### [CVE-2017-12973](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12973)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

Nimbus JOSE+JWT before 4.39 proceeds improperly after detection of an invalid HMAC in authenticated AES-CBC decryption, which allows attackers to conduct a padding oracle attack.

### POC

#### Reference
- https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/6a29f10f723f406eb25555f55842c59a43a38912
- https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/223/aescbc-return-immediately-on-invalid-hmac
- https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt

#### Github
No PoCs found on GitHub currently.