CVE-2021-27099 : Exploit Details and Defense Strategies
Learn about CVE-2021-27099 impacting SPIRE Node Attestor before versions 0.8.5 to 0.12.1. Explore its impact, technical details, and mitigation strategies to secure systems.
SPIRE before versions 0.8.5, 0.9.4, 0.10.2, 0.11.3, and 0.12.1 is affected by a vulnerability in the "aws_iid" Node Attestor. This flaw allows the issuance of an arbitrary SPIFFE ID within the same trust domain under specific conditions. Learn more about the impact, technical details, and mitigation strategies associated with CVE-2021-27099.
Understanding CVE-2021-27099
This section delves into the significance of the vulnerability and its implications.
What is CVE-2021-27099?
In SPIRE versions prior to 0.8.5, 0.9.4, 0.10.2, 0.11.3, and 0.12.1, a security issue arises in the "aws_iid" Node Attestor due to improper path normalization. This could enable the generation of a malicious SPIFFE ID within the same trust domain.
The Impact of CVE-2021-27099
The vulnerability could potentially allow threat actors to manipulate EC2 tag values and orchestrate the creation of unauthorized SPIFFE IDs, compromising the trust domain's security.
Technical Details of CVE-2021-27099
Explore the specifics of the vulnerability and its technical aspects.
Vulnerability Description
The flaw lies in how the "aws_iid" Node Attestor handles path normalization, granting attackers control over EC2 tag values for unauthorized SPIFFE ID issuance.
Affected Systems and Versions
SPIRE versions 0.8.5, 0.9.4, 0.10.2, 0.11.3, and 0.12.1 are impacted by this vulnerability, highlighting the importance of timely updates.
Exploitation Mechanism
By manipulating the agent ID templating feature, threat actors can exploit the vulnerability to generate arbitrary SPIFFE IDs within the trust domain.
Mitigation and Prevention
Discover the steps to secure your systems against CVE-2021-27099.
Immediate Steps to Take
It is essential to update SPIRE to versions 0.11.3 or 0.12.1 to mitigate the vulnerability and prevent unauthorized SPIFFE ID issuance.
Long-Term Security Practices
Implement robust security measures to restrict access and prevent unauthorized modifications to EC2 tag values, enhancing overall system security.
Patching and Updates
Regularly monitor for security patches and updates for SPIRE to address vulnerabilities and enhance the platform's resilience.