cvelist/2021/32xxx/CVE-2021-32807.json

{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-32807",
        "STATE": "PUBLIC",
        "TITLE": "Remote Code Execution via unsafe classes in otherwise permitted modules"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "AccessControl",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": ">= 4.0, < 4.3"
                                        },
                                        {
                                            "version_value": ">= 5.0, < 5.2"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "zopefoundation"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "The module `AccessControl` defines security policies for Python code used in restricted code within Zope applications. Restricted code is any code that resides in Zope's object database, such as the contents of `Script (Python)` objects. The policies defined in `AccessControl` severely restrict access to Python modules and only exempt a few that are deemed safe, such as Python's `string` module. However, full access to the `string` module also allows access to the class `Formatter`, which can be overridden and extended within `Script (Python)` in a way that provides access to other unsafe Python libraries. Those unsafe Python libraries can be used for remote code execution. By default, you need to have the admin-level Zope \"Manager\" role to add or edit `Script (Python)` objects through the web. Only sites that allow untrusted users to add/edit these scripts through the web - which would be a very unusual configuration to begin with - are at risk. The problem has been fixed in AccessControl 4.3 and 5.2. Only AccessControl versions 4 and 5 are vulnerable, and only on Python 3, not Python 2.7. As a workaround, a site administrator can restrict adding/editing `Script (Python)` objects through the web using the standard Zope user/role permission mechanisms. Untrusted users should not be assigned the Zope Manager role and adding/editing these scripts through the web should be restricted to trusted users only. This is the default configuration in Zope."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-qcx9-j53g-ccgf",
                "refsource": "CONFIRM",
                "url": "https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-qcx9-j53g-ccgf"
            },
            {
                "name": "https://github.com/zopefoundation/AccessControl/commit/b42dd4badf803bb9fb71ac34cd9cb0c249262f2c",
                "refsource": "MISC",
                "url": "https://github.com/zopefoundation/AccessControl/commit/b42dd4badf803bb9fb71ac34cd9cb0c249262f2c"
            },
            {
                "name": "https://github.com/zopefoundation/AccessControl/blob/master/CHANGES.rst#51-2021-07-30",
                "refsource": "MISC",
                "url": "https://github.com/zopefoundation/AccessControl/blob/master/CHANGES.rst#51-2021-07-30"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-qcx9-j53g-ccgf",
        "discovery": "UNKNOWN"
    }
}