ubuntu-cve-2018-3968
Vulnerability from osv_ubuntu
Published
2019-03-21 17:29
Modified
2025-07-16 04:53
Summary
Details

An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013.07-rc1 to 2014.07-rc2. The affected versions lack proper FIT signature enforcement, which allows an attacker to bypass U-Boot's verified boot and execute an unsigned kernel, embedded in a legacy image format. To trigger this vulnerability, a local attacker needs to be able to supply the image to boot.

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.2 (High)
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.0 (High)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "u-boot",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2019.07+dfsg-1ubuntu4~18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2019.07+dfsg-1ubuntu4~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2019.07+dfsg-1ubuntu4~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2016.03+dfsg1-6ubuntu2",
        "2018.07~rc3+dfsg1-0ubuntu1~18.04.1",
        "2018.07~rc3+dfsg1-0ubuntu2~18.04.1",
        "2018.07~rc3+dfsg1-0ubuntu3~18.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013.07-rc1 to 2014.07-rc2. The affected versions lack proper FIT signature enforcement, which allows an attacker to bypass U-Boot\u0027s verified boot and execute an unsigned kernel, embedded in a legacy image format. To trigger this vulnerability, a local attacker needs to be able to supply the image to boot.",
  "id": "UBUNTU-CVE-2018-3968",
  "modified": "2025-07-16T04:53:28Z",
  "published": "2019-03-21T17:29:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3968"
    },
    {
      "type": "REPORT",
      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2018-0633"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-3968"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-3968"
  ],
  "withdrawn": "2025-07-18T16:44:25Z"
}



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Sightings

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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.


Detection rules are retrieved from Rulezet.