{
    "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. 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."
            }
        ]
    },
    "impact": {
        "cvss": {
            "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"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-923: Improper Restriction of Communication Channel to Intended Endpoints"
                    }
                ]
            },
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-20 Improper Input Validation"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394",
                "refsource": "CONFIRM",
                "url": "https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394"
            },
            {
                "name": "https://github.com/sylabs/singularity/releases/tag/v3.7.4",
                "refsource": "MISC",
                "url": "https://github.com/sylabs/singularity/releases/tag/v3.7.4"
            },
            {
                "refsource": "GENTOO",
                "name": "GLSA-202107-50",
                "url": "https://security.gentoo.org/glsa/202107-50"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-5mv9-q7fq-9394",
        "discovery": "UNKNOWN"
    }
}