Denial of service in HashiCorp Consul

1) Input validation error

EUVDB-ID: #VU80038

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-0845

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote user with service:write permissions can configure the upstreams to reference a peering destination and crash the Consul server or client agent hosting the xDS connection to an API gateway or ingress gateway.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Consul: 1.14.0 - 1.14.4

Consul Enterprise: 1.14.0 - 1.14.4

CPE2.3

• cpe:2.3:a:hashicorp:consul:1.14.0:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul:1.14.1:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul:1.14.2:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul:1.14.3:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul:1.14.4:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul_enterprise:1.14.0:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul_enterprise:1.14.1:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul_enterprise:1.14.2:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul_enterprise:1.14.3:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:consul_enterprise:1.14.4:*:*:*:*:*:*:*

External links

https://discuss.hashicorp.com/t/hcsec-2023-06-consul-server-panic-when-ingress-and-api-gateways-configured-with-peering-connections/51197

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.