Multiple vulnerabilities in HashiCorp Consul

Published: 2021-07-19

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-32574 CVE-2021-36213
CWE-ID	CWE-295 CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Consul Server applications / Other server solutions Consul Enterprise Server applications / Other server solutions
Vendor	HashiCorp

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Certificate Validation

EUVDB-ID: #VU54946

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32574

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to xds does not ensure that the Subject Alternative Name of an upstream is validated. A remote attacker can perform a man-in-the-middle (MitM) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Consul: 1.8.0 - 1.10.0

External links

http://www.hashicorp.com/blog/category/consul
http://github.com/hashicorp/consul/releases/tag/v1.10.1
http://github.com/hashicorp/consul/releases/tag/v1.9.8
http://github.com/hashicorp/consul/releases/tag/v1.8.14

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.

2) Input validation error

EUVDB-ID: #VU54947

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-36213

CWE-ID: CWE-20 - Improper input validation