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Advisories

util-linux libmount Privilege Escalation via Failed Mount Helper

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severity
high
date
Affecting

  • util-linux >= 2.39, < 2.41.6

  • util-linux >= 2.42, < 2.42.3

CWE
  • CWE-390 Detection of Error Condition Without Action
CVSS
8.5
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Andreas Gabriel Berbescu, Ivan Redondo Plaza
Description
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.

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