CVE-2018-8840 in InduSoft Web Studio
Summary
by MITRE
A remote attacker could send a carefully crafted packet in InduSoft Web Studio v8.1 and prior versions, and/or InTouch Machine Edition 2017 v8.1 and prior versions during a tag, alarm, or event related action such as read and write, which may allow remote code execution.
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Analysis
by VulDB Data Team • 01/27/2020
The vulnerability identified as CVE-2018-8840 represents a critical remote code execution flaw affecting InduSoft Web Studio v8.1 and earlier versions, as well as InTouch Machine Edition 2017 v8.1 and prior releases. This security weakness stems from insufficient input validation mechanisms within the industrial automation software platforms, creating a pathway for malicious actors to execute arbitrary code on affected systems. The vulnerability specifically manifests during tag, alarm, or event related operations including read and write functions, making it particularly dangerous in industrial control environments where these operations are frequent and critical to system functionality.
The technical nature of this flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-787, indicating out-of-bounds write vulnerabilities. Attackers can exploit this weakness by crafting specially designed network packets that trigger buffer overflow conditions when processed by the affected software components. The vulnerability exists in the handling of user-supplied data during industrial communication protocols, where the software fails to properly validate or sanitize incoming data before processing tag-related operations. This allows an unauthenticated remote attacker to inject malicious code that executes with the privileges of the affected application, typically running with elevated system permissions in industrial environments.
The operational impact of CVE-2018-8840 extends beyond simple remote code execution, as it fundamentally compromises the integrity and availability of industrial control systems. In manufacturing and critical infrastructure environments, this vulnerability could enable attackers to manipulate production processes, alter operational parameters, or even cause physical damage to equipment. The remote nature of the exploit means that attackers do not require physical access to the systems, making the attack surface much broader than traditional network-based threats. Industrial environments often have limited network segmentation and may lack robust intrusion detection systems, amplifying the potential damage from such an exploit. The vulnerability affects both the web-based interface and the underlying industrial automation protocols, creating multiple attack vectors for threat actors.
Mitigation strategies for this vulnerability should prioritize immediate software updates and patches from the vendor, as this represents a known exploit that has been documented in security advisories. Organizations should implement network segmentation to isolate industrial control systems from general network access, following the principle of least privilege as outlined in the NIST Cybersecurity Framework. Additionally, deploying intrusion detection systems specifically configured to monitor for known attack patterns associated with industrial control system exploits can provide early warning capabilities. The ATT&CK framework categorizes this type of vulnerability under T1210 - Exploitation of Remote Services, emphasizing the need for proper network access controls and service hardening. Regular security assessments of industrial control systems should include vulnerability scanning specifically targeting known industrial protocol vulnerabilities, and organizations should maintain updated incident response procedures that account for potential compromise of operational technology environments.