CVE-2017-1000105 in Jenkin
Summary
by MITRE
The optional Run/Artifacts permission can be enabled by setting a Java system property. Blue Ocean did not check this permission before providing access to archived artifacts, Item/Read permission was sufficient.
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Analysis
by VulDB Data Team • 11/22/2019
The vulnerability identified as CVE-2017-1000105 resides within the Blue Ocean continuous integration plugin for Jenkins, representing a critical authorization bypass flaw that undermines the security model of the platform. This issue stems from an improper implementation of access control mechanisms within the plugin's artifact handling functionality. The vulnerability specifically affects the Run/Artifacts permission system, which is designed to control access to build artifacts stored in Jenkins. When a particular Java system property is set, the Run/Artifacts permission becomes enabled, yet the Blue Ocean plugin fails to properly validate this permission level before granting access to archived build artifacts. This oversight creates a significant security gap where users with only Item/Read permission can potentially access sensitive build artifacts that should be restricted to users with higher privileges.
The technical flaw manifests in the plugin's failure to perform proper permission validation during artifact retrieval operations. Normally, Jenkins implements a layered permission model where different levels of access are required for various operations. Item/Read permission should be sufficient for viewing basic job information but not for accessing archived artifacts. However, the Blue Ocean plugin's implementation does not adequately check whether the Run/Artifacts permission has been properly enabled through the system property configuration. This creates a scenario where the system's intended access controls are circumvented, allowing unauthorized access to potentially sensitive build outputs, source code snapshots, or other confidential information contained within archived artifacts. The vulnerability is particularly concerning because it operates at the plugin level, meaning it affects the user interface and experience of Jenkins without requiring direct system-level manipulation.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can lead to data leakage and potential compromise of development environments. Attackers who gain access to build artifacts through this vulnerability may obtain sensitive information such as compiled binaries, configuration files, source code versions, or even credentials that were inadvertently included in build processes. This can result in intellectual property theft, exposure of security vulnerabilities in source code, or provide attackers with additional attack vectors for further exploitation. The vulnerability affects organizations that rely on Jenkins for continuous integration and delivery processes, where build artifacts often contain sensitive information about applications under development. The risk is amplified in environments where multiple teams collaborate on projects, as the flaw allows for cross-team access to confidential build outputs that should remain restricted to authorized personnel.
Organizations affected by this vulnerability should implement immediate mitigations to protect their Jenkins environments. The primary recommendation is to upgrade to a patched version of the Blue Ocean plugin that properly validates Run/Artifacts permissions before granting access to archived artifacts. Administrators should also review and tighten their Jenkins permission configurations, ensuring that users with Item/Read permission cannot access build artifacts unless explicitly authorized. Additionally, monitoring should be implemented to detect unauthorized access attempts to build artifacts, and regular audits of system properties and plugin configurations should be conducted to identify potential exploitation attempts. This vulnerability aligns with CWE-284, which addresses improper access control, and represents a clear violation of the principle of least privilege in information security. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques where attackers can leverage insufficient authorization checks to gain access to restricted resources, potentially enabling further reconnaissance and lateral movement within the development infrastructure.