CVE-2018-1000415 in Rebuilder Plugin
Summary
by MITRE
A cross-site scripting vulnerability exists in Jenkins Rebuilder Plugin 1.28 and earlier in RebuildAction/BooleanParameterValue.jelly, RebuildAction/ExtendedChoiceParameterValue.jelly, RebuildAction/FileParameterValue.jelly, RebuildAction/LabelParameterValue.jelly, RebuildAction/ListSubversionTagsParameterValue.jelly, RebuildAction/MavenMetadataParameterValue.jelly, RebuildAction/NodeParameterValue.jelly, RebuildAction/PasswordParameterValue.jelly, RebuildAction/RandomStringParameterValue.jelly, RebuildAction/RunParameterValue.jelly, RebuildAction/StringParameterValue.jelly, RebuildAction/TextParameterValue.jelly, RebuildAction/ValidatingStringParameterValue.jelly that allows users with Job/Configuration permission to insert arbitrary HTML into rebuild forms.
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Analysis
by VulDB Data Team • 04/27/2020
The CVE-2018-1000415 vulnerability represents a critical cross-site scripting flaw within the Jenkins Rebuilder Plugin, specifically affecting versions 1.28 and earlier. This vulnerability resides in multiple Jelly template files within the RebuildAction directory, creating a persistent security weakness that can be exploited by authenticated users with job configuration permissions. The vulnerability stems from inadequate input sanitization and output encoding mechanisms within the plugin's rebuild form rendering functionality, allowing malicious actors to inject arbitrary HTML content into the rebuild interfaces. The affected template files include BooleanParameterValue.jelly, ExtendedChoiceParameterValue.jelly, FileParameterValue.jelly, and numerous others, indicating a systemic issue rather than isolated flaw within the plugin's user interface components.
The technical exploitation of this vulnerability occurs through the manipulation of parameter values within Jenkins rebuild operations, where user-supplied input flows directly into HTML output without proper sanitization. When Jenkins renders these rebuild forms, the injected HTML content becomes executable within the context of the victim's browser session, potentially enabling attackers to perform actions such as stealing session cookies, redirecting users to malicious sites, or executing arbitrary JavaScript code. This vulnerability maps directly to CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') and aligns with ATT&CK technique T1211 - Exploitation for Defense Evasion, as it can be used to establish persistent access through malicious script execution. The vulnerability's impact is amplified by the fact that it requires only Job/Configuration permission, which many users possess in typical Jenkins environments, making it accessible to a broad range of authenticated attackers.
The operational consequences of this vulnerability extend beyond simple script execution, as it can facilitate more sophisticated attacks including session hijacking, data exfiltration, and privilege escalation within the Jenkins environment. Attackers can leverage this flaw to create persistent backdoors through malicious script injection, potentially compromising the entire Jenkins instance and any build jobs that rely on the affected plugin. The vulnerability's presence in multiple parameter types suggests that attackers can target various build configurations and parameter settings, increasing the attack surface significantly. Organizations using Jenkins with the Rebuilder Plugin in production environments face potential exposure to unauthorized code execution and data compromise, particularly in environments where users with configuration permissions may not be fully trusted. The attack vector is particularly concerning as it operates through legitimate Jenkins functionality, making detection more difficult and potentially allowing attackers to remain undetected for extended periods.
Mitigation strategies for CVE-2018-1000415 should prioritize immediate plugin version updates to 1.29 or later, where the XSS vulnerabilities have been addressed through proper input sanitization and output encoding. Organizations should implement comprehensive security scanning of Jenkins plugins and regularly audit installed components for known vulnerabilities. Network segmentation and access control measures should be enforced to limit the impact of potential exploitation, ensuring that only trusted users have Job/Configuration permissions. The Jenkins security team recommends enabling security features such as CSRF protection and implementing Content Security Policy headers to provide additional defense layers. Regular security training for administrators and developers regarding secure coding practices and vulnerability awareness should be implemented to reduce the risk of similar issues in custom plugins or configurations. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts targeting XSS vulnerabilities in their Jenkins environments, as the ATT&CK framework suggests that such detection capabilities are essential for maintaining security posture against this class of vulnerability.