Access Restriction Bypass

Affecting systemd package, versions <229-4ubuntu21.15

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Overview

systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.

References

CVSS Score

7.8
medium severity
  • Attack Vector
    Local
  • Attack Complexity
    Low
  • Privileges Required
    Low
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    High
  • Availability
    High
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVE
CVE-2018-6954
Snyk ID
SNYK-UBUNTU1604-SYSTEMD-305047
Disclosed
13 Feb, 2018
Published
13 Feb, 2018