Teso says that ACARS still has virtually no authentication features to prevent spoofed commands.
In a statement, EASA said it was aware of Mr Teso's work and presentation.
Tesco ( TESO - news - people ) vanished before they were filled.
Old aviation equipment was bought via eBay to help Mr Teso interrogate the code these systems ran.
Mr Teso said there was little risk that malicious hackers would be able to use what he found.
Mr Teso built his simulator using spare parts from real jets for sale on the eBay auction site.
Teso isn't the first so-called "white hat" hacker to expose what appear to be holes in air-traffic security.
Mr Teso set out to find a way to subvert the flight management systems (FMS) found on many different aircraft.
Teso says he developed SIMON in a way that makes it work only in virtual environments, not on actual aircraft.
Analyst Graham Cluley of Sophos Security said it's unclear how devastating Teso's find would be if unleashed on an actual airplane.
Other competitors in the energy sector include: Baker Hughes (BHI), Tesco Corporation (USA) (TESO), and Cameron International (CAM).
Analyst Graham Cluley of Sophos Security said it's unclear how devastating Teso's find would be if unleashed on an airplane in flight.
Now, he said, Mr Teso and n.runs, the German security company he works for, are setting up meetings to pass on his findings.
The loopholes in the flight management system were detailed by Mr Teso during a presentation to the Hack In The Box conference in Amsterdam.
Security researcher Hugo Teso was able to "hijack" the systems to feed false navigation information to a simulated jet that made it change course.
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Teso said at the summit that he's reached out to the companies that make the systems he exploited and that they were receptive to addressing his concerns.
In his talk, Teso demonstrated an Android application he built that allowed him to redirect a virtual plane with just a tap on a map application running on his Samsung Galaxy phone.
The Federal Aviation Administration said it is aware of Teso's claims, but said the hacking technique does not pose a threat on real flights because it does not work on certified flight hardware.
Teso told the crowd that he used flight-management hardware that he bought on eBay and publicly available flight-simulator software that contains at least some of the same computer coding as real flight software.
Mr Teso, who is also a qualified commercial pilot, said he had spent the past four years investigating the many different computer and data systems found on aircraft which help them fly and navigate safely.
In his presentation, Teso explained that he experimented on used FMS hardware he bought from eBay and FMS training simulation software that was advertised as containing some or all of the same code as the systems in real planes.
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