CVE-2017-2696 in Y6 II
Summary
by MITRE
The emerg_data driver in CAM-L21C10B130 and earlier versions, CAM-L21C185B141 and earlier versions has a buffer overflow vulnerability. An attacker with the root privilege of the Android system can tricks a user into installing a malicious application on the smart phone, and send given parameter to smart phone to crash the system or escalate privilege.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 01/11/2023
The CVE-2017-2696 vulnerability resides within the emerg_data driver component of specific CAM-L21C10B130 and earlier firmware versions, as well as CAM-L21C185B141 and earlier releases. This driver operates within the Android operating system's kernel space, handling emergency data communication protocols that are critical for device functionality. The vulnerability manifests as a classic buffer overflow condition that occurs when the driver processes malformed input parameters, particularly those related to emergency data transmission. The flaw represents a significant security weakness in the device's kernel-level communication stack, where insufficient input validation allows attackers to manipulate memory structures through carefully crafted parameters.
The technical exploitation of this vulnerability leverages the fact that the emerg_data driver operates with elevated privileges within the Android system architecture. When an attacker with root access on the device installs a malicious application, they can craft specific parameter inputs that trigger the buffer overflow condition. The vulnerability occurs because the driver does not properly validate the length of incoming data before copying it into fixed-size memory buffers, creating a situation where excessive data can overwrite adjacent memory locations. This memory corruption can lead to arbitrary code execution within the kernel space, potentially allowing privilege escalation from the malicious application's context to full system root access. The attack vector requires a pre-existing root compromise of the Android device, making it a post-exploitation vulnerability that amplifies existing access into full system control.
The operational impact of CVE-2017-2696 extends beyond simple system crashes, as it provides a pathway for persistent system compromise and privilege escalation. Once exploited, the vulnerability enables attackers to gain complete control over the device's kernel, potentially allowing them to bypass Android security mechanisms, access encrypted data, modify system files, and establish backdoor access. The vulnerability affects devices running older firmware versions where the emerg_data driver has not been patched, making it particularly concerning for organizations with legacy Android devices or those unable to update their systems. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and kernel-level exploitation methods, representing a sophisticated attack pathway that bypasses traditional Android security boundaries. The vulnerability also aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows, though the specific implementation appears to be a stack overflow scenario.
Mitigation strategies for CVE-2017-2696 focus primarily on firmware updates and system hardening measures. Device manufacturers should immediately release security patches that address the buffer overflow in the emerg_data driver, ensuring that input validation is properly implemented to prevent parameter overflows. System administrators should enforce strict firmware update policies and conduct regular vulnerability assessments to identify devices running affected firmware versions. Additional mitigations include implementing kernel address space layout randomization, enabling stack canaries, and deploying runtime protection mechanisms that can detect and prevent buffer overflow exploitation attempts. Organizations should also consider network-level monitoring to detect anomalous emergency data transmission patterns that might indicate exploitation attempts. The vulnerability highlights the importance of secure coding practices in kernel drivers and demonstrates how seemingly minor input validation flaws can create significant security risks in mobile operating systems. Security teams should implement comprehensive monitoring for kernel-level anomalies and maintain up-to-date threat intelligence regarding similar vulnerabilities in embedded systems and mobile device drivers.