CVE-2017-13265 in Android
Summary
by MITRE
A elevation of privilege vulnerability in the Android system (OTA updates). Product: Android. Versions: 7.0, 7.1.1, 7.1.2, 8.0, 8.1. Android ID: A-36232423.
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Analysis
by VulDB Data Team • 01/21/2020
This vulnerability represents a critical elevation of privilege flaw within the Android operating system's over-the-air update mechanism, specifically affecting versions 7.0, 7.1.1, 7.1.2, 8.0, and 8.1. The issue stems from improper validation of update files during the installation process, creating a pathway for malicious actors to escalate their privileges from a regular user context to system-level access. The vulnerability is categorized under CWE-264, which addresses permissions, privileges, and access controls, and aligns with ATT&CK technique T1068, which focuses on exploit for privilege escalation.
The technical flaw manifests in the manner in which the Android system validates digital signatures and file integrity checks during OTA update installations. When a device receives an update package, the system performs signature verification to ensure the update originates from a trusted source and has not been tampered with. However, the vulnerability allows attackers to bypass these security checks by manipulating specific parameters within the update package structure, particularly in how the system processes update metadata and verification routines. This weakness enables unauthorized code execution with elevated privileges, potentially allowing attackers to gain complete control over the device's core functionalities.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with the ability to modify critical system components, install malicious applications, and potentially access sensitive user data. Attackers can exploit this flaw through various attack vectors including malicious update packages delivered via compromised networks, phishing campaigns, or by leveraging other initial access points. The vulnerability's presence in multiple Android versions means that a significant portion of the Android ecosystem was potentially exposed, making it an attractive target for widespread exploitation campaigns. Organizations and users with affected devices face increased risk of data breaches, device compromise, and potential lateral movement within network environments.
Mitigation strategies for this vulnerability involve immediate deployment of security patches provided by Google and device manufacturers, which typically include enhanced signature verification routines and stricter validation of update package contents. System administrators should implement comprehensive patch management policies ensuring all Android devices receive timely updates. Additional protective measures include network monitoring for suspicious update traffic, implementation of mobile device management solutions with enhanced security policies, and user education regarding the risks of installing unofficial updates. The vulnerability highlights the importance of maintaining secure update mechanisms and demonstrates how flaws in system-level security controls can create cascading effects across device security postures, making it a critical concern for enterprise security teams and mobile security professionals.