CVE-2011-0528 in Puppet
Summary
by MITRE
Puppet 2.6.0 through 2.6.3 does not properly restrict access to node resources, which allows remote authenticated Puppet nodes to read or modify the resources of other nodes via unspecified vectors.
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Analysis
by VulDB Data Team • 01/18/2025
The vulnerability identified as CVE-2011-0528 affects Puppet versions 2.6.0 through 2.6.3, representing a critical access control flaw that undermines the security model of the configuration management system. This issue stems from inadequate restrictions on node resource access, creating a scenario where authenticated Puppet nodes can potentially compromise the integrity and confidentiality of resources belonging to other nodes within the same Puppet infrastructure. The vulnerability manifests in the form of insufficient authorization checks that should prevent nodes from accessing resources they do not own or control, thereby violating fundamental security principles of isolation and privilege separation that are essential for distributed configuration management systems.
The technical flaw resides in the improper implementation of resource access controls within Puppet's node classification and resource management mechanisms. When nodes authenticate to the Puppet master server, the system should enforce strict boundaries that prevent one node from accessing or modifying resources designated for another node. However, this vulnerability allows malicious or compromised nodes to exploit unspecified vectors that bypass these access controls, potentially enabling information disclosure, resource tampering, or unauthorized modifications to critical infrastructure components. The unspecified nature of the attack vectors suggests that multiple pathways exist for exploitation, including but not limited to resource reference manipulation, node classification bypasses, or credential leakage scenarios.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the trust model of Puppet infrastructure deployments. Attackers leveraging this vulnerability can gain unauthorized access to sensitive configuration data, modify system resources, or potentially disrupt service availability across multiple nodes. This represents a significant threat to enterprise environments that rely heavily on Puppet for configuration management, as it could enable attackers to move laterally within the infrastructure or gain access to resources that should be isolated. The vulnerability affects the integrity of the configuration management system itself, potentially allowing attackers to manipulate node configurations, deploy malicious code, or establish persistent access points within the network infrastructure.
Organizations should implement immediate mitigations including upgrading to Puppet versions 2.6.4 or later, where this vulnerability has been addressed through enhanced access control mechanisms and proper resource isolation. System administrators should also review and audit existing Puppet configurations to ensure that proper node classification and resource access controls are in place. The vulnerability aligns with CWE-284, which addresses improper access control, and represents a clear violation of the principle of least privilege that is fundamental to secure system design. From an ATT&CK perspective, this vulnerability maps to techniques involving privilege escalation and lateral movement within compromised environments, as attackers can leverage it to access resources beyond their intended scope. Additionally, organizations should consider implementing network segmentation, monitoring for anomalous Puppet master communications, and regular security assessments to identify potential exploitation attempts. The remediation process should include comprehensive testing of updated configurations to ensure that legitimate node access continues to function properly while preventing the unauthorized access patterns that this vulnerability enables.