| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/lestrrat-go/jwx | < 1.2.26 | 1.2.26 |
| github.com/lestrrat-go/jwx/v2 | < 2.0.11 | 2.0.11 |
Decrypting AES-CBC encrypted JWE has Potential Padding Oracle Attack Vulnerability.
On v2.0.10, decrypting AES-CBC encrypted JWE may return an error "failed to generate plaintext from decrypted blocks: invalid padding":
Reporting padding error causes Padding Oracle Attack Vulnerability. RFC 7516 JSON Web Encryption (JWE) says that we MUST NOT do this.
11.5. Timing Attacks To mitigate the attacks described in RFC 3218 [RFC3218], the recipient MUST NOT distinguish between format, padding, and length errors of encrypted keys. It is strongly recommended, in the event of receiving an improperly formatted key, that the recipient substitute a randomly generated CEK and proceed to the next step, to mitigate timing attacks.
In addition, the time to remove padding depends on the length of the padding. It may leak the length of the padding by Timing Attacks.
To mitigate Timing Attacks, it MUST be done in constant time.
The authentication tag is verified, so it is not an immediate attack.
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