SB2021071907 - Multiple vulnerabilities in HashiCorp Consul

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Certificate Validation (CVE-ID: CVE-2021-32574)

CWE-ID: CWE-295 - Improper Certificate Validation

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

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.

2) Input validation error (CVE-ID: CVE-2021-36213)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• 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
• https://github.com/hashicorp/consul/releases/tag/v1.8.14