CVE-2016-3106 in Pulp
Summary
by MITRE
Pulp before 2.8.3 creates a temporary directory during CA key generation in an insecure manner.
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Analysis
by VulDB Data Team • 11/29/2022
The vulnerability identified as CVE-2016-3106 affects the Pulp content management system version 2.8.3 and earlier, specifically during the Certificate Authority key generation process. This issue stems from the insecure creation of temporary directories that can be exploited by malicious actors to gain unauthorized access to sensitive cryptographic materials. The Pulp system is widely used for managing and distributing software packages, making this vulnerability particularly concerning for organizations relying on secure package distribution infrastructure.
The technical flaw resides in how Pulp handles temporary directory creation when generating Certificate Authority keys for secure communications. The system creates temporary directories with predictable naming conventions and insufficient permission controls, allowing local users to potentially manipulate or access these directories before the legitimate process completes. This insecure temporary directory creation pattern falls under the category of insecure temporary file handling, which is classified as CWE-377. The vulnerability enables attackers to perform race condition attacks where they can substitute or read sensitive files during the key generation process, potentially compromising the entire certificate authority infrastructure.
The operational impact of this vulnerability extends beyond simple privilege escalation as it can lead to complete compromise of the Pulp server's security posture. An attacker who successfully exploits this vulnerability can obtain the CA private key, which would allow them to issue fraudulent certificates for the Pulp server. This could result in man-in-the-middle attacks against clients communicating with the Pulp server, enabling unauthorized package distribution, code injection, and complete loss of trust in the software distribution pipeline. Organizations using Pulp for package management would face significant security risks, including potential supply chain attacks where malicious packages could be distributed through the compromised infrastructure.
The exploitation of this vulnerability aligns with techniques described in the ATT&CK framework under the T1059 (Command and Scripting Interpreter) and T1552 (Unsecured Credentials) tactics. Security professionals should implement immediate mitigations including upgrading to Pulp version 2.8.3 or later, which contains proper temporary directory handling mechanisms. Additional protective measures include monitoring for unusual temporary directory creation patterns, implementing proper file system permissions for temporary locations, and conducting regular security audits of the certificate management processes. Organizations should also consider implementing automated vulnerability scanning tools that can detect insecure temporary file handling patterns in their software environments, as this vulnerability represents a common attack vector that can be systematically identified and prevented through proper security controls and configuration management practices.