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/551972
- http://www.kb.cert.org/vuls/id/BLUU-9VBU45
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