German researchers have announced the discovery of news security flaws in SS7 protocol that could be exploited by an attacker to spy on private phone calls and intercept text messages. The flaws will be reported at the next hacker conference in Hamburg this month. The American Civil Liberties Union has also warned people against possible abuse of such vulnerabilities by Intelligence agencies and Law enforcement. Experts say its increasingly clear that SS7, first designed in the 1980s, is riddled with serious vulnerabilities that undermine the privacy of the world’s billions of cellular customers.”]
Source: http://securityaffairs.co/wordpress/31262/hacking/flaws-ss7-protocol-spy-on-phone.html