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Is it correct to assume that (prior to applying Security Update 2017-001) a host running macOS 10.12.6 (Sierra, i.e. not High Sierra) is not affected by the serious vulnerability that enables access to the root superuser if the following command returns non-empty ShadowHashData?

sudo plutil -p /var/db/dslocal/nodes/Default/users/root.plist
  • Would simply trying to log in as root (e.g. su) work? – SilverWolf Nov 29 '17 at 21:37
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According to Apple's support document on Security Update 2017-001 macOS Sierra 10.12.6 and earlier are not affected by the vulnerability:

Not impacted: macOS Sierra 10.12.6 and earlier

If you want to use terminal to find out if you're running 10.12.6 you may want to use the command

sw_vers -productVersion

or refer to the question How to find out Mac OS X version from Terminal? on superuser.

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