CVE-2021-34561 in WirelessHART-Gateway
Summary
by MITRE • 08/31/2021
In PEPPERL+FUCHS WirelessHART-Gateway
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Analysis
by VulDB Data Team • 09/03/2021
The vulnerability identified as CVE-2021-34561 affects the PEPPERL+FUCHS WirelessHART-Gateway device, representing a critical security flaw that undermines the integrity and confidentiality of industrial wireless communication systems. This gateway serves as a crucial component in industrial automation environments, facilitating wireless data transmission between field devices and control systems using the WirelessHART protocol. The affected device operates within critical infrastructure sectors including oil and gas, chemical processing, and manufacturing facilities where reliable and secure communication is paramount for operational safety and business continuity.
The technical flaw manifests as a remote code execution vulnerability stemming from improper input validation within the gateway's web interface. Attackers can exploit this weakness by sending maliciously crafted HTTP requests to the device's web server, which then processes these inputs without adequate sanitization or authentication checks. The vulnerability specifically relates to buffer overflow conditions in the handling of HTTP headers and parameters, allowing malicious actors to inject and execute arbitrary code on the affected device. This flaw exists due to insufficient bounds checking and improper memory management within the web server component, creating a path for attackers to gain unauthorized access to the system's command execution capabilities.
The operational impact of this vulnerability extends far beyond simple network compromise, as it enables attackers to completely take control of the WirelessHART-Gateway device and potentially compromise the entire industrial network it serves. Once exploited, attackers can modify configuration settings, intercept and manipulate wireless communication between field devices, disable security features, or establish persistent backdoors for future access. The implications are particularly severe in industrial environments where the gateway acts as a bridge between safety-critical systems and the broader network infrastructure, potentially allowing attackers to disrupt production processes, compromise data integrity, or even cause physical damage to equipment through manipulated control signals. This vulnerability directly violates the principle of least privilege and can lead to cascading security failures throughout the industrial control system architecture.
Mitigation strategies for CVE-2021-34561 should encompass both immediate defensive measures and long-term architectural improvements. Organizations must implement network segmentation to isolate the affected gateway from critical systems, deploy intrusion detection systems to monitor for suspicious HTTP traffic patterns, and apply manufacturer-provided security patches as soon as they become available. The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and maps to ATT&CK technique T1210 for exploitation of remote services. Additional protective measures include disabling unnecessary network services, implementing strong access controls for the web interface, and conducting regular security assessments of industrial network components. Organizations should also establish incident response procedures specifically tailored for industrial control system environments and consider implementing zero-trust network architectures to minimize the attack surface of critical infrastructure components.