CVE-2013-4969 in Puppet
Summary
by MITRE
Puppet before 3.3.3 and 3.4 before 3.4.1 and Puppet Enterprise (PE) before 2.8.4 and 3.1 before 3.1.1 allows local users to overwrite arbitrary files via a symlink attack on unspecified files.
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Analysis
by VulDB Data Team • 01/18/2022
The vulnerability identified as CVE-2013-4969 represents a critical file system security flaw affecting Puppet configuration management software across multiple versions. This issue manifests as a symlink attack that enables local users to overwrite arbitrary files within the system, fundamentally compromising the integrity and security of the configuration management infrastructure. The vulnerability impacts both standard Puppet distributions and Puppet Enterprise editions, creating widespread exposure across organizations relying on these tools for system automation and configuration management.
The technical root cause of this vulnerability lies in improper handling of symbolic links during file operations within the Puppet framework. When Puppet processes configuration files or performs system updates, it fails to adequately validate or sanitize symbolic link references, allowing malicious local users to manipulate the file system through carefully crafted symlink attacks. This flaw operates at the file system level and leverages the inherent trust relationships within the configuration management process, where Puppet typically operates with elevated privileges to manage system configurations. The vulnerability is classified under CWE-59 as a "Improper Link Resolution" issue, specifically involving the failure to properly handle symbolic links in file operations.
The operational impact of CVE-2013-4969 extends far beyond simple file overwriting capabilities, as it provides attackers with a pathway to compromise the entire configuration management infrastructure. Local users who can exploit this vulnerability can potentially overwrite critical system files, configuration files, or even the Puppet agent itself, leading to complete system compromise or denial of service conditions. This vulnerability particularly affects environments where Puppet is used for managing critical infrastructure components, as it undermines the trust model that configuration management systems rely upon. The attack vector is particularly concerning because it requires only local access, making it difficult to detect and prevent through traditional network-based security measures.
Organizations utilizing affected Puppet versions face significant risk of privilege escalation and persistent system compromise. The vulnerability enables attackers to manipulate the configuration management process itself, potentially allowing them to establish backdoors, modify security policies, or disrupt automated deployment processes. This creates a dangerous scenario where the very tools meant to secure and manage systems become attack vectors for system compromise. Security practitioners should note that this vulnerability aligns with ATT&CK technique T1059.001 for command and script interpretation, as attackers could leverage the compromised Puppet environment to execute malicious commands or scripts. The remediation process requires immediate patching of all affected Puppet installations, including both community and enterprise editions, with proper validation of the patched versions to ensure complete mitigation. System administrators should also implement additional monitoring for unusual file system activities and symbolic link creation within Puppet-managed directories to detect potential exploitation attempts.