CVE-2019-13322 in Xiaomi
Summary
by MITRE
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Xiaomi Browser Prior to 10.4.0. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of the miui.share application. The issue results from the lack of proper validation of user-supplied data, which can result in an arbitrary application download. An attacker can leverage this vulnerability to execute code in the context of the user. Was ZDI-CAN-7483.
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Analysis
by VulDB Data Team • 05/10/2025
This vulnerability represents a critical remote code execution flaw in Xiaomi Browser versions prior to 10.4.0, classified under CWE-20 as improper input validation. The vulnerability specifically resides in the miui.share application component which fails to properly validate user-supplied data during application download processes. Attackers can exploit this weakness by crafting malicious web pages or files that trigger the vulnerable code path, leading to arbitrary code execution within the user's browser context. The vulnerability requires user interaction through visiting a malicious webpage or opening a malicious file, making it a typical client-side attack vector that relies on social engineering techniques. This aligns with ATT&CK technique T1203 which describes exploitation of software vulnerabilities through web-based attacks requiring user engagement.
The technical implementation of this flaw involves improper validation of application download requests within the miui.share component, which allows attackers to manipulate the application download process and potentially execute malicious code with the privileges of the user. The vulnerability stems from insufficient sanitization of user-supplied input parameters that are passed to the application download mechanism. This creates a path where an attacker can inject malicious payloads that bypass normal security controls and execute within the browser's execution environment. The lack of proper validation creates a direct code execution pathway that can be leveraged for various malicious activities including data theft, system compromise, or further attack propagation.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential full system compromise when combined with other attack vectors. An attacker who successfully exploits this vulnerability can gain complete control over the affected device, potentially accessing sensitive user data, installing additional malware, or using the compromised device as a launch point for attacks against other systems. The vulnerability affects all users of affected Xiaomi Browser versions, making it particularly dangerous as it requires no special privileges or advanced technical knowledge to exploit. The issue represents a significant security gap in mobile browser security and highlights the importance of proper input validation in mobile application frameworks. Organizations should consider this vulnerability as part of their mobile security posture assessment and ensure all mobile browser components are updated to mitigate potential exploitation.
Mitigation strategies should focus on immediate patch deployment to Xiaomi Browser versions 10.4.0 and later, which contain the necessary fixes for the validation issues. System administrators should implement network-based controls such as web application firewalls and content filtering to block malicious content that could exploit this vulnerability. User education programs should emphasize the importance of avoiding suspicious websites and email attachments, as the attack requires user interaction to succeed. Additionally, mobile device management solutions should enforce automatic updates for browser components and maintain inventory of all installed applications to quickly identify and remediate affected systems. Security monitoring should include detection of suspicious download activities and unusual application behavior that could indicate exploitation attempts.