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fernet@0.0.2 vulnerabilities

Javascript implementation of Fernet symmetric encryption https://github.com/kr/fernet-spec

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Direct Vulnerabilities

Known vulnerabilities in the fernet package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • M
Timing Attack

fernet is a Javascript implementation of Fernet symmetric encryption. Affected versions of the package are vulnerable to a timing attack.

The library implemented a character to character comparison, similar to the built-in string comparison mechanism, ===, and not a time constant string comparison. As a result, the comparison will fail faster when the first characters in the HMAC are incorrect. An attacker can use this difference to perform a timing attack, essentially allowing them to guess the HMAC one character at a time.

You can read more about timing attacks in Node.js on the Snyk blog.

How to fix Timing Attack?

Upgrade fernet to version 0.1.0 or higher.

>=0.0.1 <0.1.0
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