Undisclosed WhatsApp Vulnerability Lets Governments See Who You Message

WhatsApp's security team warned that despite the app's encryption, users are vulnerable to government surveillance through traffic analysis, according to an internal threat assessment obtained by The Intercept. The document suggests that governments can monitor when and where encrypted communications occur, potentially allowing powerful inferences about who is conversing with whom. The report adds: Even though the contents of WhatsApp communications are unreadable, the assessment shows how governments can use their access to internet infrastructure to monitor when and where encrypted communications are occurring, like observing a mail carrier ferrying a sealed envelope. This view into national internet traffic is enough to make powerful inferences about which individuals are conversing with each other, even if the subjects of their conversations remain a mystery. "Even assuming WhatsApp's encryption is unbreakable," the assessment reads, "ongoing 'collect and correlate' attacks would still break our intended privacy model." The WhatsApp threat assessment does not describe specific instances in which it knows this method has been deployed by state actors. But it cites extensive reporting by the New York Times and Amnesty International showing how countries around the world spy on dissident encrypted chat app usage, including WhatsApp, using the very same techniques. As war has grown increasingly computerized, metadata -- information about the who, when, and where of conversations -- has come to hold immense value to intelligence, military, and police agencies around the world. "We kill people based on metadata," former National Security Agency chief Michael Hayden once infamously quipped. Meta said "WhatsApp has no backdoors and we have no evidence of vulnerabilities in how WhatsApp works." Though the assessment describes the "vulnerabilities" as "ongoing," and specifically mentions WhatsApp 17 times, a Meta spokesperson said the document is "not a reflection of a vulnerability in WhatsApp," only "theoretical," and not unique to WhatsApp.

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