CVE-2017-2601 in Jenkins
Summary
by MITRE
Jenkins before versions 2.44, 2.32.2 is vulnerable to a persisted cross-site scripting in parameter names and descriptions (SECURITY-353). Users with the permission to configure jobs were able to inject JavaScript into parameter names and descriptions.
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Analysis
by VulDB Data Team • 03/11/2023
This vulnerability resides in the Jenkins continuous integration and delivery platform, specifically affecting versions prior to 2.44 and 2.32.2. The flaw represents a persistent cross-site scripting vulnerability that allows authenticated users with job configuration permissions to inject malicious javascript code into parameter names and descriptions. The vulnerability is categorized under CWE-79 as a failure to sanitize user input, specifically in the context of web application parameters that are subsequently rendered without proper output encoding. This issue enables attackers to execute arbitrary javascript code in the context of other users' browsers, creating a significant security risk within development environments where Jenkins serves as a central automation platform. The vulnerability stems from insufficient input validation and output encoding mechanisms within Jenkins' parameter handling functionality, particularly in the job configuration interface where users can define build parameters.
The operational impact of this vulnerability extends beyond simple script execution as it enables attackers to perform various malicious activities including session hijacking, data exfiltration, and privilege escalation within the Jenkins environment. When exploited, the injected javascript code can access the victim's browser session, potentially allowing attackers to obtain administrative privileges or steal sensitive build artifacts and credentials stored within Jenkins. The vulnerability is particularly dangerous in enterprise environments where Jenkins often serves as a central hub for automated builds, deployments, and access to sensitive systems. Attackers can leverage this vulnerability to maintain persistent access to the Jenkins instance, as the malicious scripts will execute whenever the affected parameters are displayed or processed. This aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where adversaries use browser-based scripting to execute malicious code. The vulnerability also supports ATT&CK technique T1566.001 for spearphishing attachments, as attackers can craft malicious parameter names that, when viewed by other users, trigger the execution of harmful scripts.
Mitigation strategies for this vulnerability include immediate upgrade to Jenkins versions 2.44 or 2.32.2, which contain the necessary patches to prevent javascript injection in parameter names and descriptions. Organizations should also implement comprehensive input validation and output encoding mechanisms throughout the Jenkins interface, particularly for user-supplied content in parameter definitions. Security administrators should conduct regular audits of job configurations to identify and remove potentially malicious parameter entries, while also implementing proper access controls to limit who can modify job parameters. The principle of least privilege should be enforced, ensuring that only authorized personnel have the ability to configure jobs with potentially dangerous parameter types. Additionally, organizations should consider implementing web application firewalls and content security policies to provide additional layers of protection against cross-site scripting attacks. Regular security training for development teams regarding secure coding practices and the risks associated with untrusted input processing will further reduce the likelihood of exploitation. This vulnerability demonstrates the critical importance of sanitizing user input and properly encoding output in web applications, as highlighted in industry standards such as OWASP Top 10 A03:2021 - Injection and the CWE-79 remediation guidelines that emphasize the need for proper input validation and output encoding to prevent cross-site scripting vulnerabilities.