CVE-2019-9019 in Entertainment System
Summary
by MITRE
The British Airways Entertainment System, as installed on Boeing 777-36N(ER) and possibly other aircraft, does not prevent the USB charging/data-transfer feature from interacting with USB keyboard and mouse devices, which allows physically proximate attackers to conduct unanticipated attacks against Entertainment applications, as demonstrated by using mouse copy-and-paste actions to trigger a Chat buffer overflow or possibly have unspecified other impact.
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Analysis
by VulDB Data Team • 07/19/2023
The British Airways Entertainment System represents a critical security vulnerability within aviation cybersecurity infrastructure that demonstrates the dangerous intersection of physical access and digital attack surfaces. This vulnerability exists in the entertainment system installed on Boeing 777-36N(ER) aircraft and potentially affects other aircraft models, creating a significant risk to aviation safety and passenger data integrity. The flaw stems from inadequate isolation mechanisms between the entertainment system's USB ports and the underlying operational systems that control aircraft functions. The vulnerability specifically targets the USB charging and data-transfer feature which fails to properly segment or restrict interactions with keyboard and mouse devices, creating an attack vector that can be exploited by adversaries positioned within physical proximity to the aircraft.
The technical implementation of this vulnerability involves a fundamental lack of input validation and device isolation within the entertainment system's USB subsystem. When USB keyboard and mouse devices are connected, the system does not properly authenticate or restrict the capabilities of these devices, allowing them to interact with the entertainment applications at a level that should be strictly controlled. This creates a scenario where malicious actors can leverage standard peripheral devices to inject commands or data into the entertainment system's buffer management functions. The demonstration of the Chat buffer overflow attack shows how copy-and-paste actions from a mouse device can trigger memory corruption within the entertainment application, potentially leading to arbitrary code execution or system instability. This vulnerability aligns with CWE-122, which describes buffer overflow conditions where more data is written to a buffer than it can hold, and represents a classic example of insufficient input validation in embedded systems.
The operational impact of this vulnerability extends beyond simple entertainment system compromise to potentially threaten aircraft safety systems and passenger data confidentiality. Attackers with physical access to the aircraft can exploit this vulnerability to gain unauthorized access to entertainment applications that may have connections to other aircraft systems or networks. The proximity requirement for exploitation suggests this vulnerability is particularly concerning for airport environments where attackers could potentially gain access to aircraft during maintenance operations or while passengers are present. The unspecified other impacts mentioned in the vulnerability description indicate that the attack surface may extend beyond the immediate entertainment applications to include broader system functionalities that could affect flight operations or data integrity. This vulnerability directly relates to ATT&CK technique T1059.007, which covers the use of scripting languages for execution, and T1071.004, which addresses application layer protocol usage, demonstrating how physical proximity attacks can leverage standard computing interfaces.
Mitigation strategies for this vulnerability must address both the immediate technical flaw and the broader security architecture of aviation entertainment systems. The primary solution involves implementing proper USB device isolation and authentication mechanisms that prevent unauthorized keyboard and mouse devices from interacting with critical system functions. This requires firmware-level modifications to ensure that USB ports can only communicate with approved device types and that input from peripheral devices is properly validated and sanitized before being processed by entertainment applications. Organizations should implement network segmentation between entertainment systems and critical aircraft systems to prevent lateral movement of attacks. Additionally, regular security assessments should be conducted to identify similar vulnerabilities in other aircraft systems, particularly those with similar USB connectivity features. The implementation of device whitelisting and mandatory authentication protocols for all USB connections would significantly reduce the risk of exploitation. This vulnerability underscores the importance of applying security-by-design principles to aviation systems and demonstrates how seemingly benign features like USB charging can become significant attack vectors when proper security controls are not implemented.