# Common Android 0day

**Zero-day vulnerabilities** are previously unknown security flaws in software or hardware that are exploited by attackers before a fix is available. Android zero-day vulnerabilities are particularly concerning because they can be used to compromise a large number of devices before a patch is issued. Here’s an overview of common Android zero-day vulnerabilities, including their typical characteristics, impacts, and examples.

#### Characteristics of Android Zero-Day Vulnerabilities

1. **Unknown to the Vendor**
   * The vulnerability is not known to the Android development team or security researchers, so no patches or fixes are available.
2. **Exploited in the Wild**
   * The vulnerability is actively being used by attackers to exploit devices, often in sophisticated attacks or targeted campaigns.
3. **Critical Impact**
   * Zero-day vulnerabilities often have significant security implications, such as allowing remote code execution, privilege escalation, or unauthorized access to sensitive data.
4. **Difficulty in Detection**
   * These vulnerabilities can be challenging to detect because they are not documented or widely known, making it hard for traditional security tools to identify them.

#### Examples of Android Zero-Day Vulnerabilities

1. **Android 0-Day in 2019**
   * **Description**: A zero-day vulnerability in the Android framework allowed attackers to gain elevated privileges and execute arbitrary code. It was exploited through maliciously crafted applications.
   * **Impact**: Potential for privilege escalation and arbitrary code execution, affecting the security of the device and user data.
2. **CVE-2020-0040**
   * **Description**: A vulnerability in the Android Media Framework that allowed attackers to exploit a flaw in media processing components to execute arbitrary code.
   * **Impact**: Remote code execution when a user opens a specially crafted media file, potentially leading to full device compromise.
3. **CVE-2020-0318**
   * **Description**: A vulnerability in Android’s media library that permitted a remote attacker to exploit the flaw through specially crafted media files.
   * **Impact**: Remote code execution with media files, affecting device integrity and user data.
4. **CVE-2020-0069**
   * **Description**: A vulnerability in Android’s Bluetooth subsystem allowed attackers to execute arbitrary code by sending specially crafted Bluetooth packets.
   * **Impact**: Potential for remote code execution and unauthorized access through Bluetooth communication.
5. **CVE-2021-0930**
   * **Description**: A zero-day vulnerability in the Android kernel that allowed privilege escalation due to improper handling of certain system calls.
   * **Impact**: Elevation of privileges, potentially leading to complete control over the device and its data.

#### Impact of Android Zero-Day Vulnerabilities

* **Remote Code Execution**: Attackers can execute arbitrary code on the device, leading to unauthorized access and control.
* **Privilege Escalation**: Gaining elevated permissions to bypass security restrictions and access sensitive data.
* **Data Theft**: Exposure of personal or confidential information, including contacts, messages, and financial details.
* **Device Compromise**: Full control over the device, potentially using it for malicious purposes or participating in broader attacks.