WhatsApp has rushed to roll out a security fix after concerns were raised hackers could inject surveillance software on to phones via the call function. The company says users should upgrade to the latest version of the app.
The vulnerability allowed attackers to install malicious code on iPhones and Android phones by ringing up a target device. The code could be transmitted even if users did not answer their phones and a log of the call often disappeared, the Financial Times reported.
The Facebook-owned company says the attack bore a resemblance to spyware developed for intelligence agencies. There are concerns that the software was used in attempts to access the phones of human rights campaigners, including a UK-based lawyer.