CVE-2014-3682 in Jbpm-designer
Summary
by MITRE
XML external entity (XXE) vulnerability in the JBPMBpmn2ResourceImpl function in designer/bpmn2/resource/JBPMBpmn2ResourceImpl.java in jbpm-designer 6.0.x and 6.2.x allows remote attackers to read arbitrary files and possibly have other unspecified impact by importing a crafted BPMN2 file.
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Analysis
by VulDB Data Team • 04/16/2022
The CVE-2014-3682 vulnerability represents a critical XML external entity processing flaw within the jbpm-designer application ecosystem. This vulnerability specifically targets the JBPMBpmn2ResourceImpl function located in the designer/bpmn2/resource/JBPMBpmn2ResourceImpl.java file, affecting jbpm-designer versions 6.0.x and 6.2.x. The flaw stems from insufficient input validation when processing BPMN2 files, creating an avenue for malicious actors to exploit the system through carefully crafted XML entities. The vulnerability is classified under CWE-611 as an Improper Restriction of XML External Entity Reference, which directly relates to the improper handling of external entity declarations in XML processing. This issue falls squarely within the ATT&CK framework's T1213 technique category for Data from Information Repositories, as it enables unauthorized data access through system interfaces.
The technical exploitation of this vulnerability occurs when a remote attacker constructs a malicious BPMN2 file containing crafted XML external entity declarations. When the jbpm-designer application processes this file through the vulnerable JBPMBpmn2ResourceImpl function, it fails to properly restrict external entity resolution, allowing the system to read arbitrary files from the local filesystem. The attacker can leverage this capability to access sensitive information stored on the server, including configuration files, database credentials, and potentially system files that should remain protected. The vulnerability's impact extends beyond simple file reading, as it may enable additional attacks such as server-side request forgery, denial of service conditions, or even remote code execution depending on the system configuration and available file access permissions. The XXE attack vector specifically allows for the exploitation of the XML parser's ability to resolve external entities, which can be manipulated to reference local files through file:// URI schemes.
The operational impact of CVE-2014-3682 is substantial for organizations utilizing jbpm-designer in their business process management workflows. The vulnerability creates a persistent security risk that can be exploited by attackers without requiring authentication, making it particularly dangerous in environments where BPMN2 files are imported from untrusted sources or where automated file processing occurs. Organizations may experience data breaches, regulatory compliance violations, and operational disruptions when this vulnerability is exploited successfully. The attack surface expands significantly when considering that BPMN2 files are often shared between different departments or organizations, creating opportunities for attackers to deliver malicious payloads through seemingly legitimate file imports. Additionally, the vulnerability's presence in multiple versions of the software increases the potential attack surface across various organizational deployments.
Mitigation strategies for CVE-2014-3682 should prioritize immediate software updates to versions that address the XXE vulnerability within the jbpm-designer framework. Organizations must implement strict input validation and sanitization for all BPMN2 file imports, ensuring that external entity declarations are properly disabled or restricted within XML parsers. The implementation of XML parser security configurations that disable external entity resolution and DTD processing represents a fundamental defense mechanism. Network-level controls such as firewalls and intrusion detection systems should be configured to monitor for suspicious file import activities and XML parsing patterns. Additionally, organizations should establish secure file handling procedures that require manual review and validation of BPMN2 files before automated processing, implementing principle of least privilege access controls to limit the potential damage from successful exploitation attempts. Regular security assessments and penetration testing should include validation of XML processing components to ensure that similar vulnerabilities do not exist in related systems or custom implementations.