#VU80034 Unchecked Return Value in Consul and Consul Enterprise - CVE-2022-40716

Vulnerability identifier: #VU80034

Vulnerability risk: Low

CVSSv4.0: 0.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-40716

CWE-ID: CWE-252

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 user to bypass implemented security restrictions.

The vulnerability exists due to an error when handling CSR requests at the RPC endpoint. A remote user with access to a client agent’s mTLS certificate and a valid ACL token for any service within the mesh can send a specially crafted certificate signing request (CSR) to the Consul’s internal RPC endpoint and bypass intended ACL token restrictions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Consul: 1.11.0 - 1.13.1

Consul Enterprise: 1.11.0 - 1.13.1

---

External links
https://discuss.hashicorp.com/t/hcsec-2022-20-consul-service-mesh-intention-bypass-with-malicious-certificate-signing-request/44628

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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