CVE-2021-32635

{"containers": {"cna": {"affected": [{"product": "singularity", "vendor": "sylabs", "versions": [{"status": "affected", "version": ">= 3.7.2, <= 3.7.3"}]}], "descriptions": [{"lang": "en", "value": "Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-923", "description": "CWE-923: Improper Restriction of Communication Channel to Intended Endpoints", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-20", "description": "CWE-20 Improper Input Validation", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-07-22T06:06:44.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/sylabs/singularity/releases/tag/v3.7.4"}, {"name": "GLSA-202107-50", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202107-50"}], "source": {"advisory": "GHSA-5mv9-q7fq-9394", "discovery": "UNKNOWN"}, "title": "Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-32635", "STATE": "PUBLIC", "TITLE": "Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "singularity", "version": {"version_data": [{"version_value": ">= 3.7.2, <= 3.7.3"}]}}]}, "vendor_name": "sylabs"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. 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{"affected": [{"affectedData": [{"product": "singularity", "vendor": "sylabs", "versions": [{"status": "affected", "version": ">= 3.7.2, <= 3.7.3"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:sylabs:singularity:3.7.2:*:*:*:*:*:*:*", "matchCriteriaId": "EBFF7A4E-20CD-40F6-8C48-D4B945A54A76", "vulnerable": true}, {"criteria": "cpe:2.3:a:sylabs:singularity:3.7.3:*:*:*:*:*:*:*", "matchCriteriaId": "D57D9841-5AC2-4FA1-A968-5DB66D9B46FB", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys."}, {"lang": "es", "value": "Singularity es una plataforma de contenedores de c\u00f3digo abierto. En las versiones 3.7.2 y 3.7.3, debido al uso incorrecto de una URL por defecto, los comandos de acci\u00f3n de `singularity` (`run`/`shell`/`exec`) que especifican un contenedor utilizando una URI `library://` siempre intentar\u00e1n recuperar el contenedor desde el punto final remoto por defecto (`cloud.sylabs.io`) en lugar del punto final remoto configurado. Un atacante puede ser capaz de empujar un contenedor malicioso al punto final remoto por defecto con un URI que es id\u00e9ntico al URI utilizado por una v\u00edctima con un punto final remoto no predeterminado, ejecutando as\u00ed el contenedor malicioso. S\u00f3lo se ven afectados los comandos de acci\u00f3n (`run`/`shell`/`exec`) contra URIs `library://`. Otros comandos como `pull` / `push` respetan el endpoint remoto configurado. La vulnerabilidad est\u00e1 parcheada en la versi\u00f3n 3.7.4 de Singularity. Existen dos posibles soluciones: Los usuarios s\u00f3lo pueden interactuar con el endpoint remoto por defecto, o una instalaci\u00f3n puede tener una lista de control de ejecuci\u00f3n configurada para restringir la ejecuci\u00f3n a contenedores firmados con claves seguras espec\u00edficas"}], "id": "CVE-2021-32635", "lastModified": "2026-06-17T03:53:19.233", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.4, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-05-28T21:15:09.020", "references": [{"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/sylabs/singularity/releases/tag/v3.7.4"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202107-50"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/sylabs/singularity/releases/tag/v3.7.4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202107-50"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-923"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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