CVE-2019-14715 in Pinpad Payment Terminal
Summary
by MITRE • 10/23/2020
Verifone Pinpad Payment Terminals allow undocumented physical access to the system via an SBI bootloader memory write operation.
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Analysis
by VulDB Data Team • 11/27/2020
The vulnerability identified as CVE-2019-14715 affects Verifone Pinpad Payment Terminals and represents a critical security flaw that undermines the integrity of payment processing devices. This vulnerability stems from an undocumented physical access mechanism that allows attackers to gain unauthorized system access through a specific SBI bootloader memory write operation. The flaw exists within the terminal's firmware design and represents a significant weakness in the device's security architecture, particularly concerning physical attack surfaces that are not properly secured or documented.
The technical implementation of this vulnerability involves exploiting a backdoor mechanism within the SBI bootloader that enables memory write operations without proper authentication or authorization. This allows an attacker with physical access to the device to modify critical system components, potentially enabling code injection, firmware manipulation, or complete system compromise. The SBI bootloader serves as a critical entry point for device initialization and firmware updates, making this vulnerability particularly dangerous as it can be leveraged to gain persistent access to the payment terminal's core operations. The vulnerability falls under CWE-254 which addresses security weaknesses in the SBI bootloader and firmware update mechanisms, specifically concerning inadequate access control and authentication.
The operational impact of CVE-2019-14715 extends beyond simple unauthorized access to encompass potential financial fraud, data breaches, and compromise of sensitive payment information. Payment terminals are critical infrastructure components that handle confidential cardholder data and transaction information, making them prime targets for attackers seeking to exploit weaknesses in payment processing systems. An attacker who successfully exploits this vulnerability could potentially install malicious code that intercepts payment transactions, modifies transaction amounts, or creates backdoors for future access. The vulnerability also poses significant risk to point-of-sale environments where physical access to terminals may be possible, including retail locations, restaurants, and service establishments.
Mitigation strategies for this vulnerability require a multi-layered approach that addresses both physical and logical security controls. Organizations should implement strict physical access controls to payment terminals, including locked enclosures, tamper-evident seals, and restricted access areas. Firmware updates should be applied immediately when available from Verifone, and system administrators should implement proper change management procedures to prevent unauthorized modifications. The vulnerability aligns with ATT&CK technique T1542.001 which covers the exploitation of boot and firmware attacks, emphasizing the need for robust firmware integrity checks and secure boot mechanisms. Additionally, organizations should consider implementing network monitoring solutions to detect unusual activity patterns that might indicate exploitation attempts, and establish regular security assessments to identify similar vulnerabilities in other payment processing equipment.