CVE-2018-18980 in Network Configuration Manager
Summary
by MITRE
An XML External Entity injection (XXE) vulnerability exists in Zoho ManageEngine Network Configuration Manager and OpManager before 12.3.214 via the RequestXML parameter in a /devices/ProcessRequest.do GET request. For example, the attacker can trigger the transmission of local files to an arbitrary remote FTP server.
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Analysis
by VulDB Data Team • 04/10/2020
The vulnerability identified as CVE-2018-18980 represents a critical XML External Entity injection flaw affecting Zoho ManageEngine Network Configuration Manager and OpManager versions prior to 12.3.214. This weakness resides in the application's handling of XML data through the RequestXML parameter within the /devices/ProcessRequest.do GET request endpoint. The vulnerability stems from insufficient input validation and sanitization of XML content, allowing malicious actors to manipulate the application's XML parser behavior. The flaw enables attackers to exploit the underlying XML processing mechanisms to access local system resources and exfiltrate sensitive data.
The technical exploitation of this XXE vulnerability follows established patterns documented in CWE-611 and CWE-776, where external entity references in XML documents are improperly handled. Attackers can construct malicious XML payloads that reference local files or network resources, causing the vulnerable application to process these entities and potentially transmit confidential information to remote servers. The specific implementation allows for arbitrary file access through the XML parser's ability to resolve external entities, making it possible for threat actors to retrieve system files, configuration data, or sensitive documents stored locally on the target server. This vulnerability operates at the application layer and demonstrates how improper XML parsing can lead to information disclosure and potential data exfiltration.
The operational impact of this vulnerability extends beyond simple data theft, as it can facilitate further exploitation within the network environment. Successful exploitation allows attackers to access local files that may contain network configuration details, device credentials, or other sensitive operational data. The ability to transmit this information to remote FTP servers creates a persistent threat vector for data exfiltration and potential reconnaissance activities. Organizations using affected versions of ManageEngine products face significant risk of unauthorized data access and potential compromise of their network infrastructure management systems. The vulnerability's impact is particularly severe in environments where these tools are used for critical network device management, as they often contain privileged access information and operational configurations.
Mitigation strategies for CVE-2018-18980 should prioritize immediate patching of affected systems to version 12.3.214 or later, which addresses the XXE vulnerability through proper XML input validation and entity resolution controls. Organizations should implement network segmentation and access controls to limit exposure of affected applications to untrusted networks. Input validation mechanisms should be strengthened to reject or sanitize XML content before processing, and the application should be configured to disable external entity resolution in XML parsers. Security monitoring should include detection of unusual file access patterns or outbound network connections that may indicate exploitation attempts. Additionally, implementing web application firewalls and security scanning tools can help identify and block malicious XML payloads attempting to exploit this vulnerability. The remediation aligns with ATT&CK technique T1071.004 for application layer protocol usage and T1567.002 for exfiltration over web service, providing both defensive and detection capabilities against similar XXE attack vectors.