CVE-2013-1653 in Puppet
Summary
by MITRE
Puppet before 2.6.18, 2.7.x before 2.7.21, and 3.1.x before 3.1.1, and Puppet Enterprise before 1.2.7 and 2.7.x before 2.7.2, when listening for incoming connections is enabled and allowing access to the "run" REST endpoint is allowed, allows remote authenticated users to execute arbitrary code via a crafted HTTP request.
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Analysis
by VulDB Data Team • 01/01/2022
The vulnerability identified as CVE-2013-1653 represents a critical remote code execution flaw in the Puppet configuration management system that affected multiple versions of both the open source Puppet and Puppet Enterprise products. This vulnerability specifically targets the REST API endpoint handling within Puppet's web server implementation, creating a pathway for authenticated attackers to execute arbitrary code on affected systems. The issue stems from inadequate input validation and sanitization within the HTTP request processing logic that handles the "run" endpoint, which is designed to allow remote execution of Puppet manifests and configurations. The vulnerability is particularly concerning because it requires only authenticated access, meaning that an attacker who has obtained valid credentials for a Puppet user account can leverage this flaw to gain full system control without requiring additional privileges or complex exploitation techniques.
The technical root cause of this vulnerability lies in the improper handling of HTTP request parameters within Puppet's web interface, which falls under CWE-20, or "Improper Input Validation." When the system processes incoming HTTP requests to the "run" REST endpoint, it fails to properly sanitize or validate user-supplied data before using it in system commands or configuration processing. This creates a classic command injection scenario where malicious input can be interpreted as executable commands by the underlying system. The flaw is particularly dangerous because Puppet servers often run with elevated privileges and have access to sensitive system resources, making successful exploitation potentially devastating. The vulnerability affects Puppet versions from 2.6.18 and below, 2.7.21 and below, 3.1.1 and below, along with corresponding Puppet Enterprise versions, indicating this was a widespread issue affecting the core functionality of the configuration management system.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and potential lateral movement within network environments where Puppet is deployed. Organizations using affected Puppet versions may experience unauthorized access to their infrastructure configuration management systems, potentially leading to data breaches, service disruption, and unauthorized modifications to critical system configurations. The vulnerability's presence in both Puppet and Puppet Enterprise versions suggests that it was a fundamental flaw in the core architecture rather than a specific implementation issue, affecting organizations of all sizes that rely on Puppet for infrastructure automation. Attackers could potentially use this vulnerability to establish persistent backdoors, exfiltrate sensitive configuration data, or disrupt critical infrastructure services managed by Puppet. The fact that this vulnerability affects the "run" endpoint means that it could be exploited to execute arbitrary Puppet manifests, potentially allowing attackers to modify system configurations, install malware, or gain unauthorized access to other systems within the managed network environment.
Organizations should prioritize immediate patching of affected Puppet installations to address this vulnerability, as no effective workarounds exist without modifying the core system behavior. The recommended mitigation strategy involves upgrading to patched versions of Puppet and Puppet Enterprise, specifically versions 2.6.18, 2.7.21, 3.1.1, 1.2.7, and 2.7.2 respectively, which contain the necessary security fixes. Additionally, administrators should implement network segmentation and access controls to limit exposure of Puppet servers to untrusted networks, ensuring that only authorized users can access the REST API endpoints. The vulnerability demonstrates the importance of proper input validation and the principle of least privilege in system design, as the flaw could have been prevented through better parameter sanitization and more restrictive access controls on the web server endpoints. Organizations should also consider implementing monitoring solutions to detect suspicious activity on Puppet servers and establish incident response procedures specifically for configuration management system compromises, as these systems often serve as critical infrastructure components that, when compromised, can affect entire enterprise environments. This vulnerability aligns with ATT&CK technique T1059, "Command and Scripting Interpreter," and T1068, "Exploitation for Privilege Escalation," highlighting the need for comprehensive security measures around privileged system interfaces.