CVE-2018-6512 in Puppet Enterprise
Summary
by MITRE
The previous version of Puppet Enterprise 2018.1 is vulnerable to unsafe code execution when upgrading pe-razor-server. Affected releases are Puppet Enterprise: 2018.1.x versions prior to 2018.1.1 and razor-server and pe-razor-server prior to 1.9.0.0.
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Analysis
by VulDB Data Team • 02/18/2020
The vulnerability identified as CVE-2018-6512 represents a critical security flaw in Puppet Enterprise 2018.1 releases that specifically affects the pe-razor-server component during upgrade operations. This issue stems from improper handling of code execution during the upgrade process, creating a potential attack vector for malicious actors who can exploit the system during what should be a routine maintenance operation. The vulnerability affects organizations using Puppet Enterprise 2018.1.x versions before 2018.1.1 and razor-server components prior to 1.9.0.0, making it particularly concerning for enterprises that rely on automated infrastructure management tools for their operations. The flaw manifests during the upgrade process of the pe-razor-server package, which is a critical component responsible for infrastructure provisioning and management within Puppet Enterprise environments.
The technical root cause of this vulnerability lies in the unsafe execution of code during package upgrade procedures, specifically within the razor-server functionality of Puppet Enterprise. This issue creates an environment where arbitrary code execution can occur when the system processes upgrade instructions for the pe-razor-server component. The vulnerability is classified under CWE-78 as a weakness related to improper neutralization of special elements used in OS commands, which directly maps to the unsafe code execution scenario. During the upgrade process, the system fails to properly validate or sanitize inputs that are subsequently executed as code, allowing attackers to inject malicious commands that can be executed with the privileges of the system running the upgrade process. This represents a significant escalation of privilege vulnerability that can be exploited to gain unauthorized access to critical infrastructure management systems.
The operational impact of CVE-2018-6512 extends far beyond simple code execution capabilities, as it can enable attackers to compromise entire Puppet Enterprise environments that rely on the razor-server for infrastructure provisioning. Organizations using affected versions of Puppet Enterprise face potential exposure to full system compromise, data exfiltration, and disruption of automated infrastructure management processes. The vulnerability is particularly dangerous because it occurs during upgrade operations, which are typically performed with elevated privileges and during maintenance windows when security monitoring may be reduced. Attackers can leverage this vulnerability to establish persistent access, modify configuration files, and potentially use the compromised system as a launch point for further attacks within the network infrastructure. This aligns with ATT&CK technique T1059.001 for command and scripting interpreter, where adversaries use legitimate system tools to execute malicious code.
Organizations should immediately implement mitigation strategies focusing on updating to patched versions of Puppet Enterprise 2018.1.1 and ensuring razor-server components are upgraded to version 1.9.0.0 or later. The remediation process should include comprehensive testing of upgrade procedures in non-production environments before applying patches to production systems. Security teams should also implement network segmentation and monitoring to detect unauthorized upgrade activities or suspicious command executions during maintenance windows. Additional protective measures include implementing strict access controls for upgrade operations, enabling detailed audit logging, and conducting regular vulnerability assessments to identify similar issues in other infrastructure management tools. The vulnerability demonstrates the critical importance of proper input validation and privilege separation in system upgrade processes, particularly for tools that manage infrastructure provisioning and configuration across enterprise environments.