CVE-2022-25191 in Agent Server Parameter Plugin
Summary
by MITRE • 02/15/2022
Jenkins Agent Server Parameter Plugin 1.0 and earlier does not escape parameter names of agent server parameters, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission.
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Analysis
by VulDB Data Team • 02/18/2022
The vulnerability identified as CVE-2022-25191 affects the Jenkins Agent Server Parameter Plugin version 1.0 and earlier, presenting a critical stored cross-site scripting flaw that can be exploited by attackers possessing Item/Configure permissions. This vulnerability resides within the plugin's handling of agent server parameters where parameter names are not properly escaped before being rendered in web interfaces. The issue stems from insufficient input validation and output encoding practices within the plugin's user interface components, creating an avenue for malicious code injection that persists in the system's stored data.
The technical flaw manifests when administrators or authorized users configure agent server parameters through the Jenkins interface, as the plugin fails to sanitize parameter names before storing and subsequently displaying them in web pages. This stored XSS vulnerability allows attackers to inject malicious scripts that execute in the context of other users who view the affected parameter values. The vulnerability is particularly concerning because it requires only Item/Configure permission, which many users may possess in typical Jenkins environments, making the attack vector more accessible than vulnerabilities requiring higher privileges.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive credentials, access restricted system information, or manipulate the Jenkins environment to execute unauthorized operations. The stored nature of the vulnerability means that once exploited, the malicious scripts persist and affect all users who encounter the affected parameter values, potentially compromising multiple users over extended periods. This makes the vulnerability particularly dangerous in collaborative environments where multiple administrators or developers interact with the same Jenkins instances.
Mitigation strategies should focus on immediate plugin updates to versions that properly escape parameter names and implement comprehensive input validation. Organizations should also consider implementing additional security controls such as restricting Item/Configure permissions to only essential personnel, deploying web application firewalls to detect and block XSS attempts, and conducting regular security assessments of Jenkins plugins. The vulnerability aligns with CWE-79 (Cross-site Scripting) and can be categorized under ATT&CK technique T1059.007 (Command and Scripting Interpreter: PowerShell) when exploited for lateral movement. Regular monitoring of Jenkins plugin repositories and maintaining updated security practices are essential for preventing similar vulnerabilities from compromising continuous integration and deployment pipelines.