CVE-2021-39135

{"containers": {"cna": {"affected": [{"product": "arborist", "vendor": "npm", "versions": [{"status": "affected", "version": "< 2.8.2"}]}], "descriptions": [{"lang": "en", "value": "`@npmcli/arborist`, the library that calculates dependency trees and manages the node_modules folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is accomplished by extracting package contents into a project's `node_modules` folder. If the `node_modules` folder of the root project or any of its dependencies is somehow replaced with a symbolic link, it could allow Arborist to write package dependencies to any arbitrary location on the file system. Note that symbolic links contained within package artifact contents are filtered out, so another means of creating a `node_modules` symbolic link would have to be employed. 1. A `preinstall` script could replace `node_modules` with a symlink. (This is prevented by using `--ignore-scripts`.) 2. An attacker could supply the target with a git repository, instructing them to run `npm install --ignore-scripts` in the root. This may be successful, because `npm install --ignore-scripts` is typically not capable of making changes outside of the project directory, so it may be deemed safe. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. For more information including workarounds please see the referenced GHSA-gmw6-94gg-2rc2."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-61", "description": "CWE-61: UNIX Symbolic Link (Symlink) Following", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-03-08T14:07:30.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://www.npmjs.com/package/%40npmcli/arborist"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2"}, {"tags": ["x_refsource_MISC"], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}], "source": {"advisory": "GHSA-gmw6-94gg-2rc2", "discovery": "UNKNOWN"}, "title": "UNIX Symbolic Link (Symlink) Following in @npmcli/arborist", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-39135", "STATE": "PUBLIC", "TITLE": "UNIX Symbolic Link (Symlink) Following in @npmcli/arborist"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "arborist", "version": {"version_data": [{"version_value": "< 2.8.2"}]}}]}, "vendor_name": "npm"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "`@npmcli/arborist`, the library that calculates dependency trees and manages the node_modules folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is accomplished by extracting package contents into a project's `node_modules` folder. If the `node_modules` folder of the root project or any of its dependencies is somehow replaced with a symbolic link, it could allow Arborist to write package dependencies to any arbitrary location on the file system. Note that symbolic links contained within package artifact contents are filtered out, so another means of creating a `node_modules` symbolic link would have to be employed. 1. A `preinstall` script could replace `node_modules` with a symlink. (This is prevented by using `--ignore-scripts`.) 2. An attacker could supply the target with a git repository, instructing them to run `npm install --ignore-scripts` in the root. This may be successful, because `npm install --ignore-scripts` is typically not capable of making changes outside of the project directory, so it may be deemed safe. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. For more information including workarounds please see the referenced GHSA-gmw6-94gg-2rc2."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-61: UNIX Symbolic Link (Symlink) Following"}]}]}, "references": {"reference_data": [{"name": "https://www.npmjs.com/package/@npmcli/arborist", "refsource": "MISC", "url": "https://www.npmjs.com/package/@npmcli/arborist"}, {"name": "https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2", "refsource": "CONFIRM", "url": "https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2"}, {"name": "https://www.oracle.com/security-alerts/cpuoct2021.html", "refsource": "MISC", "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"name": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf", "refsource": "CONFIRM", "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}]}, "source": {"advisory": "GHSA-gmw6-94gg-2rc2", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T01:58:18.069Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.npmjs.com/package/%40npmcli/arborist"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-39135", "datePublished": "2021-08-31T17:10:10.000Z", "dateReserved": "2021-08-16T00:00:00.000Z", "dateUpdated": "2024-08-04T01:58:18.069Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

