{
  "cveId": "CVE-2020-8833",
  "url": "https://patchblox.com/security/cve/CVE-2020-8833",
  "summary": "CVE-2020-8833 is fixed in 11 products on 1 platform, first by apport 2.20.9-0ubuntu7.14, released April 1, 2020. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "apport: Time-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possib...",
  "description": "Time-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possible privilege escalation opportunity. If fs.protected_symlinks is disabled, this can be exploited between the os.open and os.chown calls when the Apport cron script clears out crash files of size 0. A symlink with the same name as the deleted file can then be created upon which chown will be called, changing the file owner to root. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.",
  "published": "2020-04-01T17:00:00Z",
  "severity": "Medium",
  "epss": 0.00344,
  "epssPercentile": 0.28068,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "apport",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "apport 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-apport-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "apport 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-apport-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-gtk",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "apport-gtk 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-apport-gtk-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-gtk",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "apport-gtk 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-apport-gtk-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-kde",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "apport-kde 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-apport-kde-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-kde",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "apport-kde 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-apport-kde-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-noui",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "apport-noui 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-apport-noui-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-noui",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "apport-noui 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-apport-noui-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-retrace",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "apport-retrace 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-apport-retrace-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-retrace",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "apport-retrace 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-apport-retrace-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-valgrind",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "apport-valgrind 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-apport-valgrind-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "apport-valgrind",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "apport-valgrind 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-apport-valgrind-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dh-apport",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "dh-apport 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dh-apport-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dh-apport",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "dh-apport 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dh-apport-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-apport",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "python-apport 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-apport-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-problem-report",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "python-problem-report 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-problem-report-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-apport",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "python3-apport 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-apport-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-apport",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "python3-apport 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-apport-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-problem-report",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.20.9-0ubuntu7.14",
      "fix": "python3-problem-report 2.20.9-0ubuntu7.14",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-problem-report-2.20.9-0ubuntu7.14",
      "released": "2020-04-01T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-problem-report",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.20.11-0ubuntu22",
      "fix": "python3-problem-report 2.20.11-0ubuntu22",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-problem-report-2.20.11-0ubuntu22",
      "released": "2020-04-01T17:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}