CVE-2021-40862 in Terraform Enterprise
Summary
by MITRE • 09/16/2021
HashiCorp Terraform Enterprise up to v202108-1 contained an API endpoint that erroneously disclosed a sensitive URL to authenticated parties, which could be used for privilege escalation or unauthorized modification of a Terraform configuration. Fixed in v202109-1.
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Analysis
by VulDB Data Team • 09/19/2021
The vulnerability identified as CVE-2021-40862 represents a critical information disclosure flaw within HashiCorp Terraform Enterprise version 202108-1 and earlier releases. This security weakness manifested through an API endpoint that inadvertently exposed a sensitive URL to authenticated users, creating a significant vector for potential exploitation. The flaw occurred within the platform's access control mechanisms, where proper authorization checks failed to prevent legitimate users from accessing privileged resources that should have been restricted to administrators or specific roles within the organization's infrastructure management framework. The exposed URL likely provided access to internal system components or administrative functions that could be leveraged by malicious actors who gained legitimate authentication credentials through various means such as credential theft, social engineering, or compromised accounts.
The technical implementation of this vulnerability aligns with CWE-200, which describes information exposure through improper access control mechanisms. The flaw essentially created a backdoor pathway within the API architecture that bypassed normal authorization protocols, allowing authenticated users to discover and potentially utilize administrative endpoints that were not intended for general access. This type of vulnerability typically arises from insufficient input validation or inadequate privilege separation within the application's security model, where the system failed to properly verify the requesting user's authorization level before granting access to sensitive functionality. The exposed URL likely referenced internal endpoints that would normally be protected by strict access controls, but due to the flawed implementation, these resources became accessible to any authenticated user within the system, creating a significant escalation path for potential attackers.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it enabled privilege escalation capabilities that could lead to complete system compromise. An attacker who gained access to the exposed URL could potentially modify Terraform configurations, access sensitive infrastructure definitions, or manipulate deployment processes that control critical organizational infrastructure. This represents a serious threat to infrastructure as code security practices, as Terraform configurations often contain sensitive credentials, network configurations, and deployment instructions that could be exploited to gain unauthorized access to production environments. The vulnerability undermines the fundamental security assumptions of the platform, potentially allowing attackers to escalate their privileges from standard user accounts to administrative roles, thereby compromising the integrity and confidentiality of the entire infrastructure management system.
Organizations utilizing Terraform Enterprise versions prior to v202109-1 faced significant risk exposure from this vulnerability, as the flaw could be exploited by both internal and external threat actors who obtained legitimate authentication credentials. The fix implemented in version 202109-1 addresses the root cause by properly implementing access controls and ensuring that sensitive API endpoints are only accessible to authorized administrative users. Security teams should immediately assess their current deployment status and implement the necessary upgrade to the patched version to eliminate this exposure. The vulnerability also highlights the importance of regular security assessments and proper access control reviews within infrastructure management platforms, as the flaw could have been detected through routine penetration testing or security code reviews that would have identified the improper authorization checks. Organizations should also consider implementing additional monitoring controls to detect unusual API access patterns that might indicate exploitation attempts against similar information disclosure vulnerabilities.