Vulnerability in mpdavis python-jose

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/mpdavis/python-jose/blob/3.5.0/jose/backends/cryptography_backend.py
• github.com/mpdavis/python-jose/blob/3.5.0/jose/backends/native.py
• github.com/mpdavis/python-jose/issues/398
• www.vulncheck.com/advisories/python-jose-through-3.5.0-authentication-bypass-via-empty-…