CVE-2021-37219 : Exploit Details and Defense Strategies
Learn about CVE-2021-37219 affecting HashiCorp Consul and Consul Enterprise, enabling privilege escalation through non-server agents. Mitigate risk with version upgrades and security best practices.
HashiCorp Consul and Consul Enterprise 1.10.1 Raft RPC layer allows non-server agents with a valid certificate signed by the same CA to access server-only functionality, enabling privilege escalation. Fixed in 1.8.15, 1.9.9 and 1.10.2.
Understanding CVE-2021-37219
This CVE affects HashiCorp Consul and Consul Enterprise versions 1.10.1 and below, posing a risk of privilege escalation through non-server agents.
What is CVE-2021-37219?
The vulnerability in the Raft RPC layer of HashiCorp Consul and Consul Enterprise versions 1.10.1 allows non-server agents to exploit a valid certificate signed by the same CA to gain unauthorized access to server-only functionality, thereby escalating privileges.
The Impact of CVE-2021-37219
The impact of this vulnerability is significant as it enables threat actors to elevate privileges within the Consul environment, potentially leading to unauthorized access and control over critical server functionalities.
Technical Details of CVE-2021-37219
This section provides detailed technical insights into the vulnerability.
Vulnerability Description
The vulnerability lies in the Raft RPC layer of HashiCorp Consul versions 1.10.1 and below, allowing unauthorized access to server-only functionalities.
Affected Systems and Versions
HashiCorp Consul and Consul Enterprise versions 1.10.1 are affected by this vulnerability. Users are advised to upgrade to versions 1.8.15, 1.9.9, or 1.10.2 to mitigate the risk.
Exploitation Mechanism
Non-server agents can exploit a valid certificate signed by the same CA to access server-only functionalities, leading to privilege escalation.
Mitigation and Prevention
To address CVE-2021-37219, immediate action and long-term security measures are crucial.
Immediate Steps to Take
Upgrade affected HashiCorp Consul and Consul Enterprise installations to versions 1.8.15, 1.9.9, or 1.10.2 to remediate the vulnerability.
Long-Term Security Practices
Implement secure certificate management practices and access controls to prevent unauthorized access and privilege escalation attempts.
Patching and Updates
Regularly monitor security advisories from HashiCorp and apply patches and updates promptly to protect against emerging threats.