CVE-2016-0349 in Business Process Manager
Summary
by MITRE
IBM Business Process Manager 8.5.6 through 8.5.6.2 and 8.5.7 before 8.5.7.CF201606 allows remote authenticated users to bypass intended access restrictions and update process-instance variables via a REST API call.
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Analysis
by VulDB Data Team • 08/25/2022
The vulnerability identified as CVE-2016-0349 affects IBM Business Process Manager versions 8.5.6 through 8.5.6.2 and 8.5.7 before 8.5.7.CF201606, representing a critical access control flaw that undermines the security posture of enterprise workflow management systems. This issue stems from insufficient authorization checks within the REST API implementation, specifically when handling process-instance variable updates. The vulnerability allows authenticated attackers to exploit a privilege escalation path that bypasses intended access restrictions, enabling them to modify process variables that should be restricted to authorized personnel only.
The technical exploitation of this vulnerability occurs through carefully crafted REST API calls that target process instance variables within the IBM Business Process Manager framework. Attackers with valid authentication credentials can manipulate the system to update process variables without proper authorization, effectively circumventing the access control mechanisms that should govern such operations. This flaw operates at the application layer and leverages the legitimate API endpoints that are designed for authorized users to perform administrative functions, but fails to validate that the requesting user has appropriate permissions for the specific variables being modified. The vulnerability is particularly concerning because it operates within the core business process management functionality, potentially allowing attackers to alter critical workflow data that could impact business operations, compliance requirements, and data integrity.
The operational impact of CVE-2016-0349 extends beyond simple unauthorized access, as it can lead to significant business disruption and potential data compromise within enterprise environments. Process instance variables often contain sensitive business information, transactional data, or configuration parameters that are critical to business operations. An attacker exploiting this vulnerability could manipulate workflow processes, alter business logic, or inject malicious data into ongoing processes, potentially causing financial loss, regulatory compliance violations, or operational failures. The vulnerability's persistence across multiple versions of IBM Business Process Manager indicates a fundamental flaw in the access control implementation that affects organizations maintaining these systems. This type of vulnerability aligns with CWE-285, which addresses improper authorization issues, and represents a clear violation of the principle of least privilege that should govern all enterprise applications.
Organizations affected by this vulnerability should prioritize immediate remediation through the application of IBM's security patches and updates, particularly the CF201606 cumulative fix for version 8.5.7. The mitigation strategy should include comprehensive access control reviews, implementation of additional monitoring for REST API calls, and verification of user permissions within the business process management environment. Security teams should also consider implementing network segmentation to limit access to the affected systems and establish logging mechanisms to detect unauthorized API usage patterns. This vulnerability demonstrates the importance of thorough security testing of API endpoints and proper authorization validation, as highlighted in the ATT&CK framework's privilege escalation techniques. The issue underscores the need for organizations to maintain current security patches and conduct regular vulnerability assessments to identify similar access control weaknesses in their enterprise applications, particularly within workflow and business process management systems that handle sensitive business data.