CVE-2024-56802 in tapir
Summary
by MITRE • 12/31/2024
Tapir is a private Terraform registry. Tapir versions 0.9.0 and 0.9.1 are facing a critical issue with scope-able Deploykeys where attackers can guess the key to get write access to the registry. User must upgrade to 0.9.2.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 12/31/2024
The Tapir private Terraform registry vulnerability CVE-2024-56802 represents a critical security flaw in versions 0.9.0 and 0.9.1 that directly impacts the integrity and confidentiality of infrastructure-as-code deployments. This vulnerability specifically targets the Deploykeys functionality, which serves as a critical access control mechanism for registry operations. The issue stems from insufficient randomness and predictability in the key generation algorithm, allowing malicious actors to enumerate valid deployment keys through brute force or pattern recognition techniques. The vulnerability aligns with CWE-330, which addresses the use of insufficiently random values in security-critical contexts, and represents a direct violation of the principle of least privilege in access control systems.
The technical implementation flaw manifests in how Tapir generates and manages deploykeys for scope-able registry access. When users create deployment keys for specific registry scopes, the system fails to generate sufficiently cryptographically secure random values that would prevent attackers from predicting valid key combinations. This weakness enables unauthorized users to systematically guess valid keys through automated tools or by analyzing patterns in key generation. The vulnerability is particularly dangerous because it allows attackers to gain write access to the registry, potentially enabling them to publish malicious modules, modify existing components, or inject backdoors into the infrastructure provisioning pipeline. This represents a critical compromise of the supply chain security model that Terraform registries are designed to protect.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it fundamentally undermines the trust model of private registry deployments. Attackers who successfully exploit this vulnerability can modify or replace legitimate Terraform modules with malicious versions, potentially affecting numerous downstream deployments across organizations that depend on these registry components. The write access capability means that attackers can not only read registry contents but also alter the registry state, leading to potential service disruption, data corruption, or complete compromise of infrastructure provisioning processes. This vulnerability particularly affects DevOps teams and security operations that rely on private registries for managing trusted module distributions, creating a significant risk to continuous integration and deployment pipelines that depend on these systems.
Organizations affected by CVE-2024-56802 must immediately implement the recommended mitigation by upgrading to Tapir version 0.9.2, which contains the necessary cryptographic improvements to address the predictable key generation issue. The upgrade process should include thorough testing to ensure that existing deployment keys remain functional while the new version provides proper entropy in key generation. Security teams should also conduct immediate audits of their registry access controls, revoke and regenerate any potentially compromised keys, and implement monitoring for unauthorized access attempts. This vulnerability demonstrates the critical importance of proper random number generation in security systems and aligns with ATT&CK technique T1555.004, which covers credentials from password storage, highlighting the need for robust cryptographic implementations in access control mechanisms. Organizations should also consider implementing additional security controls such as key rotation policies, multi-factor authentication for registry access, and network segmentation to limit the potential impact of credential compromise in similar future vulnerabilities.