github - GHSA-mj4x-wcxf-hm8x

GHSA-MJ4X-WCXF-HM8X

Vulnerability from github – Published: 2018-07-31 18:13 – Updated: 2023-08-25 23:55

Summary

Json-jwt did not verify the cryptographic signature for data

Details

The json-jwt rubygem version >= 0.5.0 && < 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 1.9.4 and later.

Severity ?

5.3 (Medium)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "json-jwt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.5.1"
            },
            {
              "fixed": "1.9.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2018-1000539"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-06-16T21:46:30Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "The json-jwt rubygem version \u003e= 0.5.0 \u0026\u0026 \u003c 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 1.9.4 and later.",
  "id": "GHSA-mj4x-wcxf-hm8x",
  "modified": "2023-08-25T23:55:12Z",
  "published": "2018-07-31T18:13:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1000539"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nov/json-jwt/pull/62"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nov/json-jwt/commit/a3b2147f0f6d9aca653e7a30e453d3a92b33413f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nov/json-jwt"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/json-jwt/CVE-2018-1000539.yml"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2018/dsa-4283"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Json-jwt did not verify the cryptographic signature for data"
}

GSD-2018-1000539

Vulnerability from gsd - Updated: 2018-04-30 00:00

Details

Ruby's OpenSSL bindings do not check the length of the supplied authentication tag when decrypting an authenticated encryption mode such as AES-GCM, leaving this up to the authors of a gem/app to implement for properly validating the message. json-jwt was not checking for the authentication tag length, meaning that with a one byte tag the JWT would be considered not tampered with. This means that with an average of 128 (max 256) attempts an attacker can forge a valid signature.

Aliases

CVE-2018-1000539

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2018-1000539",
    "description": "Nov json-jwt version \u003e= 0.5.0 \u0026\u0026 \u003c 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 1.9.4 and later.",
    "id": "GSD-2018-1000539",
    "references": [
      "https://www.suse.com/security/cve/CVE-2018-1000539.html",
      "https://www.debian.org/security/2018/dsa-4283"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "json-jwt",
            "purl": "pkg:gem/json-jwt"
          }
        }
      ],
      "aliases": [
        "CVE-2018-1000539",
        "GHSA-mj4x-wcxf-hm8x"
      ],
      "details": "Ruby\u0027s OpenSSL bindings do not check the length of the supplied\nauthentication tag when decrypting an authenticated encryption mode\nsuch as AES-GCM, leaving this up to the authors of a gem/app to\nimplement for properly validating the message.\n\njson-jwt was not checking for the authentication tag length, meaning\nthat with a one byte tag the JWT would be considered not tampered\nwith. This means that with an average of 128 (max 256) attempts an\nattacker can forge a valid signature.\n",
      "id": "GSD-2018-1000539",
      "modified": "2018-04-30T00:00:00.000Z",
      "published": "2018-04-30T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://github.com/nov/json-jwt/pull/62"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 5.3,
          "type": "CVSS_V3"
        }
      ],
      "summary": "Auth tag forgery vulnerability with AES-GCM encrypted JWT"
    }
  },
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        "REQUESTER": "bartdewater@gmail.com",
        "STATE": "PUBLIC"
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          }
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      "gem": "json-jwt",
      "ghsa": "mj4x-wcxf-hm8x",
      "patched_versions": [
        "\u003e= 1.9.4"
      ],
      "title": "Auth tag forgery vulnerability with AES-GCM encrypted JWT",
      "unaffected_versions": [
        "\u003c 0.5.1"
      ],
      "url": "https://github.com/nov/json-jwt/pull/62"
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003e=0.5.0 \u003c1.9.4",
          "affected_versions": "All versions starting from 0.5.0 before 1.9.4",
          "cvss_v2": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "cvss_v3": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-347",
            "CWE-937"
          ],
          "date": "2018-09-02",
          "description": "`json-jwt` is vulnerable to improper verification of cryptographic signatures when decrypting AES-GCM encrypted JSON Web Tokens. This can result in an attacker being able to forge an authentication tag.",
          "fixed_versions": [
            "1.9.4"
          ],
          "identifier": "CVE-2018-1000539",
          "identifiers": [
            "CVE-2018-1000539"
          ],
          "not_impacted": "All versions before 0.5.0, all versions starting from 1.9.4",
          "package_slug": "gem/json-jwt",
          "pubdate": "2018-06-26",
          "solution": "Upgrade to version 1.9.4 or above.",
          "title": "Improper Verification of Cryptographic Signature",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2018-1000539"
          ],
          "uuid": "391c843a-cf49-4660-b5b0-e7178d0f1377"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
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        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:json-jwt_project:json-jwt:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.9.4",
                "versionStartIncluding": "0.5.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
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            }
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        },
        "problemtype": {
          "problemtype_data": [
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        "references": {
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        }
      },
      "impact": {
        "baseMetricV2": {
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "confidentialityImpact": "NONE",
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          },
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          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2018-09-02T10:29Z",
      "publishedDate": "2018-06-26T16:29Z"
    }
  }
}

CVE-2018-1000539 (GCVE-0-2018-1000539)

Vulnerability from cvelistv5 – Published: 2018-06-26 16:00 – Updated: 2024-08-05 12:40

Summary

Nov json-jwt version >= 0.5.0 && < 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 1.9.4 and later.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://github.com/nov/json-jwt/pull/62	x_refsource_MISC
	https://www.debian.org/security/2018/dsa-4283	vendor-advisoryx_refsource_DEBIAN

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-MJ4X-WCXF-HM8X

GSD-2018-1000539

CVE-2018-1000539 (GCVE-0-2018-1000539)

Tags

Sightings

Nomenclature