GHSA-94hh-pjjg-rwmr
Suggest an improvement- 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
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-94hh-pjjg-rwmr
- Aliases
- Published
- 2021-04-19T14:58:49Z
- Modified
- 2023-11-08T04:05:34.260063Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- Padding Oracle Attack due to Observable Timing Discrepancy in jose-browser-runtime
- 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
JWEDecryptionFailedwould 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
- Name
- jose-browser-runtime
- View open source insights on deps.dev
- Purl
- pkg:npm/jose-browser-runtime