fix shell command built from environment values

[odaysec]

https://github.com/segmentio/analytics-next/blob/80ef0bee716ee616ce9369da946be2999f3fe3a4/packages/browser/scripts/vendor/run.js#L6-L12

Fix the issue will replace the use of execSync with execFileSync and pass the command arguments separately. This approach avoids shell interpretation of the dynamically constructed command string. Specifically:

1. Replace the dynamic command string `yarn webpack --config ${configPath}` with the command yarn and arguments ['webpack', '--config', configPath].
2. Update the execSync call to use execFileSync with the new command and arguments.

This change ensures that the configPath value is treated as a literal argument and not subject to shell interpretation.

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References

• Command Injection
• CWE-78
• CWE-88

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