CVE-2021-41133 (GCVE-0-2021-41133)

Vulnerability from cvelistv5 – Published: 2021-10-08 00:00 – Updated: 2024-08-04 02:59
VLAI
Title
Sandbox bypass via recent VFS-manipulating syscalls
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version
flatpak flatpak Affected: >= 1.8.0, <= 1.8.2
Affected: >= 1.10.0, < 1.10.4
Affected: >= 1.11.0, < 1.12.0
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flatpak flatpak Affected: 1.10.0 , ≤ 1.10.4 (custom)
Affected: 1.11.0 , < 1.12.0 (custom)
Affected: 1.8.0 , < 1.8.2 (custom)
    cpe:2.3:a:flatpak:flatpak:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:flatpak:1.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:flatpak:1.8.0:*:*:*:*:*:*:*
 Create a notification for this product.
fedoraproject fedora Affected: 34
    cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
 Create a notification for this product.
fedoraproject fedora Affected: 33
    cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
 Create a notification for this product.
debian debian_linux Affected: 11.0
    cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website
To clipboard 

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      "lastModified": "2024-11-21T06:25:33.023",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-41133\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2021-10-08T14:15:08.723\",\"lastModified\":\"2026-06-17T04:07:56.370\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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. 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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. 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      "cveMetadata": "{\"cveId\": \"CVE-2021-41133\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T02:59:31.388Z\", \"dateReserved\": \"2021-09-15T00:00:00.000Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2021-10-08T00:00:00.000Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.