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

Vulnerability from cvelistv5 – Published: 2021-10-08 00:00 – Updated: 2024-08-04 02:59
VLAI?
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
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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      "lastModified": "2024-11-21T06:25:33.023",
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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. 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\"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-30T16:11:33.580Z\"}}], \"cna\": {\"title\": \"Sandbox bypass via recent VFS-manipulating syscalls\", \"source\": {\"advisory\": \"GHSA-67h7-w3jq-vh4q\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 8.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"flatpak\", \"product\": \"flatpak\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 1.8.0, \u003c= 1.8.2\"}, {\"status\": \"affected\", \"version\": \"\u003e= 1.10.0, \u003c 1.10.4\"}, {\"status\": \"affected\", \"version\": \"\u003e= 1.11.0, \u003c 1.12.0\"}]}], \"references\": [{\"url\": \"https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/26b12484eb8a6219b9e7aa287b298a894b2f34ca\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aaf\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330\"}, {\"url\": \"https://github.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cf\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5656ONDP2MGKIJMKEC7N2NXCV27WGTC/\", \"name\": \"FEDORA-2021-4b201d15e6\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.debian.org/security/2021/dsa-4984\", \"name\": \"DSA-4984\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/10/26/9\", \"name\": \"[oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T5DKCYRC6MFSTFCUP4DELCOUUP3SFEFX/\", \"name\": \"FEDORA-2021-c5a9c85737\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://security.gentoo.org/glsa/202312-12\", \"name\": \"GLSA-202312-12\", \"tags\": [\"vendor-advisory\"]}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20: Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2023-12-23T10:06:26.199973\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-41133\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T02:59:31.388Z\", \"dateReserved\": \"2021-09-15T00:00:00\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2021-10-08T00:00:00\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.