CVE-2018-3910 in Home Camera 27US
Summary
by MITRE
An exploitable code execution vulnerability exists in the cloud OTA setup functionality of Yi Home Camera 27US 1.8.7.0D. A specially crafted SSID can cause a command injection, resulting in code execution. An attacker can cause a camera to connect to this SSID to trigger this vulnerability. Alternatively, an attacker can convince a user to connect their camera to this SSID.
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Analysis
by VulDB Data Team • 06/04/2023
The vulnerability identified as CVE-2018-3910 represents a critical code execution flaw within the cloud over-the-air setup functionality of Yi Home Camera 27US firmware version 1.8.7.0D. This issue stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data during network configuration processes. The vulnerability specifically affects the camera's wireless network setup procedure where the device accepts SSID parameters without sufficient security checks, creating a pathway for malicious actors to inject arbitrary commands into the system. The flaw manifests when a specially crafted SSID string is used to establish a network connection, allowing attackers to execute arbitrary code with the privileges of the camera's system process.
The technical implementation of this vulnerability falls under CWE-77 and CWE-94 categories, representing command injection and code injection weaknesses respectively. The attack vector operates through the camera's wireless configuration interface where the device processes network parameters without proper sanitization of special characters or command sequences that could be interpreted as executable code. When a user connects the camera to a malicious SSID, the system processes the input without adequate validation, leading to command injection that can result in full system compromise. The vulnerability is particularly concerning because it requires minimal user interaction to exploit, as the camera automatically attempts to connect to networks specified in its configuration, making it susceptible to both active and passive attack scenarios.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data exfiltration. An attacker who successfully exploits this vulnerability gains the ability to execute arbitrary commands on the camera's embedded system, potentially allowing for remote code execution, privilege escalation, and persistent access to the device. The camera's network connectivity and video streaming capabilities become compromised, potentially enabling attackers to capture and transmit video feeds to external servers, access stored media, or use the device as a pivot point for further attacks within the local network. This vulnerability also poses risks to user privacy and network security, as the compromised device could serve as an entry point for broader network infiltration.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and sanitization mechanisms within the camera's wireless configuration subsystem. Network administrators should ensure that all Yi Home Camera devices are updated to the latest firmware versions that address this specific vulnerability, as the manufacturer likely released patches to prevent command injection attacks. The implementation of secure coding practices including parameterized queries, input filtering, and proper command execution mechanisms should be enforced during development cycles. Additionally, network segmentation and monitoring solutions should be deployed to detect unusual network activity patterns that might indicate exploitation attempts. Organizations should also consider implementing network access controls that prevent unauthorized devices from connecting to their networks, thereby reducing the attack surface for such vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under T1059.001 for command and script injection, highlighting the need for comprehensive security controls that address both the technical flaw and potential attack methodologies.