CVE-2021-29444 – jose-browser-runtime

Package

Manager: npm
Name: jose-browser-runtime
Vulnerable Version: >=0 <3.11.4

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00394 pctl0.59512

Details

Padding Oracle Attack due to Observable Timing Discrepancy in jose-browser-runtime ### Impact [AES_CBC_HMAC_SHA2 Algorithm](https://tools.ietf.org/html/rfc7518#section-5.2) (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.

Metadata

Created: 2021-04-19T14:58:49Z
Modified: 2023-03-17T17:49:50Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-94hh-pjjg-rwmr/GHSA-94hh-pjjg-rwmr.json
CWE IDs: ["CWE-203"]
Alternative ID: GHSA-94hh-pjjg-rwmr
Finding: F026
Auto approve: 1