When installing certain packages like typescript through NPM, there are instances where you need to run the command:
Set-ExecutionPolicy -ExecutionPolicy RemoteSignedIn PowerShell, if you try to change this policy, a warning message indicates that:
Changing the execution policy could potentially expose you to security risks
I'm curious to know more about these security risks. Could allowing such actions pose any threats, especially when dealing with popular packages like typescript?
Using RemoteSigned poses minimal risk as it allows for the execution of unsigned scripts (those you write) only on your local computer. Scripts from a remote source, such as the internet, must be signed by a trusted authority to run. The main security concern is the possibility of running a malicious script unknowingly on your local machine. This method is highly endorsed and comes as the default option on Server editions.
On the other hand, Unrestricted is considered highly insecure as it permits the execution of unsigned scripts from any source, making it not a recommended choice.
Restricted, although secure, can be quite cumbersome as even signed scripts may have trouble executing, allowing only interactive sessions. This setting is set as the default on desktop editions.
PowerShell execution policies are primarily implemented to prevent accidental script executions rather than for security reasons.
Although the Bypass ExecutionPolicy can ignore execution policies, blocking it requires group policies.
However, determined users can always find a way to execute scripts even in environments with blocked scripts by group policy. Try running the provided code snippet in a lab environment where scripts are blocked and see that scripts can still be executed.
$context = $ExecutionContext.GetType().GetField('_context', 'NonPublic, Instance').GetValue($ExecutionContext)
$field = $context.GetType().GetField('_authorizationManager', 'NonPublic, Instance')
$field.SetValue($context, (New-Object System.Management.Automation.AuthorizationManager 'Microsoft.PowerShell'))
Malware has long been using PowerShell regardless of execution policies in place.
Therefore, as Wasif mentioned, you can confidently use RemoteSigned without any hesitation ;)
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