CVE-2021-29444

CVE-2021-29444 · Padding Oracle Attack due to Observable Timing Discrepancy in jose-browser-runtime

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jose-browser-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`.

CVSS 5.9 · Mittel · EPSS 1,1% · Korrektur verfügbar

Veröffentlicht

2021-04-16T21:45:16.000Z

Aktualisiert

2024-08-03T22:02:51.935Z

Technologie-Stack: node

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