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September 25, 2021

WhatsApp, Telegram patch flaws in instant messaging applications

Image: A 3D printed Whatsapp logo is seen in front of a displayed stock graph in this illustration taken April 28, 2016. REUTERS/Dado Ruvic/Illustration/files

By Joseph Menn

SAN FRANCISCO (Reuters) – WhatsApp and Telegram patched flaws in their popular instant messaging applications after security researchers showed that they could seize control of user accounts.

A man holds a smartphone showing the Islamic State logo in front of a screen showing the Telegram logo in this picture illustration shot November 18, 2015. REUTERS/Dado Ruvic/Illustration/File Photo

Researchers with Check Point Software Technologies Inc discovered problems with the way the two apps process some types of files without verifying that they do not contain active code that could be malicious.

Flaws in popular instant messaging applications are less common than traditional desktop software. The apps are often used because of their heavy encryption, which has been criticized by some in laws enforcement.

They were able to send files to the web-based versions of the products with malicious code while making it seem to be something else, such as a picture. In WhatsApp’s case, once opened by the recipient, the code allowed the researchers to get into the local storage of the user and then access the user’s account. From there, they could have sent the same malicious attack to all of the users’ contacts.

Telegram’s flaw was much more subtle and required “very unusual” behavior by the victim, such as right-clicking on a video and opening a new tab, said spokesman Markus Ra.

There is no evidence that any similar attacks were actually used in the wild against either company’s products, he said.

“When Check Point reported the issue, we addressed it within a day and released an update of WhatsApp for web,” said Anne Yeh, a spokeswoman for that Facebook Inc unit. “To ensure that you are using the latest version, please restart your browser.”

(Reporting by Joseph Menn; Editing by Lisa Shumaker)

Copyright 2017 Thomson Reuters. Click for Restrictions.

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