CVE-2016-8608 in JBoss BRMS
Summary
by MITRE
JBoss BRMS 6 and BPM Suite 6 are vulnerable to a stored XSS via business process editor. The flaw is due to an incomplete fix for CVE-2016-5398. Remote, authenticated attackers that have privileges to create business processes can store scripts in them, which are not properly sanitized before showing to other users, including admins.
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Analysis
by VulDB Data Team • 04/28/2023
The vulnerability identified as CVE-2016-8608 affects JBoss Business Rules Management System version 6 and JBoss Business Process Management Suite version 6, representing a critical stored cross-site scripting flaw that exploits a regression in security controls. This vulnerability specifically targets the business process editor component where users can create and modify business processes, creating an attack vector that allows authenticated adversaries to inject malicious scripts into process definitions that persist in the system. The flaw constitutes a direct regression from CVE-2016-5398, indicating that a previous attempt to address similar XSS vulnerabilities was incomplete or improperly implemented, leaving the system vulnerable to the same class of attacks. The vulnerability exists within the sanitization mechanisms of the business process editor, where user-supplied input is not properly validated or escaped before being rendered to other users, including administrative personnel who may view these processes.
The technical exploitation of this vulnerability requires an attacker to possess valid authentication credentials and appropriate privileges to create or modify business processes within the JBoss suite, which aligns with the ATT&CK technique T1078 for valid accounts and T1213 for data from information repositories. When an attacker successfully stores malicious scripts within a business process definition, these scripts execute in the context of other users' browsers when they view the process, particularly targeting administrators who may have elevated privileges. The stored nature of this XSS vulnerability means that the malicious code persists in the system's database and executes every time the affected process is accessed, creating a persistent threat that can be leveraged for session hijacking, credential theft, or privilege escalation. This vulnerability directly maps to CWE-79, which describes cross-site scripting flaws, and CWE-20, which addresses improper input validation, with the persistent nature of the flaw specifically aligning with CWE-116 for improper encoding or escaping of output.
The operational impact of CVE-2016-8608 is significant, as it allows attackers to compromise the entire business process management environment through a single vulnerable component. Administrative users who view affected business processes become victims of the stored XSS, potentially enabling attackers to steal administrative sessions, escalate privileges, or exfiltrate sensitive business process data. The vulnerability undermines the integrity of the business process management system by allowing attackers to inject malicious content that can be executed in the browsers of legitimate users, creating a persistent backdoor for further attacks. Organizations using JBoss BRMS 6 and BPM Suite 6 are at risk of unauthorized access to business-critical processes, potential data breaches, and compromise of business process integrity, particularly when administrative users regularly access business process definitions. The vulnerability also enables attackers to conduct phishing attacks against other users within the system, as the malicious scripts can manipulate browser behavior and redirect users to attacker-controlled domains.
Mitigation strategies for CVE-2016-8608 require immediate patching of the affected JBoss products to address the incomplete fix for the XSS vulnerability, with organizations implementing comprehensive input validation and output encoding mechanisms. Security teams should enforce strict content sanitization policies within the business process editor, implementing proper HTML escaping and validation of all user-supplied input before storage. Organizations should consider implementing web application firewalls to detect and block suspicious script content, while also establishing network segmentation to limit the scope of potential compromise. Additionally, privileged user accounts should be monitored for suspicious activity, and regular security assessments should be conducted to identify similar regressions in security controls. The vulnerability demonstrates the importance of proper regression testing in security patches, as the incomplete fix for CVE-2016-5398 resulted in a new vulnerability that maintains the same attack surface while potentially expanding the threat vector. Organizations should also implement security awareness training for administrators and developers to recognize and prevent XSS vulnerabilities in business process definitions and other web-based applications.