That’s why it’s important to take several security measures regarding TeamViewer:
But because it runs in the background, the target machine can be taken over at the absence of a human observer. when there are people on both ends, at least at the start of the connection. Another more recent example allows phishing attacks to take control of the target machine One such brute-force example has been reported in 2018. brute force protection), but it is not immune to 0day vulnerabilities. This allows TeamViewer to enforce security policies (e.g.
0days – TeamViewer is effectively a cloud service – both parties connect to a TeamViewer server. To make things worse, many people go with simple defaults and that leads to credential sharing, which makes it hard to spot the malicious actor. Malicious insiders – TeamViewer allows malicious insiders to just do whatever they want. Leaked credentials mean full takeover by a malicious party Therefore credentials are easy to dictate over the phone or to be pasted in an email. Leaked credentials – TeamViewer’s goal is to be easy to use. What Are The Security Risks From Using TeamViewer? But it lets you easily shoot yourself in the foot by silently exposing one or more computers (and therefore possibly a large part of your infrastructure) to the internet. It has its place for helpdesk tasks, especially in a work-from-home scenario, even in larger organizations. It’s easy to say “Don’t use TeamViewer”, but with lack of budget, lack of security experts on the market and lack of executive understanding of the risk and importance, using TeamViewer is just a symptom. The details of the story are important, as the actual impact has been mitigated by good monitoring procedures by the employees on shift as well as by a physical limitation in the amount of the dangerous chemical that could have been released, but we’d like to focus on the broader picture. 
But using it in large organizations, and especially for critical infrastructure, is rather risky, as shown in a recent attempt to poison the water of a city in Florida. TeamViewer is a great utility for remotely helping your relatives or for IT people servicing small businesses.
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