Missing Authorization in Consul and Consul Enterprise - CVE-2021-41803
Published: August 28, 2023
Vulnerability identifier: #VU80033
CSH Severity: Medium
CVSSv4.0: 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-2021-41803
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Consul
Consul Enterprise
Consul
Consul Enterprise
Software vendor:
HashiCorp
HashiCorp
Description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation when handling auto-config requests. A remote authenticated user can craft an auto-config request that allows the TLS certificate and ACL token to be generated for a node name not intended by the operator. This forces Consul to store unintended information, which can be repeatedly abused to cause an authenticated denial of service attack from a malicious operator.
Remediation
Install updates from vendor's website.