CVE-2019-10466 in 360 FireLine Plugin
Summary
by MITRE
An XML external entities (XXE) vulnerability in Jenkins 360 FireLine Plugin allows attackers with Overall/Read access to have Jenkins resolve external entities, resulting in the extraction of secrets from the Jenkins agent, server-side request forgery, or denial-of-service attacks.
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Analysis
by VulDB Data Team • 10/24/2019
The vulnerability identified as CVE-2019-10466 represents a critical XML external entities (XXE) flaw within the Jenkins 360 FireLine Plugin, a widely used component in continuous integration and delivery environments. This vulnerability exposes Jenkins instances to significant security risks by enabling unauthorized exploitation through the manipulation of XML processing mechanisms. The issue specifically affects systems where the FireLine plugin is installed and configured, creating an attack surface that can be leveraged by threat actors with minimal privileges.
The technical implementation of this XXE vulnerability stems from improper input validation within the plugin's XML parsing functionality. When Jenkins processes XML data containing external entity references, the system fails to adequately sanitize or restrict these references, allowing attackers to craft malicious XML payloads that can trigger unintended behavior. This flaw operates at the core of XML processing, where external entities are resolved by the parser, potentially leading to information disclosure, server-side request forgery, or denial-of-service conditions. The vulnerability is particularly dangerous because it requires only Overall/Read access privileges, which are commonly granted to users within Jenkins environments, making exploitation relatively accessible.
The operational impact of this vulnerability extends beyond simple information disclosure, creating multiple attack vectors that can compromise Jenkins security posture. Attackers can leverage the XXE vulnerability to extract sensitive information from Jenkins agents, potentially accessing credentials, API keys, or other confidential data stored within the system. The server-side request forgery component allows adversaries to make arbitrary requests from the Jenkins server, potentially enabling them to probe internal networks or access other systems that are normally protected by network segmentation. Additionally, the denial-of-service aspect can disrupt continuous integration workflows, causing production delays and operational disruptions that can have significant business implications.
Organizations affected by CVE-2019-10466 should implement immediate mitigations to protect their Jenkins environments from exploitation. The primary recommendation involves updating the 360 FireLine plugin to the latest version that contains XXE vulnerability patches, as this addresses the root cause of the issue. System administrators should also configure XML parsers to disable external entity resolution and parameter entity expansion, which aligns with industry best practices for XXE prevention. Network segmentation and access control measures should be reviewed to ensure that only authorized personnel can access Jenkins with sufficient privileges to interact with potentially vulnerable plugins. The vulnerability maps to CWE-611 (Improper Restriction of XML External Entity Reference) and can be categorized under ATT&CK technique T1078 (Valid Accounts) and T1190 (Exploit Public-Facing Application), highlighting its potential for privilege escalation and lateral movement within compromised environments. Regular security assessments and vulnerability scanning should be implemented to identify similar XXE vulnerabilities in other Jenkins plugins or integrated systems, as this represents a common pattern that can affect various XML processing components across different platforms and applications.