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Researchers who warned half a dozen robot manufacturers in January about nearly 50 vulnerabilities in their home, business and industrial robots, say only a few of the problems have been addressed.
The researchers, Cesar Cerrudo and Lucas Apa of cybersecurity firm IOActive, said the vulnerabilities would allow hackers to spy on users, disable safety features and make robots lurch and move violently, putting users and bystanders in danger.
While they say there are no signs that hackers have exploited the vulnerabilities, they say the fact that the robots were hacked so easily and the manufacturers' lack of response raise questions about allowing robots in homes, offices and factories.
"Our research shows proof that even non-military robots could be weaponised to cause harm," Mr Apa said.
"These robots don't use bullets or explosives, but microphones, cameras, arms and legs. The difference is that they will be soon around us and we need to secure them now before it's too late."
Some of the robot manufacturers defended themselves, saying they had fixed some or all of the issues raised.
Mr Apa's comments come in the wake of a letter signed by more than 100 leading robotic experts urging the United Nations to ban the development of killer military robots, or autonomous weapons.
Mr Apa, a senior security consultant, said that of the six manufacturers contacted, only one, Rethink Robotics, said some of the problems had been fixed. He said he had not been able to confirm that as his team does not have access to that particular robot.
A spokesman for Rethink Robotics, which makes the Baxter and Sawyer assembly-line robots, said all but two issues - in the education and research versions of its robots - had been fixed.
Mr Apa said a review of updates from the other five manufacturers - Universal Robots of Denmark, SoftBank Robotics and Asratec Corp of Japan, Ubtech of China, and Robotis of South Korea - led him to believe none of the issues he had raised had been fixed.
Asratec said that software released for its robots so far was limited to "hobby use sample programs", and it believed IOActive was pointing to security vulnerabilities in those. Software it planned to release for commercial use would be different, it said.
SoftBank Robotics said it had already identified the vulnerabilities and fixed them. Ubtech said it had "fully addressed any concerns raised by IOActive that do not limit our developers from programming" their robots.
Universal Robots did not respond to emailed requests for comment. Robotis declined to comment.
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The slow reaction by the robot industry was not surprising, said Joshua Ziering, the founder of Kittyhawk.io, a commercial drone software company. "A new technology bursts on to the market and people fail to secure it," he said.
Cybersecurity experts said the robot vulnerabilities were alarming, and cyber criminals could use them to disrupt factories by ransomware attacks, or with robots slowed down or forced to embed flaws in the products they are programmed to build.
"The potential impact to companies, and even countries, could be massive," said Nathan Wenzler, the chief security strategist at AsTech, a San Francisco-based security consulting company, "should an attacker exploit the vulnerability within the applications that control these robots".
Even in the home, danger lurks, said Mr Apa, demonstrating how a 43 cm tall Alpha 2 robot from Ubtech could be programmed to violently jab a screwdriver.
"Maybe it's small and it's not really going to hurt right now, but the trend is that the robots are going to be more powerful," he said. "We tested industrial ones which are really heavy and powerful, and some of the attacks work with them."
last week, Mr Apa and Mr Cerrudo released details about the specific vulnerabilities they found, including one case where they mix several of those vulnerabilities together to hijack a Universal Robot factory robot, making it lurch about and become a potential threat.