CVE-2018-1000107 in Job
Summary
by MITRE
An improper authorization vulnerability exists in Jenkins Job and Node Ownership Plugin 0.11.0 and earlier in OwnershipDescription.java, JobOwnerJobProperty.java, and OwnerNodeProperty.java that allow an attacker with Job/Configure or Computer/Configure permission and without Ownership related permissions to override ownership metadata.
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Analysis
by VulDB Data Team • 07/16/2020
The vulnerability described in CVE-2018-1000107 represents a critical improper authorization flaw within the Jenkins Job and Node Ownership Plugin ecosystem. This issue affects versions 0.11.0 and earlier, specifically targeting the core ownership metadata management components. The vulnerability stems from insufficient access control checks within the plugin's implementation, creating a pathway for unauthorized privilege escalation. Attackers exploiting this weakness can manipulate ownership information without possessing the appropriate administrative permissions, fundamentally undermining the security model that governs job and node ownership within Jenkins environments.
The technical implementation of this vulnerability resides in three primary Java files: OwnershipDescription.java, JobOwnerJobProperty.java, and OwnerNodeProperty.java. These components handle the metadata associated with job and node ownership, yet fail to properly validate authorization levels before allowing ownership modifications. The flaw manifests when an attacker with minimal permissions - specifically Job/Configure or Computer/Configure access - can bypass the intended ownership-related permission checks. This design oversight creates a direct attack vector that allows privilege escalation through metadata manipulation rather than through traditional administrative access methods.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it fundamentally compromises the integrity of Jenkins security policies. When an attacker can override ownership metadata, they essentially gain the ability to impersonate legitimate owners of jobs and nodes within the system. This capability enables malicious actors to hide their activities, manipulate access controls, and potentially gain deeper system access through the compromised ownership relationships. The vulnerability particularly affects organizations that rely on Jenkins for automated build and deployment processes, where job ownership controls are critical for maintaining security boundaries and audit trails.
Security professionals should recognize this vulnerability as a classic example of insufficient authorization checks, aligning with CWE-862 - "Missing Authorization" and potentially related to CWE-284 - "Improper Access Control." From an ATT&CK framework perspective, this vulnerability maps to T1078 - "Valid Accounts" and T1484 - "Group Policy Modification" as attackers can effectively manipulate the system's permission model through ownership metadata. The vulnerability also relates to T1566 - "Phishing" in scenarios where attackers might use compromised ownership information to establish more convincing fraudulent activities within the Jenkins environment.
Mitigation strategies for this vulnerability require immediate attention from system administrators and security teams. The most effective immediate solution involves upgrading to a patched version of the Jenkins Job and Node Ownership Plugin, as the vulnerability was addressed in subsequent releases. Organizations should also implement strict monitoring of ownership-related configuration changes and establish automated alerts for unauthorized metadata modifications. Additionally, security teams should review and enforce the principle of least privilege, ensuring that users with Job/Configure or Computer/Configure permissions cannot inadvertently compromise ownership relationships through configuration changes. Regular security audits of Jenkins plugins and their permission models should be conducted to identify similar authorization gaps that could lead to similar vulnerabilities in other components of the system.