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cveGitHub_MCVE-2023-48223
HistoryNov 20, 2023 - 6:15 p.m.

CVE-2023-48223

2023-11-2018:15:07
CWE-20
GitHub_M
web.nvd.nist.gov
25
cve-2023-48223
fast-jwt
jwt
algorithm confusion
public key
pem format
rs256
hs256
vulnerability

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

20.3%

fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to version 3.3.2, the fast-jwt library does not properly prevent JWT algorithm confusion for all public key types. The ‘publicKeyPemMatcher’ in ‘fast-jwt/src/crypto.js’ does not properly match all common PEM formats for public keys. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application. This attack will only work if the victim application utilizes a public key containing the BEGIN RSA PUBLIC KEY header. Applications using the RS256 algorithm, a public key with a BEGIN RSA PUBLIC KEY header, and calling the verify function without explicitly providing an algorithm, are vulnerable to this algorithm confusion attack which allows attackers to sign arbitrary payloads which will be accepted by the verifier. Version 3.3.2 contains a patch for this issue. As a workaround, change line 29 of blob/master/src/crypto.js to include a regular expression.

Affected configurations

Nvd
Vulners
Node
nearformfast-jwtRange<3.3.2node.js
VendorProductVersionCPE
nearformfast-jwt*cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*

CNA Affected

[
  {
    "vendor": "nearform",
    "product": "fast-jwt",
    "versions": [
      {
        "version": "< 3.3.2",
        "status": "affected"
      }
    ]
  }
]

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

20.3%

Related for CVE-2023-48223