CVE-2019-10367 in Configuration as Code Plugin
Summary
by MITRE
Due to an incomplete fix of CVE-2019-10343, Jenkins Configuration as Code Plugin 1.26 and earlier did not properly apply masking to some values expected to be hidden when logging the configuration being applied.
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Analysis
by VulDB Data Team • 07/22/2020
The vulnerability described in CVE-2019-10367 represents a critical security flaw in the Jenkins Configuration as Code Plugin that emerged from an inadequate remediation of a previous vulnerability. This issue affects versions 1.26 and earlier of the plugin, where the developers failed to implement complete masking for sensitive configuration values during logging operations. The problem stems from the improper handling of credential data and other confidential information that should remain hidden when the plugin logs configuration details during the application process. The incomplete fix for CVE-2019-10343 left residual vulnerabilities that allowed sensitive data to be exposed through log outputs, creating a significant risk for systems that rely on Jenkins for automated configuration management. This vulnerability directly impacts the principle of least privilege and data protection by potentially exposing confidential information to unauthorized parties who may have access to system logs.
The technical flaw manifests in the plugin's logging mechanism where certain configuration values that should be masked or obfuscated are instead logged in their clear text form. This occurs because the masking implementation does not adequately cover all data types or configuration parameters that require protection. When Jenkins applies configuration changes through the Configuration as Code plugin, the system generates log entries that contain sensitive information such as passwords, API keys, or other authentication credentials. The failure to properly mask these values means that administrators or attackers with access to log files could potentially extract confidential data from these entries. This vulnerability falls under the category of information exposure through logging, which is classified as CWE-209 in the Common Weakness Enumeration catalog. The flaw represents a failure in input validation and output sanitization processes, where the plugin does not properly distinguish between sensitive and non-sensitive data during the logging phase of configuration application.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential attack vectors for malicious actors who may have access to system logs or monitoring infrastructure. Attackers could exploit this vulnerability to gain access to authentication credentials, API keys, or other sensitive configuration parameters that are routinely logged during normal operations. The exposure of such information could lead to unauthorized access to Jenkins systems, downstream applications, or integrated services that rely on the configuration values. This vulnerability particularly affects environments where Jenkins is used for continuous integration and deployment workflows, where configuration files often contain credentials for various systems and services. The risk is amplified in multi-tenant environments or shared infrastructure where multiple users or teams may have access to log files, potentially allowing lateral movement or privilege escalation attacks. According to ATT&CK framework, this vulnerability maps to T1078 (Valid Accounts) and T1566 (Phishing) as attackers could leverage exposed credentials to establish persistent access or conduct social engineering attacks.
Organizations should immediately update to Jenkins Configuration as Code Plugin version 1.27 or later, which contains the complete fix for both CVE-2019-10343 and CVE-2019-10367. The remediation process involves ensuring that all sensitive configuration values are properly masked during logging operations and that the masking implementation covers all data types and parameter configurations that may contain confidential information. System administrators should conduct thorough log reviews to identify any previously exposed sensitive data and implement proper log access controls to limit who can view system logs. Additional mitigations include implementing log file encryption, establishing regular log monitoring procedures, and ensuring that log retention policies do not inadvertently preserve sensitive information for extended periods. Security teams should also consider implementing network segmentation and access controls around Jenkins systems to limit exposure even if credential information is compromised through other vectors. The vulnerability highlights the importance of thorough vulnerability remediation and regression testing, particularly when addressing security issues that involve data masking and logging behaviors.