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Ubuntu: (Multiple Advisories) (CVE-2018-6954): systemd regression

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Ubuntu: (Multiple Advisories) (CVE-2018-6954): systemd regression

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
02/13/2018
Created
03/19/2019
Added
11/15/2018
Modified
03/02/2020

Description

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.

Solution(s)

  • ubuntu-upgrade-systemd

References

  • USN-3816-1
  • USN-3816-2
  • USN-3816-3
  • CVE-2018-6954

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