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Android App with 100M Downloads Found Sending Data to Remote Servers

March 7, 2023 By Heinrich Long — 5 Comments
Android App with 100M Downloads Found Sending Data to Remote Servers

SHEIN, a clothes shopping app for Android that has over 100 million downloads on Google Play, was sending sensitive clipboard content to a remote server.

SHEIN is a Singapore-based Chinese online fashion retailer shipping products across 150 countries. It is valued at $100 billion, and in 2022, it became the world’s largest fashion retailer.

SHEIN app on Google Play

The risky app behavior was discovered by Microsoft threat researchers and reported to Google, while SHEIN’s developers removed the clipboard data retrieval function from the application with an update released in May 2022.

Microsoft says that it has discovered no indications of malicious intent. However, the app’s behavior was still introducing unnecessary risk to users and wasn’t needed to deliver the core functionality of the shopping app.

“Even if SHEIN’s clipboard behavior involved no malicious intent, this example case highlights the risks that installed applications can pose, including those that are highly popular and obtained from the platform’s official app store.”

– Microsoft

App Coding Mistake

Microsoft researchers Dimitrios Valsamaras and Michael Peck analyzed SHEIN app version 7.9.2 using static and dynamic analysis tools and techniques, focusing on code accessing clipboard contents.

The clipboard is a temporary storage area on operating systems that holds the contents of copied data such as text, images, passwords, etc. As such, it can contain sensitive information.

The analysts found that SHEIN contains code that reads the contents of the device clipboard upon the app’s launch and when the user interacts with the app.

If specific characters are found in the clipboard, like “$” and “://”, the app sends the clipboard contents to a remote server at “https://api-service[.]shein[.]com/marketing/tinyurl/phrase.”

The researchers confirmed this risky behavior on an Android 9 test device they used for capturing the associated requests using the Burp Proxy tool.

Valsamaras told RestorePrivacy that the app’s developer hasn’t specified the reason for using the particular characters as triggers for clipboard data siphoning. However, he noted that the case doesn’t appear malicious but rather a bug due to inheriting a class that had the specific code.

Still, this case goes to show that if an app wants to access the clipboard and exfiltrate its contents to an external server, there are little obstacles in place to prevent it.

Also, even if SHEIN’s case does not appear to be the result of malicious intentions, any unecessary data exchange increases the likelihood of man-in-the-middle breaches, or a rogue employee of the company taking advantage of that data stored in private servers.

Android Protections

Starting in Android 10, Google introduced clipboard access restrictions for applications running in the background.

However, since the SHEIN app demonstrated the risky behavior while running in the foreground, these protections wouldn’t have prevented the data access.

On Android 12, Google added a notification to inform users when an app accessed the clipboard for the first time.

Android 13, currently the latest version of Google’s mobile OS, periodically wipes all clipboard contents to prevent unauthorized access to sensitive data.

Users are advised to avoid using copy-paste for highly sensitive information if possible, which writes this data on the clipboard, and consider removing apps that access that space despite it not being crucial for their functionality.

Related Articles:

  • Controlling Communication Channels is Crucial for Privacy
  • DuckDuckGo Browser Allows Microsoft to Track Users Thanks to Confidential Agreement
  • Best VPN for Android in 2023
  • Alternatives to Google Products — The Big List

About Heinrich Long

Heinrich is an associate editor for RestorePrivacy and veteran expert in the digital privacy field. He was born in a small town in the Midwest (USA) before setting sail for offshore destinations. Although he long chafed at the global loss of online privacy, after Edward Snowden’s revelations in 2013, Heinrich realized it was time to join the good fight for digital privacy rights. Heinrich enjoys traveling the world, while also keeping his location and digital tracks covered.

Reader Interactions

Comments

  1. jack

    March 20, 2023

    Thanks for sharing these articles and your work. Its nice to see places like this still keeping active and helping people

    Reply
  2. XeBoB

    March 11, 2023

    That’s what many sites especially financial institutions have you do now: manually type your 30+ password. They disable paste functionality. Even McDonald’s where I’m at does.

    Reply
  3. John

    March 10, 2023

    You can use a free app called NetGuard , to firewall any apps that dont run on root level .

    Reply
  4. BoBeX

    March 10, 2023

    Great article Heinrich!
    Makes me wonder about persons cutting and pasting passwords…

    Reply
    • John

      March 10, 2023

      It is common for people that use password managers . I use KeyPass on Android and Linux . So yeah , even experienced computer users copy passwords into the clipboard . Not a big fan of typing random generated 30+ character long passwords .

      Reply

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