Vulnerability-Lookup

RHSA-2021:1068

Vulnerability from csaf_opensuse - Published: 2021-04-06 00:00 - Updated: 2026-09-20 11:13

Summary

security update for flatpak

Severity

Important

Notes

Title of the patch: security update for flatpak

Description of the patch: This security update provides a functional equivalent of RHSA-2021:1068. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2021:1068.

Patchnames: RHSA-2021:1068

CVE-2021-21381

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Recommended 5 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 8:flatpak-0:1.6.2-6.el8_3.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-libs-0:1.6.2-6.el8_3.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-libs-0:1.6.2-6.el8_3.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-selinux-0:1.6.2-6.el8_3.noarch	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-session-helper-0:1.6.2-6.el8_3.x86_64	—	Vendor Fix

Threats

Impact important

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://www.suse.com/security/cve/CVE-2021-21381/	self
https://www.suse.com/security/cve/CVE-2021-21381	external
https://bugzilla.suse.com/1183459	external

JSON

To clipboard

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}

CVE-2021-21381 (GCVE-0-2021-21381)

Vulnerability from cvelistv5 – Published: 2021-03-11 00:00 – Updated: 2024-08-03 18:09

Title

Sandbox escape via special tokens in .desktop file

Summary

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpack since version 0.9.4 and before version 1.10.2 has a vulnerability in the "file forwarding" feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app's permissions. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app's .desktop file, a malicious app publisher can trick flatpak into behaving as though the user had chosen to open a target file with their Flatpak app, which automatically makes that file available to the Flatpak app. This is fixed in version 1.10.2. A minimal solution is the first commit "`Disallow @@ and @@U usage in desktop files`". The follow-up commits "`dir: Reserve the whole @@ prefix`" and "`dir: Refuse to export .desktop files with suspicious uses of @@ tokens`" are recommended, but not strictly required. As a workaround, avoid installing Flatpak apps from untrusted sources, or check the contents of the exported `.desktop` files in `exports/share/applications/*.desktop` (typically `~/.local/share/flatpak/exports/share/applications/*.desktop` and `/var/lib/flatpak/exports/share/applications/*.desktop`) to make sure that literal filenames do not follow `@@` or `@@u`.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7619 records in the last 180 days details

References

10 references

URL	Tags
https://github.com/flatpak/flatpak/security/advis…
https://github.com/flatpak/flatpak/pull/4156
https://github.com/flatpak/flatpak/commit/8279c58…
https://github.com/flatpak/flatpak/commit/a7401e6…
https://github.com/flatpak/flatpak/commit/eb7946b…
https://github.com/flatpak/flatpak/releases/tag/1.10.2
https://www.debian.org/security/2021/dsa-4868	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://security.gentoo.org/glsa/202312-12	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
flatpak	flatpak	Affected: >= 0.9.4, < 1.10.2

Show details on NVD website

JSON

To clipboard

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        },
        {
          "url": "https://github.com/flatpak/flatpak/commit/eb7946bb6248923d8c90fe9b84425fef97ae580d"
        },
        {
          "url": "https://github.com/flatpak/flatpak/releases/tag/1.10.2"
        },
        {
          "name": "DSA-4868",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2021/dsa-4868"
        },
        {
          "name": "FEDORA-2021-26ad138ffa",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WXNVFOIB6ZP4DGOVKAM25T6OIEP3YLGV/"
        },
        {
          "name": "FEDORA-2021-fe7decc595",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MXXLXC2DPJ45HSMTI5MZYHMYEGQN6AA/"
        },
        {
          "name": "GLSA-202312-12",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202312-12"
        }
      ],
      "source": {
        "advisory": "GHSA-xgh4-387p-hqpp",
        "discovery": "UNKNOWN"
      },
      "title": "Sandbox escape via special tokens in .desktop file"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-21381",
    "datePublished": "2021-03-11T00:00:00.000Z",
    "dateReserved": "2020-12-22T00:00:00.000Z",
    "dateUpdated": "2024-08-03T18:09:15.945Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2021:1068

CVE-2021-21381 (GCVE-0-2021-21381)

Tags

Sightings

Nomenclature

Related by attack behaviour