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Advisories

python-jose through 3.5.0 Authentication Bypass via Empty HMAC Key

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Severity
critical
Date
Affecting

  • python-jose <= 3.5.0

CWE
  • CWE-347 Improper Verification of Cryptographic Signature
CVSS
9.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
Gavin Blacklock, Conner Webber
Description
python-jose through 3.5.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge JWTs because HMACKey and CryptographyHMACKey accept zero-length HMAC secrets. When an application's HS256/HS384/HS512 verification key resolves to empty, such as an oct JWK with empty k, attackers can forge tokens with arbitrary claims that jwt.decode accepts.

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