Bazaar through 2.7.0 when Subprocess SSH is used allows remote attackers to execute arbitrary commands via a bzr+ssh URL with an initial dash character in the hostname a related issue to CVE-2017-9800 CVE-2017-12836 CVE-2017-12976 CVE-2017-16228 CVE-2017-1000116 and CVE-2017-1000117.