Vulnerability in Viber allowed eavesdropping on other people's conversations

Habrahabr user under the pseudonym of “tambovchanin” reported vulnerability in Viber that allows hearing other people's conversations.
 
Researcher found the problem in October last year and informed the messenger service support about it.
 
It seems that the developers ignored the first message, so tambovchanin decided to make public the details of the problem.
 
The vulnerability allows overhearing other people's conversations, if at the time of communication on Viber one of the interlocutors answers an incoming call on a mobile network, leaving the other on hold.
 
While on hold, the user must double-click on the button “Hold”, and then he will hear the conversation of his interlocutor on the mobile network.
 
the vulnerability has been fixed In January 11 update, but it can remain relevant for those users who have not yet received a patch, according Securitylab.ru.

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