Improper access control in makandra consul

1) Improper access control

EUVDB-ID: #VU21292

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16377

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to certain controller actions.

The vulnerability exists in the consul gem for Ruby on Rails when processing multiple power directives. As a result, the ":only" and ":except" options of the last directive apply to all previous directives. A remote attacker can gain unauthenticated access to certain controller actions.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

consul: 0.1.0 - 1.0.2

External links

http://github.com/makandra/consul/issues/49
http://rubygems.org/gems/consul

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.