
The CVE-2018-6558 vulnerability is associated with the pam_fscrypt module developed by Google.
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