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Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the "xa.metadata" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the "metadata" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.
Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the "xa.metadata" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the "metadata" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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OR
*cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:* versions up to (excluding) 1.10.6
*cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:* versions from (including) 1.11.1 up to (including) 1.12.3
Added
CPE Configuration
OR
*cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Added
CPE Configuration
OR
*cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Added
CPE Configuration
OR
*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
Added
CVSS V2
NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
Added
CVSS V2 Metadata
Victim must voluntarily interact with attack mechanism
Added
CVSS V3.1
NIST AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Added
CWE
NIST CWE-276
Changed
Reference Type
https://github.com/flatpak/flatpak/commit/54ec1a482dfc668127eaae57f135e6a8e0bc52da No Types Assigned
https://github.com/flatpak/flatpak/commit/54ec1a482dfc668127eaae57f135e6a8e0bc52da Patch, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/commit/65cbfac982cb1c83993a9e19aa424daee8e9f042 No Types Assigned
https://github.com/flatpak/flatpak/commit/65cbfac982cb1c83993a9e19aa424daee8e9f042 Patch, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/commit/93357d357119093804df05acc32ff335839c6451 No Types Assigned
https://github.com/flatpak/flatpak/commit/93357d357119093804df05acc32ff335839c6451 Patch, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/commit/ba818f504c926baaf6e362be8159cfacf994310e No Types Assigned
https://github.com/flatpak/flatpak/commit/ba818f504c926baaf6e362be8159cfacf994310e Patch, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/commit/d9a8f9d8ccc0b7c1135d0ecde006a75d25f66aee No Types Assigned
https://github.com/flatpak/flatpak/commit/d9a8f9d8ccc0b7c1135d0ecde006a75d25f66aee Patch, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/releases/tag/1.10.6 No Types Assigned
https://github.com/flatpak/flatpak/releases/tag/1.10.6 Release Notes, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/releases/tag/1.12.3 No Types Assigned
https://github.com/flatpak/flatpak/releases/tag/1.12.3 Release Notes, Third Party Advisory
Changed
Reference Type
https://github.com/flatpak/flatpak/security/advisories/GHSA-qpjc-vq3c-572j No Types Assigned
https://github.com/flatpak/flatpak/security/advisories/GHSA-qpjc-vq3c-572j Patch, Third Party Advisory
Changed
Reference Type
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/ No Types Assigned
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/ Third Party Advisory