CVE-2022-21682 (GCVE-0-2022-21682)

Vulnerability from cvelistv5 – Published: 2022-01-13 00:00 – Updated: 2024-08-03 02:46
VLAI
Title
flatpak-builder can access files outside the build directory.
Summary
Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies `finish-args` last in the build. At this point the build directory will have the full access that is specified in the manifest, so running `flatpak build` against it will gain those permissions. Normally this will not be done, so this is not problem. However, if `--mirror-screenshots-url` is specified, then flatpak-builder will launch `flatpak build --nofilesystem=host appstream-utils mirror-screenshots` after finalization, which can lead to issues even with the `--nofilesystem=host` protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the `appstream-util` binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of `--nofilesystem=home` and `--nofilesystem=host`.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Vendor Product Version
flatpak flatpak Affected: >= 1.11.0, < 1.12.3
Affected: < 1.10.6
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Sin embargo, si se especifica \\\"--mirror-screenshots-url\\\", entonces flatpak-builder lanzar\u00e1 \\\"flatpak build --nofilesystem=host appstream-utils mirror-screenshots\\\" tras la finalizaci\u00f3n, lo que puede conllevar a problemas incluso con la protecci\u00f3n \\\"--nofilesystem=host\\\". En un uso normal, el \u00fanico problema es que estos directorios vac\u00edos pueden crearse en cualquier lugar donde el usuario tenga permisos de escritura. Sin embargo, una aplicaci\u00f3n maliciosa podr\u00eda reemplazar el binario \\\"appstream-util\\\" y potencialmente hacer algo m\u00e1s hostil. Esto ha sido resuelto en Flatpak versiones 1.12.3 y 1.10.6, al cambiar el comportamiento de \\\"--nofilesystem=home\\\" y 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  }
}


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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.