CVE-2018-6954 Information

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html https://github.com/systemd/systemd/issues/7986 https://usn.ubuntu.com/3816-1/ https://usn.ubuntu.com/3816-2/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8