{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2022-21682",
        "STATE": "PUBLIC",
        "TITLE": "flatpak-builder can access files outside the build directory."
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "flatpak",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": ">= 1.11.0, < 1.12.3"
                                        },
                                        {
                                            "version_value": "< 1.10.6"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "flatpak"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies `finish-args` last in the build. At this point the build directory will have the full access that is specified in the manifest, so running `flatpak build` against it will gain those permissions. Normally this will not be done, so this is not problem. However, if `--mirror-screenshots-url` is specified, then flatpak-builder will launch `flatpak build --nofilesystem=host appstream-utils mirror-screenshots` after finalization, which can lead to issues even with the `--nofilesystem=host` protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the `appstream-util` binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of `--nofilesystem=home` and `--nofilesystem=host`."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx",
                "refsource": "CONFIRM",
                "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx"
            },
            {
                "name": "https://github.com/flatpak/flatpak/commit/445bddeee657fdc8d2a0a1f0de12975400d4fc1a",
                "refsource": "MISC",
                "url": "https://github.com/flatpak/flatpak/commit/445bddeee657fdc8d2a0a1f0de12975400d4fc1a"
            },
            {
                "name": "https://github.com/flatpak/flatpak/commit/4d11f77aa7fd3e64cfa80af89d92567ab9e8e6fa",
                "refsource": "MISC",
                "url": "https://github.com/flatpak/flatpak/commit/4d11f77aa7fd3e64cfa80af89d92567ab9e8e6fa"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-825ca6bf2b",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/"
            },
            {
                "refsource": "DEBIAN",
                "name": "DSA-5049",
                "url": "https://www.debian.org/security/2022/dsa-5049"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-7e328bd66c",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IXKBERLJRYV7KXKGXOLI6IOXVBQNN4DP/"
            },
            {
                "refsource": "GENTOO",
                "name": "GLSA-202312-12",
                "url": "https://security.gentoo.org/glsa/202312-12"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-8ch7-5j3h-g4fx",
        "discovery": "UNKNOWN"
    }
}