http_transport.c in Fossil before 2.4 when the SSH sync protocol is used allows user-assisted remote attackers to execute arbitrary commands via an ssh URL with an initial dash character in the hostname a related issue to CVE-2017-9800 CVE-2017-12836 CVE-2017-12976 CVE-2017-14176 CVE-2017-16228 CVE-2017-1000116 and CVE-2017-1000117.