CVE-2018-6558 Affecting fscrypt package, versions <0.2.4-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-FSCRYPT-1546466
- published25 Sept 2018
- disclosed23 Aug 2018
Introduced: 23 Aug 2018
CVE-2018-6558 (opens in a new tab)How to fix?
Upgrade Debian:12 fscrypt to version 0.2.4-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream fscrypt package and not the fscrypt package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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
- https://security-tracker.debian.org/tracker/CVE-2018-6558
- 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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-6558