CVE-2018-7764 in U.motion Builder
Summary
by MITRE
The vulnerability exists within runscript.php applet in Schneider Electric U.motion Builder software versions prior to v1.3.4. There is a directory traversal vulnerability in the processing of the 's' parameter of the applet.
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Analysis
by VulDB Data Team • 02/24/2020
The vulnerability identified as CVE-2018-7764 resides within the Schneider Electric U.motion Builder software ecosystem, specifically targeting the runscript.php applet component. This directory traversal flaw affects versions prior to v1.3.4 and represents a critical security weakness that can be exploited by malicious actors to access unauthorized file systems. The vulnerability manifests through improper input validation within the 's' parameter processing mechanism, creating an avenue for attackers to manipulate file access paths and potentially gain access to sensitive system resources.
This directory traversal vulnerability falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory. The flaw allows attackers to traverse directory structures by manipulating the 's' parameter in the runscript.php applet, potentially enabling them to read arbitrary files from the server's file system. The vulnerability is particularly concerning because it can be exploited without authentication, making it accessible to anyone who can interact with the affected software interface.
The operational impact of this vulnerability extends beyond simple file access, as it can enable attackers to escalate privileges and potentially execute arbitrary code on the affected system. Attackers could leverage this weakness to access configuration files, source code repositories, database credentials, or other sensitive information stored within the application's directory structure. The implications are severe for industrial control systems where Schneider Electric U.motion Builder is deployed, as these systems often manage critical infrastructure operations and security breaches could lead to operational disruptions or safety hazards.
Mitigation strategies for CVE-2018-7764 should prioritize immediate software updates to version 1.3.4 or later, which contain the necessary patches to address the directory traversal vulnerability. Organizations should also implement network segmentation and access controls to limit exposure of the affected software to untrusted networks. Additional protective measures include input validation enforcement, parameter sanitization, and regular security assessments of industrial control system components. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation could enable attackers to execute malicious commands through the compromised file access paths. Security teams should also monitor for indicators of compromise related to unusual file access patterns or unauthorized directory traversal attempts in system logs and network traffic analysis.