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cvelistGitHub_MCVELIST:CVE-2021-29446
HistoryApr 16, 2021 - 10:00 p.m.

CVE-2021-29446 Padding Oracle Attack due to Observable Timing Discrepancy in jose-node-cjs-runtime

2021-04-1622:00:15
CWE-203
GitHub_M
www.cve.org
1

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

6.4

Confidence

High

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.

CNA Affected

[
  {
    "product": "jose-node-cjs-runtime",
    "vendor": "panva",
    "versions": [
      {
        "status": "affected",
        "version": "< 3.11.4"
      }
    ]
  }
]

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

6.4

Confidence

High

EPSS

0.001

Percentile

51.2%

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