Missing Authorization in Consul Enterprise and Consul - CVE-2021-41803
Published: August 28, 2023
Vulnerability identifier: #VU80033
CSH Severity: Medium
CVSS v4: 7.1 [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]
CVE-ID: CVE-2021-41803
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Consul Enterprise
Consul
Fedora
moby-engine
Consul
Fedora
moby-engine
How to mitigate CVE-2021-41803
Install updates from vendor's website.
Consul Enterprise - addressed in versions 1.11.9, 1.12.5, 1.13.2
Consul - addressed in versions 1.11.9, 1.12.5, 1.13.2
moby-engine - addressed in versions 24.0.5-1.fc37, 24.0.5-1.fc38, 24.0.5-1.fc39
Consul - addressed in versions 1.11.9, 1.12.5, 1.13.2
moby-engine - addressed in versions 24.0.5-1.fc37, 24.0.5-1.fc38, 24.0.5-1.fc39