{ "containers": { "cna": { "affected": [ { "product": "flatpak", "vendor": "flatpak", "versions": [ { "status": "affected", "version": ">= 0.11.4, < 1.8.5" }, { "status": "affected", "version": ">= 1.9.0, < 1.10.0" } ] } ], "descriptions": [ { "lang": "en", "value": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. In vulnerable versions, the Flatpak portal service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the `flatpak run` command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by the `flatpak run` command, and use them to execute arbitrary code that is not in a sandbox. As a workaround, this vulnerability can be mitigated by preventing the `flatpak-portal` service from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.10.0." } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-74", "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-01-25T02:06:26", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M" }, "references": [ { "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/flatpak/flatpak/releases/tag/1.8.5" }, { "name": "DSA-4830", "tags": [ "vendor-advisory", "x_refsource_DEBIAN" ], "url": "https://www.debian.org/security/2021/dsa-4830" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba" }, { "name": "GLSA-202101-21", "tags": [ "vendor-advisory", "x_refsource_GENTOO" ], "url": "https://security.gentoo.org/glsa/202101-21" } ], "source": { "advisory": "GHSA-4ppf-fxf6-vxg2", "discovery": "UNKNOWN" }, "title": "Flatpak sandbox escape via spawn portal", "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-21261", "STATE": "PUBLIC", "TITLE": "Flatpak sandbox escape via spawn portal" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "flatpak", "version": { "version_data": [ { "version_value": ">= 0.11.4, < 1.8.5" }, { "version_value": ">= 1.9.0, < 1.10.0" } ] } } ] }, "vendor_name": "flatpak" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. In vulnerable versions, the Flatpak portal service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the `flatpak run` command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by the `flatpak run` command, and use them to execute arbitrary code that is not in a sandbox. As a workaround, this vulnerability can be mitigated by preventing the `flatpak-portal` service from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.10.0." } ] }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')" } ] } ] }, "references": { "reference_data": [ { "name": "https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2", "refsource": "CONFIRM", "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2" }, { "name": "https://github.com/flatpak/flatpak/releases/tag/1.8.5", "refsource": "MISC", "url": "https://github.com/flatpak/flatpak/releases/tag/1.8.5" }, { "name": "DSA-4830", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4830" }, { "name": "https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486", "refsource": "MISC", "url": "https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486" }, { "name": "https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b", "refsource": "MISC", "url": "https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b" }, { "name": "https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4", "refsource": "MISC", "url": "https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4" }, { "name": "https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba", "refsource": "MISC", "url": "https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba" }, { "name": "GLSA-202101-21", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202101-21" } ] }, "source": { "advisory": "GHSA-4ppf-fxf6-vxg2", "discovery": "UNKNOWN" } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:14.989Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_CONFIRM", "x_transferred" ], "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/flatpak/flatpak/releases/tag/1.8.5" }, { "name": "DSA-4830", "tags": [ "vendor-advisory", "x_refsource_DEBIAN", "x_transferred" ], "url": "https://www.debian.org/security/2021/dsa-4830" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba" }, { "name": "GLSA-202101-21", "tags": [ "vendor-advisory", "x_refsource_GENTOO", "x_transferred" ], "url": "https://security.gentoo.org/glsa/202101-21" } ] } ] }, "cveMetadata": { "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21261", "datePublished": "2021-01-14T19:40:21", "dateReserved": "2020-12-22T00:00:00", "dateUpdated": "2024-08-03T18:09:14.989Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }