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GMS-2020-742: Forgeable Public/Private Tokens in jws

September 1, 2020 (updated September 23, 2021)

Affected versions of the jws package allow users to select what algorithm the server will use to verify a provided JWT. A malicious actor can use this behaviour to arbitrarily modify the contents of a JWT while still passing verification. For the common use case of the JWT as a bearer token, the end result is a complete authentication bypass with minimal effort.

Recommendation

Update to version 3.0.0 or later.

References

  • auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/
  • github.com/advisories/GHSA-gjcw-v447-2w7q
  • github.com/brianloveswords/node-jws/commit/585d0e1e97b6747c10cf5b7689ccc5618a89b299
  • nvd.nist.gov/vuln/detail/CVE-2016-1000223
  • snyk.io/vuln/npm:jws:20160726
  • www.npmjs.com/advisories/88

Code Behaviors & Features

Detect and mitigate GMS-2020-742 with GitLab Dependency Scanning

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Affected versions

All versions before 3.0.0

Fixed versions

  • 3.0.0

Solution

Upgrade to version 3.0.0 or above.

Source file

npm/jws/GMS-2020-742.yml

Spotted a mistake? Edit the file on GitLab.

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