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This is accomplished by extracting package contents into a project's `node_modules` folder. If the `node_modules` folder of the root project or any of its dependencies is somehow replaced with a symbolic link, it could allow Arborist to write package dependencies to any arbitrary location on the file system. Note that symbolic links contained within package artifact contents are filtered out, so another means of creating a `node_modules` symbolic link would have to be employed. 1. A `preinstall` script could replace `node_modules` with a symlink. (This is prevented by using `--ignore-scripts`.) 2. An attacker could supply the target with a git repository, instructing them to run `npm install --ignore-scripts` in the root. This may be successful, because `npm install --ignore-scripts` is typically not capable of making changes outside of the project directory, so it may be deemed safe. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. For more information including workarounds please see the referenced GHSA-gmw6-94gg-2rc2."}, {"lang": "es", "value": "\"@npmcli/arborist\", la biblioteca que calcula los \u00e1rboles de dependencia y maneja la jerarqu\u00eda de carpetas node_modules para la interfaz de l\u00ednea de comandos de npm, tiene como objetivo garantizar que se cumplan los contratos de dependencia de los paquetes, y que la extracci\u00f3n del contenido de los paquetes sea llevada a cabo siempre en la carpeta esperada. Esto es conseguido extrayendo el contenido de los paquetes en la carpeta \"node_modules\" de un proyecto. Si la carpeta \"node_modules\" del proyecto root o cualquiera de sus dependencias se sustituye de alg\u00fan modo por un enlace simb\u00f3lico, podr\u00eda permitir a Arborist escribir las dependencias de los paquetes en cualquier ubicaci\u00f3n arbitraria del sistema de archivos. Tenga en cuenta que los enlaces simb\u00f3licos contenidos en los artefactos de los paquetes se filtran, por lo que habr\u00eda que emplear otro medio para crear un enlace simb\u00f3lico \"node_modules\". 1. Un script \"preinstall\" podr\u00eda sustituir \"node_modules\" por un enlace simb\u00f3lico. (Esto es impedido usando \"--ignore-scripts\".) 2. Un atacante podr\u00eda suministrar al objetivo un repositorio git, indic\u00e1ndole que ejecute \"npm install --ignore-scripts\" en root. Esto podr\u00eda tener \u00e9xito, porque \"npm install --ignore-scripts\" no suele ser capaz de realizar cambios fuera del directorio del proyecto, por lo que podr\u00eda considerarse seguro. Esto est\u00e1 parcheado en @npmcli/arborist versi\u00f3n 2.8.2 que se incluye en npm versiones v7.20.7 y superiores. Para m\u00e1s informaci\u00f3n, incluyendo soluciones, consulte la referencia documento GHSA-gmw6-94gg-2rc2"}], "id": "CVE-2021-39135", "lastModified": "2026-06-17T04:03:08.153", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.4, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"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, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-31T17:15:08.207", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2"}, {"source": "security-advisories@github.com", "url": "https://www.npmjs.com/package/%40npmcli/arborist"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.npmjs.com/package/%40npmcli/arborist"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-61"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-59"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "nodejs-arborist: symlink following vulnerability", "id": "1999745", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1999745"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-59", "details": ["`@npmcli/arborist`, the library that calculates dependency trees and manages the node_modules folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is accomplished by extracting package contents into a project's `node_modules` folder. If the `node_modules` folder of the root project or any of its dependencies is somehow replaced with a symbolic link, it could allow Arborist to write package dependencies to any arbitrary location on the file system. Note that symbolic links contained within package artifact contents are filtered out, so another means of creating a `node_modules` symbolic link would have to be employed. 1. A `preinstall` script could replace `node_modules` with a symlink. (This is prevented by using `--ignore-scripts`.) 2. An attacker could supply the target with a git repository, instructing them to run `npm install --ignore-scripts` in the root. This may be successful, because `npm install --ignore-scripts` is typically not capable of making changes outside of the project directory, so it may be deemed safe. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. For more information including workarounds please see the referenced GHSA-gmw6-94gg-2rc2.", "A flaw was found in nodejs-arborist. Arborist could write package dependencies to any arbitrary location on the file system if an attacker had replaced a project folder with a symbolic link in the node_modules folder. The highest threat from this vulnerability is to data integrity and system availability."], "name": "CVE-2021-39135", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "nodejs:12/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "nodejs:14/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "nodejs:16/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Not affected", "package_name": "rh-nodejs12-nodejs", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Not affected", "package_name": "rh-nodejs14-nodejs", "product_name": "Red Hat Software Collections"}], "public_date": "2021-08-31T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-39135\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-39135"], "threat_severity": "Important"}

{}