gsd-2021-21261
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
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.
Aliases
Aliases
CVE-2021-21261


To clipboard 

{
   GSD: {
      alias: "CVE-2021-21261",
      description: "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.",
      id: "GSD-2021-21261",
      references: [
         "https://www.suse.com/security/cve/CVE-2021-21261.html",
         "https://www.debian.org/security/2021/dsa-4830",
         "https://access.redhat.com/errata/RHSA-2021:0411",
         "https://access.redhat.com/errata/RHSA-2021:0307",
         "https://access.redhat.com/errata/RHSA-2021:0306",
         "https://access.redhat.com/errata/RHSA-2021:0304",
         "https://ubuntu.com/security/CVE-2021-21261",
         "https://advisories.mageia.org/CVE-2021-21261.html",
         "https://security.archlinux.org/CVE-2021-21261",
         "https://linux.oracle.com/cve/CVE-2021-21261.html",
      ],
   },
   gsd: {
      metadata: {
         exploitCode: "unknown",
         remediation: "unknown",
         reportConfidence: "confirmed",
         type: "vulnerability",
      },
      osvSchema: {
         aliases: [
            "CVE-2021-21261",
         ],
         details: "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.",
         id: "GSD-2021-21261",
         modified: "2023-12-13T01:23:10.421416Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
      "cve.org": {
         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",
                                    },
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         description: {
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                  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: {
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                        value: "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')",
                     },
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               },
            ],
         },
         references: {
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                  name: "https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2",
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                  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",
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                  url: "https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486",
               },
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                  name: "https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b",
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                  url: "https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b",
               },
               {
                  name: "https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4",
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                  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",
         },
      },
      "nvd.nist.gov": {
         configurations: {
            CVE_data_version: "4.0",
            nodes: [
               {
                  children: [],
                  cpe_match: [
                     {
                        cpe23Uri: "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*",
                        cpe_name: [],
                        versionEndExcluding: "1.8.5",
                        versionStartIncluding: "0.11.4",
                        vulnerable: true,
                     },
                     {
                        cpe23Uri: "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*",
                        cpe_name: [],
                        versionEndExcluding: "1.10.0",
                        versionStartIncluding: "1.9.1",
                        vulnerable: true,
                     },
                  ],
                  operator: "OR",
               },
               {
                  children: [],
                  cpe_match: [
                     {
                        cpe23Uri: "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                        cpe_name: [],
                        vulnerable: true,
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         cve: {
            CVE_data_meta: {
               ASSIGNER: "security-advisories@github.com",
               ID: "CVE-2021-21261",
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            data_type: "CVE",
            data_version: "4.0",
            description: {
               description_data: [
                  {
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                     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.",
                  },
               ],
            },
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            references: {
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                     name: "https://github.com/flatpak/flatpak/releases/tag/1.8.5",
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         },
         impact: {
            baseMetricV2: {
               acInsufInfo: false,
               cvssV2: {
                  accessComplexity: "LOW",
                  accessVector: "LOCAL",
                  authentication: "NONE",
                  availabilityImpact: "COMPLETE",
                  baseScore: 7.2,
                  confidentialityImpact: "COMPLETE",
                  integrityImpact: "COMPLETE",
                  vectorString: "AV:L/AC:L/Au:N/C:C/I:C/A:C",
                  version: "2.0",
               },
               exploitabilityScore: 3.9,
               impactScore: 10,
               obtainAllPrivilege: false,
               obtainOtherPrivilege: false,
               obtainUserPrivilege: false,
               severity: "HIGH",
               userInteractionRequired: false,
            },
            baseMetricV3: {
               cvssV3: {
                  attackComplexity: "LOW",
                  attackVector: "LOCAL",
                  availabilityImpact: "HIGH",
                  baseScore: 8.8,
                  baseSeverity: "HIGH",
                  confidentialityImpact: "HIGH",
                  integrityImpact: "HIGH",
                  privilegesRequired: "LOW",
                  scope: "CHANGED",
                  userInteraction: "NONE",
                  vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  version: "3.1",
               },
               exploitabilityScore: 2,
               impactScore: 6,
            },
         },
         lastModifiedDate: "2021-01-27T19:34Z",
         publishedDate: "2021-01-14T20:15Z",
      },
   },
}


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