CVE-2012-3865 in Puppet
Summary
by MITRE
Directory traversal vulnerability in lib/puppet/reports/store.rb in Puppet before 2.6.17 and 2.7.x before 2.7.18, and Puppet Enterprise before 2.5.2, when Delete is enabled in auth.conf, allows remote authenticated users to delete arbitrary files on the puppet master server via a .. (dot dot) in a node name.
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Analysis
by VulDB Data Team • 12/07/2021
The vulnerability identified as CVE-2012-3865 represents a critical directory traversal flaw within the Puppet configuration management system that affects multiple versions of the software. This issue resides in the lib/puppet/reports/store.rb file and specifically exploits how the system handles node names during report processing. The vulnerability becomes particularly dangerous when the Delete permission is enabled in the auth.conf configuration file, creating a scenario where authenticated attackers can manipulate file paths through specially crafted node names containing directory traversal sequences.
The technical exploitation of this vulnerability relies on the improper sanitization of node names within the Puppet master server's report handling mechanism. When a node name contains .. (dot dot) sequences, the system fails to properly validate or sanitize these inputs before processing file operations. This allows malicious actors who have authenticated access to the Puppet master to craft node names that, when processed, traverse directories and target arbitrary files for deletion. The flaw essentially bypasses normal file system access controls by leveraging the legitimate report storage functionality to execute unauthorized file operations.
From an operational impact perspective, this vulnerability presents a severe threat to Puppet master server security and system integrity. An attacker with valid credentials can potentially delete critical system files, configuration data, or report files that could compromise the entire configuration management infrastructure. The vulnerability affects not only standard Puppet installations but also Puppet Enterprise deployments, making it particularly concerning for organizations relying on enterprise-grade configuration management solutions. The impact extends beyond simple file deletion, as the compromise of report storage functionality can lead to complete disruption of the configuration management workflow and potential data loss.
The vulnerability aligns with CWE-22 Directory Traversal and follows patterns commonly associated with the attack techniques documented in the MITRE ATT&CK framework under T1059 Command and Scripting Interpreter and T1485 Data Destruction. Organizations should implement immediate mitigations including upgrading to patched versions of Puppet where available, disabling unnecessary delete permissions in auth.conf, and implementing proper input validation for node names. Additionally, monitoring for unusual patterns in report processing and node name usage can help detect potential exploitation attempts. The security community should also consider implementing network segmentation and access control measures to limit the blast radius of potential exploitation, as this vulnerability demonstrates how authenticated access can be leveraged to cause significant operational damage to configuration management systems.