CVE-2020-7544 in EcoStruxure Operator Terminal Expert
Summary
by MITRE • 11/20/2020
A CWE-269 Improper Privilege Management vulnerability exists in EcoStruxureª Operator Terminal Expert runtime (Vijeo XD) that could cause privilege escalation on the workstation when interacting directly with a driver installed by the runtime software of EcoStruxureª Operator Terminal Expert.
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Analysis
by VulDB Data Team • 12/09/2020
The CVE-2020-7544 vulnerability represents a critical improper privilege management flaw classified under CWE-269 within the EcoStruxureª Operator Terminal Expert runtime environment known as Vijeo XD. This vulnerability specifically targets the runtime software's interaction with drivers installed as part of the EcoStruxureª Operator Terminal Expert ecosystem, creating a pathway for unauthorized privilege escalation on affected workstations. The flaw exists at the intersection of software runtime execution and driver interaction, where insufficient privilege controls allow malicious actors to elevate their access levels beyond what should be permitted.
The technical implementation of this vulnerability stems from inadequate privilege separation mechanisms within the Vijeo XD runtime environment. When users interact directly with drivers installed by the runtime software, the system fails to properly validate or enforce access controls that should normally prevent unauthorized elevation of privileges. This weakness allows an attacker with access to the workstation to potentially execute malicious code with elevated privileges, effectively bypassing the normal security boundaries that should protect the system from unauthorized access. The vulnerability is particularly concerning because it operates at the kernel or driver level where privilege escalation can lead to complete system compromise.
Operationally, this vulnerability presents significant risks to industrial control systems and operational technology environments that rely on EcoStruxureª Operator Terminal Expert for human-machine interface operations. The impact extends beyond simple privilege escalation to potentially enable full system compromise, data exfiltration, and disruption of critical industrial processes. Attackers could leverage this vulnerability to gain unauthorized access to sensitive operational data, modify system configurations, or deploy additional malicious payloads that could persist across system reboots. The vulnerability's exploitation requires direct interaction with the driver components, making it particularly dangerous in environments where physical access or network-based attacks could provide the necessary conditions for exploitation.
Organizations utilizing EcoStruxureª Operator Terminal Expert systems should implement immediate mitigations including applying vendor-provided security patches and updates as soon as they become available. Network segmentation and access control measures should be strengthened to limit direct driver interaction capabilities and restrict access to privileged functions. Security monitoring should be enhanced to detect unusual driver interactions or privilege escalation attempts within the runtime environment. The vulnerability aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation" and demonstrates how improper privilege management can create pathways for attackers to gain elevated system access. System administrators should also consider implementing principle of least privilege controls and regularly audit driver installations to ensure only authorized components are present on critical industrial systems.