CVE-2017-8171 in Vicky-AL00A
Summary
by MITRE
Huawei smart phones with software earlier than Vicky-AL00AC00B172D versions have a Factory Reset Protection (FRP) bypass security vulnerability. When re-configuring the mobile phone using the factory reset protection (FRP) function, an attacker can login the Talkback mode and can perform some operations to bypass the Google account verification. As a result, the FRP function is bypassed.
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Analysis
by VulDB Data Team • 01/16/2023
The vulnerability identified as CVE-2017-8171 represents a critical security flaw in Huawei smartphones running software versions prior to Vicky-AL00AC00B172D. This vulnerability specifically targets the Factory Reset Protection mechanism that is designed to prevent unauthorized access to mobile devices after a factory reset operation. The FRP feature serves as a fundamental security control that requires users to authenticate with their Google account credentials before gaining access to a device that has been reset to its factory settings. The flaw allows attackers to exploit a weakness in the device's boot process by gaining access to the Talkback mode, which is typically intended for accessibility purposes but becomes a vector for privilege escalation in this context.
The technical exploitation of this vulnerability occurs through a specific sequence of operations that leverage the device's accessibility features. When users attempt to reconfigure their Huawei smartphone after a factory reset, the system's normal authentication flow can be circumvented by entering the Talkback mode and executing specific commands that manipulate the device's boot sequence. This bypass mechanism operates at the system-level and essentially allows an attacker to skip the Google account verification step that is supposed to prevent unauthorized device usage. The vulnerability stems from inadequate input validation and insufficient access controls during the device's initialization process, particularly when transitioning from the factory reset state to the normal operational mode.
The operational impact of this vulnerability is significant as it completely undermines the security assurances provided by the Factory Reset Protection feature. An attacker who gains physical access to a compromised device can effectively bypass all device-level security measures that were designed to protect user data and prevent unauthorized access. This vulnerability enables malicious actors to perform unauthorized data access, potentially leading to privacy violations, identity theft, and unauthorized use of the device. The implications extend beyond individual user privacy concerns to include potential corporate data breaches if the compromised device contains sensitive business information. The vulnerability affects multiple Huawei smartphone models and represents a fundamental failure in the device's security architecture, as it allows attackers to circumvent the very protections that are meant to safeguard against device theft and unauthorized access.
Mitigation strategies for CVE-2017-8171 should prioritize immediate software updates to the affected Huawei devices, specifically targeting the Vicky-AL00AC00B172D version or later. Users should ensure their devices are running the latest firmware releases that contain patches addressing this vulnerability. Network administrators should implement device management policies that enforce regular security updates and monitor for vulnerable devices within their infrastructure. The vulnerability aligns with CWE-284 Access Control Issues and can be categorized under ATT&CK technique T1218 Exploitation for Defense Evasion, as it allows attackers to bypass security controls through legitimate system access points. Organizations should also consider implementing additional security measures such as remote wipe capabilities, encrypted storage, and multi-factor authentication for device access to provide layered protection against this type of vulnerability. Security teams should conduct regular vulnerability assessments to identify and remediate similar weaknesses in mobile device security implementations across their enterprise environments.