CVE-2021-43860

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-43860
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43860.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-43860
Downstream
Related
Published
2022-01-12T22:15:07.977Z
Modified
2025-11-20T11:57:20.133324Z
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

Git / github.com/flatpak/flatpak

Affected ranges

Type
GIT
Repo
https://github.com/flatpak/flatpak
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
17cc9937cad5a10fdbb5dbac1febcc98a10b8d0c
Fixed
54ec1a482dfc668127eaae57f135e6a8e0bc52da
Fixed
65cbfac982cb1c83993a9e19aa424daee8e9f042
Fixed
93357d357119093804df05acc32ff335839c6451
Fixed
ba818f504c926baaf6e362be8159cfacf994310e
Fixed
d9a8f9d8ccc0b7c1135d0ecde006a75d25f66aee
Fixed
e528dcf196816de5e267d08456d1edd6877f8f73

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
1.10.3
1.10.4
1.10.5
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

Database specific

vanir_signatures

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        "digest": {
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        },
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        "digest": {
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        "signature_version": "v1",
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        "digest": {
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        "signature_version": "v1",
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