CVE-2020-11641 in SiteManager
Summary
by MITRE • 10/15/2020
A local file inclusion vulnerability in B&R SiteManager versions
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 11/20/2020
The local file inclusion vulnerability identified as CVE-2020-11641 affects B&R SiteManager software, representing a critical security flaw that allows attackers to include and execute arbitrary local files on the target system. This vulnerability stems from inadequate input validation and sanitization within the application's file handling mechanisms, creating an exploitable path for malicious actors to gain unauthorized access to system resources. The flaw exists in the software's processing of user-supplied file paths without proper validation, enabling attackers to manipulate file inclusion parameters and potentially execute malicious code with the privileges of the running application.
The technical implementation of this vulnerability falls under CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. Attackers can exploit this weakness by crafting malicious file paths that bypass normal access controls and gain access to sensitive system files, configuration data, or other resources that should remain protected. The vulnerability specifically affects B&R SiteManager versions where the application fails to properly validate file paths before processing them, allowing attackers to reference files outside the intended directory structure. This weakness creates an attack surface that can be leveraged for privilege escalation, data exfiltration, or system compromise depending on the application's execution context and permissions.
The operational impact of CVE-2020-11641 extends beyond simple unauthorized file access, as it can enable attackers to escalate their privileges and potentially take full control of the affected system. When exploited successfully, this vulnerability allows for arbitrary code execution, which can lead to complete system compromise, data theft, or disruption of critical operations. The vulnerability is particularly concerning in industrial control environments where B&R SiteManager is commonly deployed, as it could potentially affect operational technology systems and create opportunities for attackers to disrupt critical infrastructure operations. The attack vector typically involves manipulating web parameters or file upload mechanisms to include malicious local files, making it difficult to detect and prevent without proper input validation measures.
Organizations should implement immediate mitigations including applying vendor-provided patches, implementing strict input validation controls, and configuring proper access controls to limit file inclusion capabilities. The ATT&CK framework categorizes this vulnerability under T1059.007 for command and scripting interpreter and T1566 for credential access, highlighting the potential for lateral movement and privilege escalation once the initial compromise occurs. Security measures should include network segmentation to limit access to affected systems, regular security assessments to identify similar vulnerabilities, and monitoring for unusual file access patterns that may indicate exploitation attempts. Additionally, implementing web application firewalls and input sanitization controls can help prevent exploitation attempts while organizations await official patches from B&R to address the underlying vulnerability in their SiteManager software implementations.