CVE-2021-41106

Summary

JWT is a library to work with JSON Web Token and JSON Web Signature. Prior to versions 3.4.6, 4.0.4, and 4.1.5, users of HMAC-based algorithms (HS256, HS384, and HS512) combined with Lcobucci\JWT\Signer\Key\LocalFileReference as key are having their tokens issued/validated using the file path as hashing key - instead of the contents. The HMAC hashing functions take any string as input and, since users can issue and validate tokens, users are lead to believe that everything works properly. Versions 3.4.6, 4.0.4, and 4.1.5 have been patched to always load the file contents, deprecated the Lcobucci\JWT\Signer\Key\LocalFileReference, and suggest Lcobucci\JWT\Signer\Key\InMemory as the alternative. As a workaround, use Lcobucci\JWT\Signer\Key\InMemory instead of Lcobucci\JWT\Signer\Key\LocalFileReference to create the instances of one's keys.

Affected Software

VendorProductVersion RangeStatus
lcobuccijwt>= 3.4.0, < 3.4.6affected
lcobuccijwt>= 4.0.0, < 4.0.4affected
lcobuccijwt>= 4.1.0, < 4.1.5affected

Weaknesses

  • CWE-345: CWE-345: Insufficient Verification of Data Authenticity

ADP Enrichment

CVE Program Container

Additional References

References