CVE-2017-12719 in WebAccess
Summary
by MITRE
An Untrusted Pointer Dereference issue was discovered in Advantech WebAccess versions prior to V8.2_20170817. A remote attacker is able to execute code to dereference a pointer within the program causing the application to become unavailable.
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Analysis
by VulDB Data Team • 12/04/2019
The vulnerability identified as CVE-2017-12719 represents a critical untrusted pointer dereference flaw within Advantech WebAccess software versions prior to V8.2_20170817. This issue falls under the broader category of memory safety vulnerabilities and is classified as CWE-476, which specifically addresses NULL pointer dereference conditions. The flaw exists within the application's handling of memory pointers, creating a scenario where an attacker can manipulate pointer values to cause unexpected behavior in the software's execution flow.
The technical implementation of this vulnerability allows remote attackers to exploit the untrusted pointer dereference by crafting malicious input that manipulates how the application processes memory addresses. When the WebAccess application encounters a pointer that has not been properly validated or initialized, it attempts to dereference this untrusted pointer, potentially leading to arbitrary code execution. This type of vulnerability is particularly dangerous because it enables remote code execution without requiring authentication, making it an attractive target for attackers seeking to compromise industrial control systems. The flaw demonstrates poor input validation practices and inadequate pointer management within the application's memory handling mechanisms.
The operational impact of this vulnerability extends beyond simple application instability, as it creates a pathway for complete system compromise within industrial environments where Advantech WebAccess is deployed. When an attacker successfully exploits this vulnerability, they can execute arbitrary code on the target system, potentially gaining full control over the industrial control processes that rely on WebAccess for monitoring and management. This poses significant risks to critical infrastructure sectors including manufacturing, energy, and utilities where such systems control essential operations. The vulnerability essentially provides a backdoor that allows attackers to manipulate the industrial processes, potentially causing physical damage, operational disruptions, or security breaches that could affect national security infrastructure.
Organizations utilizing Advantech WebAccess software should immediately implement mitigations including updating to version V8.2_20170817 or later, which contains the necessary patches to address the untrusted pointer dereference issue. Network segmentation and access controls should be implemented to limit exposure of the affected systems to untrusted networks. Additionally, monitoring for suspicious network traffic patterns and anomalous behavior within the industrial control systems can help detect potential exploitation attempts. The vulnerability aligns with tactics described in the MITRE ATT&CK framework under the 'Execution' and 'Persistence' domains, as it enables initial access and potential long-term system compromise. Regular security assessments and vulnerability management programs should include specific checks for this vulnerability in industrial control system environments to prevent exploitation and maintain operational resilience against advanced persistent threats.