CVE-2020-12684 in Clear Reports 2019
Summary
by MITRE
XXE injection can occur in i-net Clear Reports 2019 19.0.287 (Designer), as used in i-net HelpDesk and other products, when XML input containing a reference to an external entity is processed by a weakly configured XML parser.
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Analysis
by VulDB Data Team • 11/02/2020
The vulnerability CVE-2020-12684 represents a critical XML external entity injection flaw discovered in i-net Clear Reports 2019 version 19.0.287, specifically within the Designer component that is also utilized by i-net HelpDesk and other related products. This weakness arises from improper configuration of the XML parser component that processes incoming XML data, creating an avenue for malicious actors to exploit the system through crafted XML input containing external entity references. The vulnerability falls under the category of CWE-611, which specifically addresses Improper Restriction of XML External Entity Reference, making it a well-documented and serious security concern that has been recognized by the Common Weakness Enumeration project. The flaw enables attackers to manipulate how the system processes XML data, potentially leading to unauthorized access to internal resources and data exfiltration.
The technical implementation of this vulnerability occurs when the XML parser within the i-net Clear Reports application fails to properly restrict or disable external entity resolution during XML processing. This weak configuration allows attackers to include external entity references in their XML input that can point to internal network resources, file systems, or even trigger remote code execution through specific payload constructions. The parser's inability to properly validate and sanitize XML input creates a pathway for attackers to perform server-side request forgery attacks, where the application will attempt to resolve external entities and potentially access internal systems that should remain isolated from external threats. This particular implementation demonstrates a failure in the principle of least privilege and proper input validation, as the XML parser should have been configured to reject or properly handle external entity references.
The operational impact of CVE-2020-12684 extends beyond simple data exposure, potentially enabling attackers to perform reconnaissance on internal network infrastructure, access sensitive files, or even escalate privileges within the affected system. When exploited, this vulnerability can allow unauthorized access to internal systems that are typically protected by firewalls and network segmentation, as the XML parser will make outbound connections to resolve external entities. The attack surface is particularly concerning given that i-net Clear Reports is used in enterprise environments where sensitive business data and internal resources are commonly processed through such reporting tools. This vulnerability can be leveraged to perform data exfiltration, system enumeration, and potentially serve as a stepping stone for more sophisticated attacks within the network. The weakness also aligns with ATT&CK technique T1071.004 for Application Layer Protocol: DNS, as attackers may use DNS resolution through external entity references to bypass network security controls.
Organizations utilizing i-net Clear Reports 2019 19.0.287 should immediately implement mitigations including disabling external entity resolution in all XML parsers, implementing proper input validation and sanitization, and configuring XML parsers to use secure defaults that prevent loading external resources. The recommended approach involves updating to patched versions of the software, as i-net has released updates addressing this vulnerability. Additionally, network segmentation should be implemented to limit access to systems processing XML input, and security monitoring should be enhanced to detect unusual outbound network connections that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of secure XML processing configurations and proper application security hardening, particularly in enterprise reporting and data processing applications where the volume and sensitivity of data processed creates significant risk if compromised. Organizations should also consider implementing web application firewalls and input validation controls to prevent exploitation of similar vulnerabilities in other applications that may process XML data.