CVE-2017-0638 in Android
Summary
by MITRE
A remote code execution vulnerability in System UI component could enable an attacker using a specially crafted file to execute arbitrary code within the context of an unprivileged process. This issue is rated as High because it is a remote arbitrary code execution in an unprivileged process. Product: Android. Versions: 7.1.1, 7.1.2. Android ID: A-36368305.
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Analysis
by VulDB Data Team • 12/28/2020
The vulnerability identified as CVE-2017-0638 represents a critical remote code execution flaw within the System UI component of Android operating systems. This vulnerability specifically affects Android versions 7.1.1 and 7.1.2, making it a significant concern for users and organizations relying on these system versions. The issue stems from inadequate input validation mechanisms within the System UI framework, which processes user interface elements and system notifications. When a malicious actor crafts a specially designed file and delivers it to a victim's device, the vulnerable System UI component fails to properly sanitize the input, creating a pathway for unauthorized code execution.
The technical nature of this vulnerability places it squarely within the realm of privilege escalation attacks, as it allows execution within the context of an unprivileged process while potentially enabling further exploitation. According to CWE classification, this vulnerability aligns with CWE-121, which deals with stack-based buffer overflow conditions, and CWE-787, which addresses out-of-bounds write conditions. The attack surface is particularly concerning because System UI components typically handle user interactions and system notifications, making them accessible through various attack vectors including malicious email attachments, compromised websites, or infected file downloads. The remote execution capability means that attackers do not require physical access to the device, significantly expanding the potential attack surface and making this vulnerability particularly dangerous in mobile environments.
The operational impact of CVE-2017-0638 extends beyond simple code execution, as it can potentially lead to complete system compromise and data exfiltration. The vulnerability's classification as High severity by the Android security team reflects its potential for widespread exploitation and the ease with which attackers can leverage it. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.007 (Command and Scripting Interpreter: PowerShell) and T1203 (Exploitation for Client Execution), as it enables adversaries to execute malicious code remotely. The unprivileged execution context means that initial compromise may not immediately result in system-level access, but it provides a foothold for further exploitation and privilege escalation attacks. Organizations should consider this vulnerability as part of a broader threat landscape where mobile devices serve as entry points for more extensive network infiltration attempts.
Mitigation strategies for CVE-2017-0638 primarily focus on immediate system updates and patches provided by Google. The Android security team released patches for affected versions, and users should prioritize upgrading to Android 8.0 or later where this vulnerability has been resolved. Network administrators should implement mobile device management policies that enforce automatic security updates and monitor for suspicious file downloads or system behavior. Additionally, security awareness training for end users remains crucial in preventing social engineering attacks that might deliver malicious files through email or other communication channels. Organizations should also consider implementing network segmentation and monitoring solutions to detect anomalous behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date mobile security protocols and highlights the need for continuous monitoring of security advisories from vendors such as Google and the National Vulnerability Database.