GSD-2021-38305

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python's eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale.
Aliases
Aliases
CVE-2021-38305
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{
  "GSD": {
    "alias": "CVE-2021-38305",
    "description": "23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python\u0027s eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale.",
    "id": "GSD-2021-38305"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-38305"
      ],
      "details": "23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python\u0027s eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale.",
      "id": "GSD-2021-38305",
      "modified": "2023-12-13T01:23:17.885386Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ID": "CVE-2021-38305",
        "STATE": "PUBLIC"
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      "affects": {
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              "product": {
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                    "product_name": "n/a",
                    "version": {
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                          "version_value": "n/a"
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            "value": "23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python\u0027s eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale."
          }
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        "reference_data": [
          {
            "name": "https://github.com/23andMe/Yamale/releases/tag/3.0.8",
            "refsource": "MISC",
            "url": "https://github.com/23andMe/Yamale/releases/tag/3.0.8"
          },
          {
            "name": "https://github.com/23andMe/Yamale/pull/165",
            "refsource": "MISC",
            "url": "https://github.com/23andMe/Yamale/pull/165"
          }
        ]
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c3.0.8",
          "affected_versions": "All versions before 3.0.8",
          "cvss_v2": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-937"
          ],
          "date": "2021-08-17",
          "description": "23andMe Yamale allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses `eval` as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python\u0027s eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale.",
          "fixed_versions": [
            "3.0.8"
          ],
          "identifier": "CVE-2021-38305",
          "identifiers": [
            "CVE-2021-38305"
          ],
          "not_impacted": "All versions starting from 3.0.8",
          "package_slug": "pypi/yamale",
          "pubdate": "2021-08-09",
          "solution": "Upgrade to version 3.0.8 or above.",
          "title": "Unrestricted Upload of File with Dangerous Type",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-38305"
          ],
          "uuid": "d5014f8f-9b38-4cec-af70-1bdf4032272b"
        }
      ]
    },
    "nvd.nist.gov": {
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        "nodes": [
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            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:23andme:yamale:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "3.0.8",
                "vulnerable": true
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        "description": {
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              "value": "23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing, and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema, each line is run through Python\u0027s eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus, by exploiting the vulnerability, an attacker can run arbitrary code on the image that invokes Yamale."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-434"
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        "references": {
          "reference_data": [
            {
              "name": "https://github.com/23andMe/Yamale/releases/tag/3.0.8",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Third Party Advisory"
              ],
              "url": "https://github.com/23andMe/Yamale/releases/tag/3.0.8"
            },
            {
              "name": "https://github.com/23andMe/Yamale/pull/165",
              "refsource": "MISC",
              "tags": [
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                "Third Party Advisory"
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              "url": "https://github.com/23andMe/Yamale/pull/165"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 9.3,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 10.0,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2021-08-17T18:46Z",
      "publishedDate": "2021-08-09T21:15Z"
    }
  }
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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