June 19, 2018

Flaw in WhatsApp and Signal exposes group chats to 'extremely difficult' hacks

14 January 2018, 12:17 | Sam Montgomery

WhatsApp Security Flaw Lets Hackers Enter Any Group Unnoticed

Creepy hackers could secretly eavesdrop on your private WhatsApp group chats, experts claim

A huge WhatsApp design flaw that allows anyone to infiltrate private group chats has been uncovered by security researchers.

Group chat app Signal was found to have the same problem as WhatsApp, but as well as controlling the server the attacker also needs to know the chat's Group ID - which is nearly impossible to know without having physical access to one of the phones in the message thread.

San Francisco: WhatsApp is reportedly testing a new button in group chats that will allow one administrator to "demote" other administrators, without first deleting them from the group and then adding again as normal participants.

"The confidentiality of the group is broken as soon as the uninvited member can obtain all the new messages and read them", Paul Rösler, on of the co-authors of the paper, told Wired. German Cryptographers, in their research, have found out that WhatsApp group chats are hackable citing that any new member can read the group chats.

The problem sits in WhatsApp's authentication mechanism for adding people to group chats. WhatsApp is a widely used messenger and is available in more than 60 different languages which include 10 Indian languages.

Despite the service's end-to-end encryption, experts say hackers can insert people into WhatsApp groups without the permission of the chat's admin. However, users still get a notification of a new member joining.

The researchers dug up less serious flaws in the more specialized secure messaging apps Signal and Threema, too.

WhatsApp is yet to respond to this report. And, if you scroll through the unread messages in the WhatsApp group manually, then the button will vanish automatically.

Alex Stamos, chief security officer for WhatsApp owner Facebook Inc., downplayed the vulnerability today in a series of tweets on Twitter, where he emphasized the app's new chat member notifications as a key security feature. Thus, servers can not detect if the admin added new members or someone unknown joined the private conversation.

However, researchers from Germany discovered that WhatsApp's end-to-end encryption might be useless because it does not protect from unauthorized access via company's servers. The researchers recommend in their paper that summarizes their findings that users who rely on absolute privacy should stick to Signal or individual private messaging. "It's why we collect very little information and all messages sent on WhatsApp are end-to-end encrypted", the spokesperson added. Typical group chats are managed by one person who is identified as the administrator of the chat.

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