Vulnerability-Lookup

FKIE_CVE-2021-21373

Vulnerability from fkie_nvd - Published: 2021-03-26 22:15 - Updated: 2026-06-17 03:35

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, "nimble refresh" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.

References

URL	Tags
security-advisories@github.com	https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/	Exploit, Third Party Advisory
security-advisories@github.com	https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130	Release Notes, Third Party Advisory
security-advisories@github.com	https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130	Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8	Third Party Advisory

Impacted products

	Vendor	Product	Version
	nim-lang	nim	*
	nim-lang	nim	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "security",
          "vendor": "nim-lang",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.10"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.4.0, \u003c 1.4.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "895C273A-28A1-4592-8A50-9A8FAAD7D98C",
              "versionEndExcluding": "1.2.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FBDDF104-9FC9-4CED-9F87-26CF1DA2EF4E",
              "versionEndExcluding": "1.4.4",
              "versionStartIncluding": "1.4.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution."
    },
    {
      "lang": "es",
      "value": "Nimble es un administrador de paquetes para el lenguaje de programaci\u00f3n Nim.\u0026#xa0;En las versiones de lanzamiento de Nim anteriores a 1.2.10 y 1.4.4, la \"nimble refresh\" extrae una lista de paquetes de Nimble por medio de HTTPS por defecto.\u0026#xa0;En caso de error, recurre a una URL no TLS http://irclogs.nim-lang.org/packages.json.\u0026#xa0;Un atacante capaz de ejecutar MitM puede entregar una lista de paquetes modificada que contenga paquetes de software malicioso.\u0026#xa0;Si los paquetes son instalados y usados, el ataque se convierte en una ejecuci\u00f3n de c\u00f3digo que no es confiable."
    }
  ],
  "id": "CVE-2021-21373",
  "lastModified": "2026-06-17T03:35:24.930",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.3,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-03-26T22:15:12.773",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-348"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-21373 (GCVE-0-2021-21373)

Vulnerability from cvelistv5 – Published: 2021-03-26 21:25 – Updated: 2024-08-03 18:09

Title

Nimble falls back to insecure http url when fetching packages

Summary

Severity

7.5 (High)


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

CWE

CWE-348 - Use of Less Trusted Source

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://consensys.net/diligence/vulnerabilities/n…	x_refsource_MISC
https://github.com/nim-lang/nimble/blob/master/ch…	x_refsource_MISC
https://github.com/nim-lang/security/security/adv…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
nim-lang	security	Affected: < 1.2.10 Affected: >= 1.4.0, < 1.4.4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:09:15.923Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "tags": [
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              "x_transferred"
            ],
            "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
          },
          {
            "tags": [
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            ],
            "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
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            ],
            "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "security",
          "vendor": "nim-lang",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.10"
            },
            {
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              "version": "\u003e= 1.4.0, \u003c 1.4.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L",
            "version": "3.1"
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      "problemTypes": [
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          "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
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        },
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              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "security",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 1.2.10"
                          },
                          {
                            "version_value": "\u003e= 1.4.0, \u003c 1.4.4"
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}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.