The package salt before version 2017.7.1-0.91 is vulnerable to directory traversal.
Upgrade to 2017.7.1-0.91.
# pacman -Syu "salt>=2017.7.1-0.91"
The problem has been fixed upstream in version 2017.7.1.
It has been discovered that maliciously crafted minion IDs can cause unwanted directory traversals on the salt-master. The flaw is within the minion id validation which could allow certain minions to authenticate to a master despite not having the correct credentials. To exploit the vulnerability, an attacker must create a salt-minion with an ID containing characters that will cause a directory traversal.
An unauthenticated attacker is able to craft a malicious minion ID to cause a directory traversal on the salt-master.