CVE-2011-3145: mount.ecrpytfs_private sets group owner of /etc/mtab to user's primary group

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-04-22 · updated 2026-06-16
Weakness: CWE-254

Description

When mount.ecrpytfs_private before version 87-0ubuntu1.2 calls setreuid() it doesn't also set the effective group id. So when it creates the new version, mtab.tmp, it's created with the group id of the user running mount.ecryptfs_private.

Affected products

Mount.Ecrpytfs Private Project Mount.Ecrpytfs Private: all versions

References

http://bazaar.launchpad.net/~ecryptfs/ecryptfs/trunk/revision/558
http://bazaar.launchpad.net/~ecryptfs/ecryptfs/trunk/revision/558

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