CVE-2015-3948 in WebAccess
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Advantech WebAccess before 8.1 allows remote authenticated users to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 07/23/2018
The CVE-2015-3948 vulnerability represents a critical cross-site scripting flaw discovered in Advantech WebAccess software versions prior to 8.1. This vulnerability falls under the CWE-79 category of Cross-Site Scripting and specifically affects the web-based interface of the industrial automation and SCADA system. The vulnerability permits remote authenticated attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers, potentially leading to unauthorized access to sensitive information and system compromise.
The technical nature of this vulnerability stems from inadequate input validation and output encoding within the WebAccess web interface components. Attackers with valid authentication credentials can exploit this weakness through unspecified vectors that likely involve user-controllable input fields or parameters within the web application. The flaw exists because the application fails to properly sanitize or escape user-supplied data before rendering it in web pages, creating an environment where malicious scripts can be injected and executed in the browser context of legitimate users.
From an operational perspective, this vulnerability poses significant risks to industrial control systems that rely on Advantech WebAccess for monitoring and control operations. The authenticated nature of the attack means that an attacker must first obtain valid credentials, but once achieved, they can leverage this vulnerability to escalate their privileges or gain unauthorized access to sensitive operational data. The impact extends beyond simple data theft as the injected scripts could potentially manipulate control functions, disrupt operations, or serve as a foothold for further attacks within the industrial network infrastructure.
Organizations utilizing Advantech WebAccess should prioritize immediate remediation through the installation of patches released by Advantech, specifically upgrading to version 8.1 or later. Additional mitigations include implementing network segmentation to limit access to the WebAccess interface, enforcing strict access controls and authentication mechanisms, and deploying web application firewalls to monitor and filter suspicious traffic. The vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, specifically web shell execution, and represents a common vector for lateral movement in industrial environments. Security teams should also conduct comprehensive vulnerability assessments to identify any other potentially affected systems within their industrial control network and implement proper input validation controls to prevent similar issues in other applications.