client_chown in the sync client in Synology Cloud Station 1.1-2291 through 3.1-3320 on OS X allows local users to change the ownership of arbitrary files, and consequently obtain root access, by specifying a filename.
http://www.kb.cert.org/vuls/id/BLUU-9VBU45
http://www.kb.cert.org/vuls/id/551972
http://www.securityfocus.com/bid/74826
Source: Mitre, NVD
Published: 2015-05-30
Updated: 2026-06-17
Base Score: 6.8
Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
Severity: Medium
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: High
EPSS: 0.00111