CVE-2017-1000103 in Jenkins
Summary
by MITRE
The custom Details view of the Static Analysis Utilities based DRY Plugin, was vulnerable to a persisted cross-site scripting vulnerability: Malicious users able to influence the input to this plugin could insert arbitrary HTML into this view.
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Analysis
by VulDB Data Team • 01/15/2021
The vulnerability identified as CVE-2017-1000103 resides within the Static Analysis Utilities based DRY Plugin for Jenkins, specifically affecting the custom Details view functionality. This represents a critical security flaw that enables attackers to execute persistent cross-site scripting attacks against users interacting with the plugin's interface. The vulnerability stems from inadequate input validation and sanitization mechanisms within the plugin's rendering process, allowing malicious actors to inject harmful HTML content that persists across user sessions and interactions. The DRY plugin, designed for static code analysis and duplication detection, becomes a vector for malicious code execution when users view the affected Details view, as the system fails to properly escape or filter user-supplied data before displaying it in the web interface.
The technical implementation of this vulnerability involves the plugin's failure to properly sanitize user input when generating the Details view output. When malicious users provide input that contains HTML or JavaScript code, the plugin stores this data without adequate sanitization and subsequently renders it directly within the web page without proper HTML escaping or context-appropriate filtering. This creates a persistent XSS condition where the injected code executes in the context of other users' browsers who view the affected Details view. The vulnerability is classified as a persistent XSS due to the stored nature of the malicious payload, which remains in the system and affects multiple users rather than requiring immediate interaction with a specific page. According to CWE-79, this vulnerability directly maps to Cross-Site Scripting flaws that occur when user-controllable data is included in web pages without proper validation or sanitization.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it enables attackers to manipulate the entire static analysis interface and potentially escalate privileges within the Jenkins environment. An attacker could inject malicious scripts that steal authentication tokens, redirect users to phishing sites, or even execute arbitrary commands on the Jenkins server if the application has insufficient security controls. The vulnerability affects all users who interact with the DRY plugin's Details view, making it particularly dangerous in multi-user environments where administrators and developers regularly review static analysis reports. This weakness could be exploited to gain unauthorized access to sensitive code analysis data, manipulate security findings, or establish persistent backdoors within the development infrastructure. The attack vector aligns with ATT&CK technique T1213.002 for Data from Information Repositories, where attackers target source code repositories and analysis tools to extract sensitive information.
Mitigation strategies for this vulnerability require immediate patching of the affected Jenkins plugin to implement proper input sanitization and output encoding mechanisms. Organizations should ensure that all user-supplied data is properly escaped before being rendered in web interfaces, implementing context-appropriate encoding for HTML, JavaScript, and other potentially dangerous content. Security teams should also consider implementing Content Security Policy headers to limit the execution of inline scripts and restrict the sources from which scripts can be loaded. Additionally, regular security scanning of Jenkins plugins and applications should be conducted to identify similar vulnerabilities in other components. The recommended approach includes validating all input through whitelisting mechanisms, implementing proper output encoding, and maintaining updated security patches across the entire Jenkins ecosystem. Organizations should also consider network segmentation and access controls to limit the potential impact of successful exploitation, as the vulnerability could enable attackers to move laterally within the development infrastructure.