CVE-2020-7569 in EcoStruxure Building Operation WebReports
Summary
by MITRE • 11/20/2020
A CWE-434 Unrestricted Upload of File with Dangerous Type vulnerability exists in EcoStruxure Building Operation WebReports V1.9 - V3.1 that could cause an authenticated remote user being able to upload arbitrary files due to incorrect verification of user supplied files and achieve remote code execution.
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Analysis
by VulDB Data Team • 12/09/2020
The vulnerability identified as CVE-2020-7569 represents a critical security flaw in EcoStruxure Building Operation WebReports versions 1.9 through 3.1, classified under CWE-434 which specifically addresses unrestricted file uploads with dangerous types. This weakness stems from inadequate validation mechanisms that fail to properly verify the nature and content of files uploaded by authenticated users. The flaw allows an attacker with valid credentials to bypass security controls and upload malicious files to the target system, creating a significant attack surface that can be exploited for remote code execution.
The technical implementation of this vulnerability occurs through the web application's file upload functionality where user-supplied files are not adequately filtered or validated before being accepted into the system. The application fails to implement proper file type checking, content validation, or sandboxing mechanisms that would normally prevent the upload of executable or script files. This weakness enables attackers to upload files with dangerous extensions such as .jsp, .php, .asp, or .exe that can be executed on the server, potentially allowing full system compromise. The vulnerability specifically affects the WebReports module within the EcoStruxure Building Operation platform, which is designed for building management and monitoring purposes.
From an operational perspective, this vulnerability presents a severe risk to organizations using the affected software, as it allows authenticated remote code execution without requiring additional privileges or complex exploitation techniques. The impact extends beyond simple file upload capabilities, as successful exploitation can lead to complete system compromise, data exfiltration, and persistence mechanisms within the network. Attackers can leverage this vulnerability to establish backdoors, deploy malware, or use the compromised system as a launch point for further attacks against other network resources. The vulnerability's remote execution capability means that attackers do not need physical access to the system, making it particularly dangerous in enterprise environments where network access is typically restricted.
Organizations should implement immediate mitigations including strict file type validation, content inspection, and the removal of dangerous file extensions from upload capabilities. The solution involves deploying proper input validation controls that check file headers, extensions, and content signatures against a whitelist of acceptable file types. Security measures should include implementing proper file storage separation, disabling execution permissions on uploaded files, and enforcing strict access controls. The mitigation strategy should align with industry standards such as the OWASP Top Ten and NIST cybersecurity frameworks, particularly focusing on secure coding practices and input validation controls. Additionally, organizations should consider network segmentation, monitoring for suspicious file upload activities, and regular security assessments to identify and remediate similar vulnerabilities across their infrastructure.
This vulnerability demonstrates the critical importance of proper file upload validation in web applications and aligns with ATT&CK technique T1190 which covers exploit for client execution through malicious file uploads. The attack surface created by this flaw can be exploited through various vectors including web application interfaces, potentially leading to privilege escalation and lateral movement within the network infrastructure. Organizations should prioritize patching affected systems and implementing comprehensive security controls to prevent similar vulnerabilities from being exploited in their environments.