CVE-2022-21682

Published Jan 13, 2022

Last updated a year ago

Overview

Description: 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`.
Source: security-advisories@github.com
NVD status: Modified

Hype score: Not currently trending

Risk scores

CVSS 3.1

Type: Primary
Base score: 6.5
Impact score: 3.6
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Severity: MEDIUM

CVSS 2.0

Type: Primary
Base score: 4
Impact score: 2.9
Exploitability score: 8
Vector string: AV:N/AC:L/Au:S/C:N/I:P/A:N

Weaknesses

nvd@nist.gov: CWE-22
security-advisories@github.com: CWE-22

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "613765F7-BD3F-473D-99F7-EDB260050197",
            "versionEndExcluding": "1.10.7"
          },
          {
            "criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "4789481C-5282-4021-946B-0A75D38F6400",
            "versionEndExcluding": "1.12.4",
            "versionStartIncluding": "1.11.1"
          },
          {
            "criteria": "cpe:2.3:a:flatpak:flatpak-builder:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "F476472C-7143-4706-9E76-85EA7800A96F",
            "versionEndExcluding": "1.2.2"
          }
        ],
        "operator": "OR"
      }
    ]
  },
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA"
          }
        ],
        "operator": "OR"
      }
    ]
  },
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"
          }
        ],
        "operator": "OR"
      }
    ]
  },
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
          },
          {
            "criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"
          },
          {
            "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

Overview

Social media

Risk scores

CVSS 3.1

CVSS 2.0

Weaknesses

Configurations

References