CVE-2023-40310 in PowerDesigner Client
Summary
by MITRE • 10/25/2023
SAP PowerDesigner Client - version 16.7, does not sufficiently validate BPMN2 XML document imported from an untrusted source. As a result, URLs of external entities in BPMN2 file, although not used, would be accessed during import. A successful attack could impact availability of SAP PowerDesigner Client.
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Analysis
by VulDB Data Team • 10/28/2023
SAP PowerDesigner Client version 16.7 contains a critical vulnerability that stems from insufficient validation of BPMN2 XML documents during the import process. This vulnerability falls under the category of XML External Entity processing flaws, which are commonly classified as CWE-611 in the Common Weakness Enumeration catalog. The issue arises when the application processes BPMN2 files that contain external entity declarations, even if these entities are not actively utilized during the import operation. The system's failure to properly sanitize these XML inputs creates an avenue for malicious actors to exploit the application's XML parser behavior. During the import of BPMN2 documents, the PowerDesigner Client attempts to resolve external entity references, which can lead to unintended network activity and resource consumption.
The technical implementation flaw manifests in the XML parsing mechanism that lacks proper restrictions on external entity resolution. When a maliciously crafted BPMN2 file is imported, the application's XML processor automatically attempts to access the declared external entities, potentially triggering network connections to attacker-controlled servers. This behavior represents a classic example of insecure XML processing that can be leveraged to perform resource exhaustion attacks or to redirect network traffic through the vulnerable application. The vulnerability's impact extends beyond simple information disclosure as it can consume system resources and potentially disrupt the availability of the PowerDesigner Client application. According to the ATT&CK framework, this vulnerability maps to T1212 Exploitation for Credential Access and T1499 Endpoint Termination, as it can be used to disrupt service availability.
The operational impact of this vulnerability is significant for organizations that rely on SAP PowerDesigner for business process modeling and design. Attackers could exploit this weakness to perform denial-of-service attacks against the PowerDesigner Client, potentially causing application crashes or unresponsiveness. The vulnerability is particularly concerning in enterprise environments where PowerDesigner is used extensively for critical business process documentation and modeling activities. Organizations may experience disruptions in their business process design workflows, leading to productivity losses and potential delays in process improvement initiatives. The attack vector requires minimal technical expertise to exploit, making it attractive to threat actors seeking to disrupt business operations. Additionally, the vulnerability could be combined with other attack techniques to create more sophisticated exploitation scenarios that might include information gathering or further system compromise.
Organizations should implement immediate mitigations to address this vulnerability, including restricting the import of BPMN2 files from untrusted sources and implementing network-level controls to prevent access to external entity references. The recommended approach involves configuring the XML parser to disable external entity resolution entirely, which aligns with security best practices outlined in OWASP XML External Entity Prevention Cheat Sheet. Administrators should also consider implementing network segmentation and monitoring to detect unauthorized access attempts during BPMN2 file imports. Regular updates and patches from SAP should be applied promptly to remediate this vulnerability, as the vendor has likely released security fixes to address the insecure XML processing behavior. Organizations may also benefit from implementing application whitelisting policies that restrict which BPMN2 files can be imported into the PowerDesigner Client environment.