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.
https://www.debian.org/security/2017/dsa-4052
https://bugzilla.suse.com/show_bug.cgi?id=1058214
https://bugzilla.redhat.com/show_bug.cgi?id=1486685
https://bugs.launchpad.net/bzr/+bug/1710979
https://bugs.debian.org/874429
http://www.ubuntu.com/usn/usn-3411-1
http://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-14176.html