CVE-2014-0986 in WebAccess
Summary
by MITRE
Stack-based buffer overflow in Advantech WebAccess (formerly BroadWin WebAccess) 7.2 allows remote attackers to execute arbitrary code via the GotoCmd parameter.
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Analysis
by VulDB Data Team • 06/07/2017
The vulnerability identified as CVE-2014-0986 represents a critical stack-based buffer overflow flaw within Advantech WebAccess 7.2, formerly known as BroadWin WebAccess. This industrial automation and SCADA software platform is widely deployed in critical infrastructure environments for remote monitoring and control of industrial processes. The vulnerability specifically affects the handling of the GotoCmd parameter, which is used for navigation and command execution within the web interface. The flaw resides in the software's input validation mechanisms where untrusted data from network requests is directly copied to a fixed-size stack buffer without proper bounds checking, creating an exploitable condition that can be leveraged by remote attackers.
The technical exploitation of this vulnerability occurs when an attacker sends a specially crafted HTTP request containing an overly long GotoCmd parameter value. The application fails to validate the length of this parameter before copying it to a stack buffer, which typically has a fixed size of several hundred bytes. When the input exceeds the buffer capacity, it overflows into adjacent memory locations, potentially overwriting the return address of the calling function or other critical stack data. This memory corruption allows attackers to redirect program execution flow to malicious code injected into the buffer, enabling arbitrary code execution with the privileges of the WebAccess service account. The vulnerability is particularly concerning because it operates over standard HTTP protocols and requires no authentication for exploitation, making it accessible to any remote attacker with network connectivity to the target system.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with persistent access to industrial control systems that manage critical infrastructure operations. The affected Advantech WebAccess 7.2 platform is commonly used in manufacturing plants, power generation facilities, water treatment systems, and other environments where operational technology (OT) security is paramount. Successful exploitation could lead to complete system compromise, allowing attackers to manipulate industrial processes, access sensitive operational data, or establish persistent backdoors for future attacks. The vulnerability also creates potential for lateral movement within network segments where the software is deployed, as attackers could use the compromised system as a foothold to access other connected industrial devices and systems. This risk is particularly elevated in environments where OT and IT networks are not properly segmented, as the compromised WebAccess server could serve as an entry point to broader enterprise networks.
Organizations should implement immediate mitigations including applying the vendor-provided patches and updates released to address this vulnerability, which typically involve input validation improvements and buffer size restrictions for the GotoCmd parameter. Network segmentation and access controls should be enforced to limit exposure of the WebAccess service to untrusted networks, while firewall rules should restrict access to the specific ports used by the application. Additionally, implementing network monitoring solutions that can detect anomalous traffic patterns or large parameter values in HTTP requests can help identify potential exploitation attempts. The vulnerability aligns with CWE-121 stack-based buffer overflow, which is classified as a high-severity weakness in the Common Weakness Enumeration catalog, and represents a technique commonly used in the attack lifecycle as documented in MITRE ATT&CK framework under the T1203 Reconnaissance category and T1059 Command and Scripting Interpreter tactics. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other industrial control system applications, as this type of memory corruption vulnerability remains prevalent in legacy industrial software due to insufficient security testing during development phases.