Think you're safe from spies because you're using Tails, the same Linux distribution that Edward Snowden uses to remain anonymous? Unfortunately, you'll still have to be on your guard. Security firm Exodus Intelligence has revealed that the latest version of the OS, 1.1, is vulnerable to attacks that could be used to unmask your identity. The researchers say they won't publish details of the exploit until there's a patch, but the Tails team will have to wait up to a week before it gets a report it can use to whip up an emergency fix. In the meantime, the discovery is an all too blunt reminder that no software offers a complete guarantee of privacy -- even if it's built with anonymity in mind.