GHSA-94hh-pjjg-rwmr

Source
https://github.com/advisories/GHSA-94hh-pjjg-rwmr
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-94hh-pjjg-rwmr/GHSA-94hh-pjjg-rwmr.json
Aliases
Published
2021-04-19T14:58:49Z
Modified
2023-11-08T04:05:34.260063Z
Details

Impact

AESCBCHMAC_SHA2 Algorithm (A128CBC-HS256, A192CBC-HS384, A256CBC-HS512) decryption would always execute both HMAC tag verification and CBC decryption, if either failed JWEDecryptionFailed would be thrown. But a possibly observable difference in timing when padding error would occur while decrypting the ciphertext makes a padding oracle and an adversary might be able to make use of that oracle to decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block).

Patches

A patch was released which ensures the HMAC tag is verified before performing CBC decryption. The fixed versions are >=3.11.4.

Users should upgrade to ^3.11.4.

Credits

Thanks to Morgan Brown of Microsoft for bringing this up and Eva Sarafianou (@esarafianou) for helping to score this advisory.

References

Affected packages

npm / jose-browser-runtime

Package

Affected ranges

Type
SEMVER
Events
Introduced
0The exact introduced commit is unknown
Fixed
3.11.4