Arch Linux: ASA-201708-17 Medium: Salt Directory Traversal Exploit

Arch Linux Security Advisory ASA-201708-17
=========================================
Severity: Medium
Date    : 2017-08-23
CVE-ID  : CVE-2017-12791
Package : salt
Type    : directory traversal
Remote  : Yes
Link    : https://security.archlinux.org/AVG-383

Summary
======
The package salt before version 2017.7.1-1 is vulnerable to directory
traversal.

Resolution
=========
Upgrade to 2017.7.1-1.

# pacman -Syu "salt>=2017.7.1-1"

The problem has been fixed upstream in version 2017.7.1.

Workaround
=========
None.

Description
==========
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.

Impact
=====
An unauthenticated attacker is able to craft a malicious minion ID to
cause a directory traversal on the salt-master.

References
=========
https://groups.google.com/forum/#!topic/salt-announce/3e5bNantdJk
https://security.archlinux.org/CVE-2017-12791