CVE-2017-12796 in OpenMRS
Summary
by MITRE
The Reporting Compatibility Add On before 2.0.4 for OpenMRS, as distributed in OpenMRS Reference Application before 2.6.1, does not authenticate users when deserializing XML input into ReportSchema objects. The result is that remote unauthenticated users are able to execute operating system commands by crafting malicious XML payloads, as demonstrated by a single admin/reports/reportSchemaXml.form request.
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Analysis
by VulDB Data Team • 01/20/2021
The vulnerability CVE-2017-12796 represents a critical security flaw in the OpenMRS reporting compatibility add-on that affected versions prior to 2.0.4. This issue resides within the OpenMRS Reference Application ecosystem, specifically in versions before 2.6.1, creating a dangerous path for unauthorized remote exploitation. The flaw manifests in the deserialization process of XML input data, where the system fails to validate user authentication before processing ReportSchema objects. This authentication bypass creates a severe attack vector that allows any remote user to execute arbitrary operating system commands through carefully crafted XML payloads. The vulnerability is particularly concerning because it operates at the core of the application's reporting functionality, which is typically accessed through the admin/reports/reportSchemaXml.form endpoint.
The technical implementation of this vulnerability stems from improper input validation and deserialization practices within the OpenMRS framework. When the system processes XML data containing ReportSchema objects, it performs deserialization without verifying the identity or authorization status of the requesting user. This design flaw aligns with CWE-502, which describes "Deserialization of Untrusted Data" as a critical weakness that can lead to remote code execution when untrusted data is processed without proper validation. The vulnerability essentially allows attackers to inject malicious XML content that, when deserialized, triggers command execution on the underlying operating system. The attack surface is further expanded by the fact that this occurs within a web application context where users may not be properly authenticated before processing potentially malicious input.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables full system compromise through remote code execution. An attacker can craft XML payloads that contain malicious commands, which are then executed with the privileges of the application server process. This scenario creates a significant risk for healthcare organizations that rely on OpenMRS for patient data management, as unauthorized access could lead to data breaches, system corruption, or complete service disruption. The vulnerability affects the integrity and confidentiality of healthcare data, which is particularly concerning given the sensitive nature of medical information and the regulatory requirements governing its protection. Organizations using affected versions of OpenMRS face potential compliance violations under healthcare data protection regulations such as HIPAA, as the vulnerability creates an unauthenticated attack path that could result in unauthorized access to protected health information.
Mitigation strategies for CVE-2017-12796 require immediate patching of the affected OpenMRS components to version 2.0.4 or later of the Reporting Compatibility Add On and 2.6.1 or later of the Reference Application. Organizations should implement network-level controls to restrict access to the vulnerable endpoint admin/reports/reportSchemaXml.form, limiting exposure to trusted networks only. Additionally, input validation measures should be strengthened to ensure that all XML data is properly sanitized and authenticated before processing, following the principle of least privilege. Security teams should monitor for exploitation attempts through log analysis and implement intrusion detection systems to identify suspicious XML payload patterns. The vulnerability also highlights the importance of secure coding practices and regular security assessments, particularly for applications handling sensitive data in healthcare environments where compliance with industry standards is mandatory. Organizations should consider implementing web application firewalls and additional authentication layers to provide defense-in-depth against similar vulnerabilities.