CVE-2018-14815 in V-Server
Summary
by MITRE
Fuji Electric V-Server 4.0.3.0 and prior, Several out-of-bounds write vulnerabilities have been identified, which may allow remote code execution.
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Analysis
by VulDB Data Team • 06/23/2020
The vulnerability identified in Fuji Electric V-Server version 4.0.3.0 and prior represents a critical security flaw that exposes systems to remote code execution through multiple out-of-bounds write conditions. This issue affects a widely used industrial control system that manages various operational technology environments, making it particularly concerning for critical infrastructure deployments. The out-of-bounds write vulnerabilities occur when the software fails to properly validate input data before processing, leading to memory corruption that can be exploited by remote attackers to execute arbitrary code on affected systems.
These memory corruption vulnerabilities stem from insufficient bounds checking mechanisms within the V-Server software's data processing routines. When malicious input is received through network communications, the application does not adequately verify array indices or buffer limits, allowing attackers to write data beyond allocated memory regions. This fundamental flaw creates opportunities for attackers to overwrite critical memory locations including function pointers, return addresses, or other control data structures. The vulnerability landscape for such issues aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-787, which addresses out-of-bounds writes in memory operations. The specific nature of these vulnerabilities places them within the ATT&CK framework under T1059.007 for command and script interpreter and T1068 for exploit for privilege escalation.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass potential system compromise and operational technology disruption. Industrial environments relying on Fuji Electric V-Server systems face significant risk of unauthorized access, data manipulation, and potential physical system control interference. Attackers could leverage these vulnerabilities to gain persistent access to industrial control networks, potentially leading to production disruption, safety system compromise, or unauthorized data access. The remote nature of the exploit means that attackers do not require physical access to the systems, making the attack surface significantly larger and more difficult to defend against. Organizations using these systems may experience cascading effects throughout their operational technology infrastructure, as compromised V-Server instances could serve as entry points for broader network infiltration.
Mitigation strategies for this vulnerability must address both immediate protection and long-term system hardening. The primary recommendation involves upgrading to the latest available version of Fuji Electric V-Server software that contains patches for these out-of-bounds write conditions. Organizations should also implement network segmentation to limit access to V-Server systems, deploy intrusion detection systems to monitor for exploitation attempts, and apply network access controls to restrict communication to necessary endpoints only. Additionally, organizations should conduct thorough vulnerability assessments of their operational technology environments to identify other potential entry points and ensure that all industrial control systems receive regular security updates and patches. The remediation process should include comprehensive testing of patches in controlled environments before deployment to production systems to avoid operational disruptions.