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Telegram desktop app leaked internet addresses when starting calls

You didn't have a choice to turn it off.
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Reuters/Dado Ruvic

Telegram has a reputation for privacy and security (much to the chagrin of some governments), but it's not immune to gaffes. Security researcher Dhiraj Mishra discovered that Telegram's desktop app was leaking both public and private IP addresses during voice calls due to its peer-to-peer framework. Where mobile users could turn off peer-to-peer calls and keep their information secret, you had no choice but use the technology on the desktop. That could open you to attacks or disclose your location regardless of how careful you might otherwise be.

The company has fixed the issue in both the 1.3.17 beta and 1.4 versions of Telegram by giving you options to either disable peer-to-peer calling entirely or limit it to your contacts. Mishra received a €2,000 (about $2,300) bounty for the find. It's not Telegram's proudest moment, but the flaw does serve as a reminder that you can't assume an app is airtight simply because of its reputation, even if most of its policies are sound.

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