CVE-2018-17766 in Telium 2
Summary
by MITRE
Ingenico Telium 2 POS Telium2 OS allow bypass of file-reading restrictions via the NTPT3 protocol. This is fixed in Telium 2 SDK v9.32.03 patch N.
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Analysis
by VulDB Data Team • 09/10/2020
The vulnerability identified as CVE-2018-17766 affects the Ingenico Telium 2 Point of Sale system operating on the Telium2 OS platform. This security flaw resides within the NTPT3 protocol implementation which governs communication between the POS terminal and external systems. The vulnerability represents a significant security weakness that allows unauthorized access to restricted file systems through protocol manipulation. The issue specifically enables attackers to bypass normal file access controls that should prevent reading of sensitive system files or restricted data directories. This type of vulnerability falls under the category of improper access control as defined by CWE-284, where the system fails to properly enforce access restrictions on file operations.
The technical implementation of this vulnerability stems from insufficient validation within the NTPT3 protocol handler. When the Telium2 OS processes incoming protocol commands, it fails to adequately verify the authenticity and authorization level of requests attempting to access file system resources. This allows malicious actors to craft specially formatted NTPT3 protocol messages that appear legitimate to the system but actually request access to files that should be restricted. The vulnerability is particularly concerning because it operates at a protocol level rather than an application level, making it more difficult to detect and mitigate through traditional application security measures.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it could potentially enable attackers to extract sensitive information from POS terminals. This includes transaction data, cryptographic keys, system configuration files, and other confidential information that could be used for further attacks or financial fraud. The vulnerability affects retail environments where POS terminals are connected to networks and may be accessible to unauthorized personnel. Attackers could exploit this weakness to gain insights into the internal workings of the payment processing system, potentially leading to more sophisticated attacks such as man-in-the-middle operations or credential theft. According to ATT&CK framework, this vulnerability maps to T1071.004 for application layer protocol usage and T1005 for data from local system.
The fix for this vulnerability was implemented through the Telium 2 SDK v9.32.03 patch N release, which addresses the protocol validation logic and strengthens the access control mechanisms within the NTPT3 implementation. Organizations should immediately implement this patch across all affected Telium 2 POS terminals to prevent exploitation. System administrators should also conduct thorough security assessments of their POS environments to identify any potential unauthorized access that may have occurred before patching. Additionally, network segmentation and monitoring should be enhanced to detect unusual protocol activity that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date security patches in embedded systems and demonstrates how protocol-level flaws can create significant security risks in payment processing environments.