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osvGoogleOSV:CVE-2021-29446
HistoryApr 16, 2021 - 10:15 p.m.

CVE-2021-29446

2021-04-1622:15:14
Google
osv.dev
4

AI Score

6.8

Confidence

Low

EPSS

0.001

Percentile

51.2%

jose-node-cjs-runtime is an npm package which provides a number of cryptographic functions. In versions prior to 3.11.4 the AES_CBC_HMAC_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). 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.

AI Score

6.8

Confidence

Low

EPSS

0.001

Percentile

51.2%