#VU54947 Input validation error in Consul and Consul Enterprise - CVE-2021-36213

Vulnerability identifier: #VU54947

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-36213

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Consul
Server applications / Other server solutions
Consul Enterprise
Server applications / Other server solutions

Vendor: HashiCorp

Description

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

The vulnerability exists due to the xds can generate a situation where a single L7 deny intention (with a default deny policy) results in an allow action.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Consul: 1.9.0 - 1.9.7, 1.10.0

Consul Enterprise: 1.9.0 - 1.9.8, 1.10.0

---

External links
https://www.hashicorp.com/blog/category/consul
https://github.com/hashicorp/consul/releases/tag/v1.10.1
https://github.com/hashicorp/consul/releases/tag/v1.9.8

---

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.