WhatsApp's 'View Once' could be 'View Whenever' due to a flaw

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WhatsApp's 'View Once' could be 'View Whenever' due to a flaw
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It promised vanishing messages, but now 'it's privacy theater'

A popular privacy feature in WhatsApp is"completely broken and can be trivially bypassed," according to developers at cryptowallet startup Zengo.

The server would still send these messages to other platforms, but they couldn't be viewed - unless someone fiddled with the code. "Which means it’s the virtual equivalent of putting a note on the picture that says 'don’t look.' All that is required for attackers to circumvent it, is merely to set this flag to false and the media become regular and can be downloaded, forwarded and shared."View Once mode, which allows messages to be sent, looked at, and then deleted without the recipient being able to save a screenshot of the message.

Additionally, the Zengo team found code examples on GitHub of a modified Android client and a Chrome extension that could allow anyone to exploit the issue. So the team decided to abandon the usual 90-day waiting period for responsible disclosure and go public.

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