CVE-2023-37464 Incorrect Authentication Tag length usage in AES GCM decryption in OpenIDC/cjose

2023-07-1420:25:18

CWE-327

GitHub_M

www.cve.org

cve-2023-37464

openidc/cjose

aes gcm decryption

authentication tag length

jwe

encryption algorithm

upgrade

CVSS3

8.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

Confidence

High

EPSS

0.003

Percentile

65.9%

JSON

OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec says that a fixed length of 16 octets must be applied. Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC).

CNA Affected

[
  {
    "vendor": "OpenIDC",
    "product": "cjose",
    "versions": [
      {
        "version": "< 0.6.2.2",
        "status": "affected"
      }
    ]
  }
]