CVE-2012-1986 in Puppet Enterprise Users
Summary
by MITRE
Puppet 2.6.x before 2.6.15 and 2.7.x before 2.7.13, and Puppet Enterprise (PE) Users 1.0, 1.1, 1.2.x, 2.0.x, and 2.5.x before 2.5.1 allows remote authenticated users with an authorized SSL key and certain permissions on the puppet master to read arbitrary files via a symlink attack in conjunction with a crafted REST request for a file in a filebucket.
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Analysis
by VulDB Data Team • 12/03/2021
The vulnerability identified as CVE-2012-1986 represents a critical security flaw in Puppet configuration management software that affects multiple versions of both the open source Puppet and Puppet Enterprise platforms. This vulnerability stems from insufficient validation of file paths during filebucket operations, creating a path traversal condition that can be exploited by authenticated attackers who possess valid SSL credentials and appropriate permissions on the puppet master server. The issue specifically manifests when a crafted REST request is made to access files within the filebucket, leveraging symbolic link manipulation to bypass normal access controls and potentially read sensitive files from the underlying filesystem.
The technical implementation of this vulnerability involves a combination of factors that create an exploitable condition within the Puppet master's file handling mechanisms. When a user with authorized SSL key access makes a REST request to retrieve a file from the filebucket, the system fails to properly validate the symbolic link resolution process. This allows an attacker to craft a request that includes malicious path traversal sequences, enabling them to traverse the filesystem beyond the intended filebucket boundaries. The vulnerability is particularly dangerous because it requires only authentication with a valid SSL key and appropriate permissions, which many organizations may not adequately control or monitor, making it accessible to both internal and external threat actors who have gained such credentials.
From an operational impact perspective, this vulnerability can lead to significant data breaches and system compromise within environments that rely on Puppet for configuration management. Attackers who successfully exploit this vulnerability can potentially access sensitive configuration files, credential stores, private keys, and other confidential data that may be stored within the filebucket or accessible through the symbolic link resolution process. The attack vector is particularly concerning because it can be executed remotely by authenticated users, meaning that even if network segmentation is in place, compromised credentials could still lead to unauthorized data access. Organizations using Puppet for critical infrastructure management face heightened risk of supply chain attacks or insider threats, as this vulnerability allows for arbitrary file reading without requiring elevated system privileges or root access.
The mitigation strategies for CVE-2012-1986 focus primarily on updating to patched versions of Puppet and Puppet Enterprise, specifically versions 2.6.15 and 2.7.13 for the open source versions, and appropriate patch levels for Puppet Enterprise releases. Organizations should also implement strict access controls and monitoring of SSL key usage, particularly for users with filebucket access permissions. Network segmentation and principle of least privilege should be enforced to limit the scope of potential exploitation, while regular security audits should verify that no unauthorized symbolic links exist within filebucket directories. This vulnerability aligns with CWE-22 Path Traversal and CWE-73 Path Traversal, and represents a technique that could be categorized under ATT&CK tactic TA0006 Credential Access and TA0005 Defense Evasion. Organizations should also consider implementing file integrity monitoring solutions to detect unauthorized symbolic link creation and maintain comprehensive audit logs of filebucket access activities to identify potential exploitation attempts.