CVE-2019-15421 in BV7000 Pro
Summary
by MITRE
The Blackview BV7000_Pro Android device with a build fingerprint of Blackview/BV7000_Pro/BV7000_Pro:7.0/NRD90M/1493011204:user/release-keys contains a pre-installed app with a package name of com.mediatek.factorymode app (versionCode=1, versionName=1) that allows unauthorized wireless settings modification via a confused deputy attack. This capability can be accessed by any app co-located on the device.
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Analysis
by VulDB Data Team • 02/20/2024
The vulnerability identified as CVE-2019-15421 represents a critical security flaw in the Blackview BV7000_Pro Android device that stems from improper privilege management within a pre-installed factory mode application. This device operates on Android 7.0 with build fingerprint Blackview/BV7000_Pro/BV7000_Pro:7.0/NRD90M/1493011204:user/release-keys and contains a factory mode application with package name com.mediatek.factorymode that has version code 1 and version name 1. The flaw exists within the application's permission model and communication mechanisms that enable unauthorized modification of wireless settings through a confused deputy attack vector.
The technical implementation of this vulnerability involves a confused deputy attack where a malicious application can exploit the legitimate communication pathways established by the factory mode application to perform unauthorized actions. The factory mode application, which should typically operate with elevated privileges and restricted access, fails to properly validate the authenticity of requests originating from other applications. This allows any application co-located on the device to leverage the factory mode application's permissions to modify wireless settings such as Wi-Fi configurations, Bluetooth parameters, and cellular network settings without proper authorization. The vulnerability is classified under CWE-284 which describes improper access control, specifically where applications fail to properly restrict access to privileged operations.
The operational impact of this vulnerability is significant as it fundamentally undermines the device's security model by allowing arbitrary applications to modify core wireless communication parameters. An attacker could potentially disable wireless connectivity, redirect network traffic, or establish persistent backdoors through unauthorized modifications to wireless settings. The attack surface is particularly concerning because the vulnerable application runs with system-level privileges and can be accessed by any application installed on the device, making exploitation trivial and widespread across the device's application ecosystem. This vulnerability enables attackers to manipulate network configurations in ways that could facilitate data exfiltration, man-in-the-middle attacks, or complete network compromise of the affected device.
Mitigation strategies should focus on immediate remediation through system updates that properly implement access controls and privilege separation within the factory mode application. Device manufacturers should implement proper signature verification mechanisms to ensure that only trusted applications can communicate with privileged system components. The solution must address the confused deputy problem by implementing strict validation of calling applications and their permissions before allowing any wireless setting modifications. Security measures should include enforcing proper access control lists, implementing mandatory access controls, and ensuring that factory mode applications operate in restricted environments that prevent unauthorized cross-application communication. Additionally, users should be advised to avoid installing untrusted applications and to maintain current system updates to protect against this vulnerability. The ATT&CK framework categorizes this issue under privilege escalation techniques where attackers exploit legitimate system tools to gain elevated privileges, making it a critical concern for mobile device security and network integrity.