Monday, March 14, 2022

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1. Remote Code Execution via GIF

In October 2019, security researcher Awakened revealed a vulnerability in WhatsApp that let hackers take control of the app using a GIF image. The hack works by taking advantage of the way WhatsApp processes images when the user opens the Gallery view to send a media file.

When this happens, the app parses the GIF to show a preview of the file. GIF files are special because they have multiple encoded frames. This means that code can be hidden within the image.

If a hacker were to send a malicious GIF to a user, they could compromise the user's entire chat history. The hackers would be able to see who the user had been messaging and what they had been saying. They could also see users' files, photos, and videos sent through WhatsApp.

The vulnerability affected versions of WhatsApp up to 2.19.230 on Android 8.1 and 9. Fortunately, Awakened disclosed the vulnerability responsibly and Facebook, which owns WhatsApp, patched the issue. To keep yourself safe from this problem, you should always keep WhatsApp updated.

Another WhatsApp vulnerability discovered in early 2019 was the Pegasus voice call hack.


This scary attack allowed hackers to access a device simply by placing a WhatsApp voice call to their target. Even if the target didn't answer the call, the attack could still be effective. And the target may not even be aware that malware has been installed on their device.


This worked through a method known as buffer overflow. This is where an attack deliberately puts in heaps of code into a small buffer so that it "overflows" and writes code into a location it shouldn't be able to access. When the hacker can run code in a location that should be secure, they can take malicious steps.