CVE-2024-28174 in TeamCity
Summary
by MITRE • 03/06/2024
In JetBrains TeamCity before 2023.11.4 presigned URL generation requests in S3 Artifact Storage plugin were authorized improperly
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Analysis
by VulDB Data Team • 12/16/2024
The vulnerability identified as CVE-2024-28174 affects JetBrains TeamCity versions prior to 2023.11.4 and specifically targets the S3 Artifact Storage plugin implementation. This issue stems from improper authorization mechanisms during presigned URL generation requests, creating a security gap that could allow unauthorized access to stored artifacts. The flaw exists within the plugin's handling of Amazon S3 storage operations where presigned URLs are generated to provide temporary access to artifacts stored in S3 buckets. The improper authorization logic means that certain requests may bypass expected access controls, potentially enabling malicious actors to obtain access to artifacts they should not be permitted to retrieve.
The technical implementation of this vulnerability involves the S3 Artifact Storage plugin's failure to properly validate authentication and authorization contexts when generating presigned URLs for artifact access. Presigned URLs are typically used to provide temporary access to S3 objects without requiring ongoing authentication, but in this case the authorization checks are insufficient. The flaw likely occurs during the URL generation process where the plugin does not adequately verify user permissions or session contexts before creating access tokens. This misconfiguration creates a path where unauthorized users might be able to generate or access presigned URLs that grant them access to artifacts they should not be able to retrieve based on their assigned permissions or roles.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially exposing sensitive build artifacts, configuration files, source code, or other proprietary information stored within TeamCity's S3 repositories. Attackers could exploit this weakness to gain access to artifacts that contain intellectual property, sensitive configuration data, or other confidential information that builds or deployments rely upon. The vulnerability particularly affects organizations that store critical build outputs, deployment artifacts, or sensitive data within S3 buckets managed through TeamCity's artifact storage functionality. The implications are significant for environments where TeamCity serves as a central build and deployment system, as compromised access could potentially lead to broader supply chain attacks or data exfiltration scenarios.
Organizations should immediately upgrade to TeamCity version 2023.11.4 or later to address this vulnerability, as this release includes the necessary authorization fixes for the S3 Artifact Storage plugin. Additional mitigations include implementing network-level controls to restrict access to TeamCity's S3 storage endpoints, monitoring for unusual presigned URL generation activities, and reviewing existing S3 bucket policies to ensure proper access controls are in place. Security teams should also conduct thorough audits of their TeamCity configurations to identify any other potential authorization gaps and implement principle of least privilege controls for all S3 access. The vulnerability aligns with CWE-284 which addresses improper access control in software systems, and could potentially be leveraged as part of broader attack chains targeting CI/CD pipeline security as documented in ATT&CK technique T1505.003 for server-side request forgery or T1078 for valid accounts usage in enterprise environments.
This vulnerability demonstrates the critical importance of proper authorization validation in cloud storage integrations within CI/CD platforms, where the combination of temporary access tokens and inadequate permission checking can create persistent security risks. Organizations relying on TeamCity for automated build and deployment processes must ensure that all plugin components receive regular security updates and that proper access controls are maintained for cloud storage integrations. The fix implemented in TeamCity 2023.11.4 addresses the root cause by strengthening the authorization validation process during presigned URL generation, ensuring that only properly authenticated and authorized users can generate access tokens for S3 artifacts.