Hacking Satellites - spacecraft are in many ways computers in the sky, and like any other computer, they can be hacked. In addition, their need to communicate via radio (which is fairly easy to intercept) makes them vulnerable in ways other systems aren’t. This isn’t a hypothetical scenario either, it has happened already.
The successful attacks occurred in 2007 and 2008. The more serious of the two happened in ’08 when NASA had control of the Terra EOS earth observation system satellite disrupted for 2 minutes in June, and then a further 9 minutes in October. During that time, whoever took control had full access to the satellites’ systems, but chose to do nothing with it. The second hack affected the Landsat-7 satellite on two occasions, one in October of ’07, the other in July of ’08. Unlike the Terra OS incident, this hack did not see control taken away, but access was gained.
This brings up some interesting question, e.g. what can you do with a hijacked spacecraft, and how can a spacecraft be protected? Read the full article on h+ magazine for an interesting summary on the current state of the problem, and where things are headed next.