CVE-2021-43860

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-43860
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-43860.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-43860
Aliases
  • GHSA-qpjc-vq3c-572j
Related
Published
2022-01-12T22:15:07Z
Modified
2024-10-12T08:36:49.892274Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:11 / flatpak

Package

Name
flatpak
Purl
pkg:deb/debian/flatpak?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.10.7-0+deb11u1

Affected versions

1.*

1.10.2-3
1.10.3-0+deb11u1~bpo11+1
1.10.3-0+deb11u1
1.10.5-0+deb11u1~bpo10+1
1.10.5-0+deb11u1
1.10.7-0+deb11u1~bpo10+1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / flatpak

Package

Name
flatpak
Purl
pkg:deb/debian/flatpak?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.12.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / flatpak

Package

Name
flatpak
Purl
pkg:deb/debian/flatpak?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.12.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Git / github.com/flatpak/flatpak

Affected ranges

Type
GIT
Repo
https://github.com/flatpak/flatpak
Events

Affected versions

0.*

0.1
0.10.0
0.10.1
0.10.2
0.11.1
0.11.2
0.11.3
0.11.4
0.11.5
0.11.6
0.11.7
0.11.8
0.11.8.1
0.11.8.2
0.11.8.3
0.2
0.2.1
0.3
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.4.0
0.4.1
0.4.10
0.4.11
0.4.12
0.4.13
0.4.2
0.4.2.1
0.4.3
0.4.4
0.4.5
0.4.6
0.4.7
0.4.8
0.4.9
0.5.0
0.5.1
0.5.2
0.6.0
0.6.1
0.6.10
0.6.11
0.6.12
0.6.13
0.6.14
0.6.2
0.6.3
0.6.4
0.6.5
0.6.6
0.6.7
0.6.8
0.6.9
0.8.0
0.8.1
0.9.1
0.9.10
0.9.11
0.9.12
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.9.8
0.9.9
0.9.98
0.9.98.1
0.9.98.2
0.9.99
0.99.1
0.99.2
0.99.3

1.*

1.0.0
1.0.1
1.0.2
1.0.3
1.1.0
1.1.1
1.1.2
1.1.3
1.10.0
1.10.1
1.10.2
1.11.1
1.11.2
1.11.3
1.12.0
1.12.1
1.12.2
1.2.0
1.2.1
1.3.0
1.3.1
1.3.2
1.3.3
1.3.4
1.4.0
1.5.0
1.5.1
1.5.2
1.6.0
1.6.1
1.6.2
1.7.1
1.7.2
1.7.3
1.8.0
1.9.1
1.9.2
1.9.3