gsd-2021-41133
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak's denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version.
Aliases
Aliases
CVE-2021-41133


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-41133",
    "description": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak\u0027s denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version.",
    "id": "GSD-2021-41133",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-41133.html",
      "https://www.debian.org/security/2021/dsa-4984",
      "https://access.redhat.com/errata/RHSA-2021:4107",
      "https://access.redhat.com/errata/RHSA-2021:4106",
      "https://access.redhat.com/errata/RHSA-2021:4044",
      "https://access.redhat.com/errata/RHSA-2021:4042",
      "https://ubuntu.com/security/CVE-2021-41133",
      "https://advisories.mageia.org/CVE-2021-41133.html",
      "https://security.archlinux.org/CVE-2021-41133",
      "https://linux.oracle.com/cve/CVE-2021-41133.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-41133"
      ],
      "details": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak\u0027s denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version.",
      "id": "GSD-2021-41133",
      "modified": "2023-12-13T01:23:27.200341Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-41133",
        "STATE": "PUBLIC",
        "TITLE": "Sandbox bypass via recent VFS-manipulating syscalls"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "flatpak",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "\u003e= 1.8.0, \u003c= 1.8.2"
                        },
                        {
                          "version_value": "\u003e= 1.10.0, \u003c 1.10.4"
                        },
                        {
                          "version_value": "\u003e= 1.11.0, \u003c 1.12.0"
                        }
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              "vendor_name": "flatpak"
            }
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      },
      "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. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak\u0027s denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version."
          }
        ]
      },
      "impact": {
        "cvss": {
          "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"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-20: Improper Input Validation"
              }
            ]
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      },
      "references": {
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            "name": "https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q",
            "refsource": "CONFIRM",
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          },
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          {
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            "url": "https://github.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aaf"
          },
          {
            "name": "https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36",
            "refsource": "MISC",
            "url": "https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36"
          },
          {
            "name": "https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48",
            "refsource": "MISC",
            "url": "https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48"
          },
          {
            "name": "https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f",
            "refsource": "MISC",
            "url": "https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f"
          },
          {
            "name": "https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330",
            "refsource": "MISC",
            "url": "https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330"
          },
          {
            "name": "https://github.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cf",
            "refsource": "MISC",
            "url": "https://github.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cf"
          },
          {
            "name": "FEDORA-2021-4b201d15e6",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R5656ONDP2MGKIJMKEC7N2NXCV27WGTC/"
          },
          {
            "name": "DSA-4984",
            "refsource": "DEBIAN",
            "url": "https://www.debian.org/security/2021/dsa-4984"
          },
          {
            "name": "[oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/10/26/9"
          },
          {
            "name": "FEDORA-2021-c5a9c85737",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T5DKCYRC6MFSTFCUP4DELCOUUP3SFEFX/"
          },
          {
            "name": "GLSA-202312-12",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202312-12"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-67h7-w3jq-vh4q",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
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        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak\u0027s denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version."
          },
          {
            "lang": "es",
            "value": "Flatpak es un sistema para construir, distribuir y ejecutar aplicaciones de escritorio en sandbox en Linux. En versiones anteriores a 1.10.4 y 1.12.0, las aplicaciones Flatpak con acceso directo a los sockets AF_UNIX, como los usados por Wayland, Pipewire o pipewire-pulse, pueden enga\u00f1ar a los portales y otros servicios del sistema operativo anfitri\u00f3n para que traten la aplicaci\u00f3n Flatpak como si fuera un proceso ordinario del Sistema Operativo anfitri\u00f3n sin sandbox. Pueden hacer esto al manipular el VFS usando recientes llamadas al sistema relacionadas con el montaje que no est\u00e1n bloqueadas por el filtro seccomp de Flatpak, para sustituir un \"/.flatpak-info\" dise\u00f1ado o hacer que ese archivo desaparezca por completo. Las aplicaciones Flatpak que act\u00faan como clientes de sockets AF_UNIX como los usados por Wayland, Pipewire o pipewire-pulse pueden escalar los privilegios que los servicios correspondientes creer\u00e1n que presenta la aplicaci\u00f3n Flatpak. Ten en cuenta que los protocolos que operan completamente sobre el bus de sesi\u00f3n D-Bus (bus de usuario), el bus de sistema o el bus de accesibilidad no est\u00e1n afectados por esto. Esto es debido al uso de un proceso proxy \"xdg-dbus-proxy\", cuyo VFS no puede ser manipulado por la app Flatpak, cuando interact\u00faa con estos buses. Se presentan parches para las versiones 1.10.4 y 1.12.0, y en el momento de la publicaci\u00f3n, se est\u00e1 planeando un parche para la versi\u00f3n 1.8.2. No se presentan soluciones aparte de la actualizaci\u00f3n a una versi\u00f3n parcheada"
          }
        ],
        "id": "CVE-2021-41133",
        "lastModified": "2023-12-23T10:15:08.590",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "LOCAL",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 4.6,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 6.4,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
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              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
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                "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": 2.0,
              "impactScore": 6.0,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2021-10-08T14:15:08.723",
        "references": [
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            "source": "security-advisories@github.com",
            "tags": [
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            "url": "http://www.openwall.com/lists/oss-security/2021/10/26/9"
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          },
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              "Third Party Advisory"
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          },
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            "tags": [
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            "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5656ONDP2MGKIJMKEC7N2NXCV27WGTC/"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T5DKCYRC6MFSTFCUP4DELCOUUP3SFEFX/"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://security.gentoo.org/glsa/202312-12"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.debian.org/security/2021/dsa-4984"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-Other"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-20"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.