The default configuration for salt-ssh in Salt (aka SaltStack) 0.17.0 does not validate the SSH host key of requests, which allows remote attackers to have unspecified impact via a man-in-the-middle (MITM) attack.
The salt master in Salt (aka SaltStack) 0.11.0 through 0.17.0 does not properly drop group privileges, which makes it easier for remote attackers to gain privileges.