ubuntu-cve-2015-8370
Vulnerability from osv_ubuntu
Published
2015-12-11 00:00
Modified
2025-09-08 16:43
Summary
Details

Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/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": "grub-common",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-coreboot",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-coreboot-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-amd64",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-amd64-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-arm",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-arm-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-arm64",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-arm64-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-ia32",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-efi-ia32-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-emu",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-firmware-qemu",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-ieee1275",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-ieee1275-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-linuxbios",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-pc",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-pc-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-rescue-pc",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-theme-starfield",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-uboot",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-uboot-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-xen",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub-xen-bin",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub2",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          },
          {
            "binary_name": "grub2-common",
            "binary_version": "2.02~beta2-9ubuntu1.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "grub2",
        "purl": "pkg:deb/ubuntu/grub2@2.02~beta2-9ubuntu1.6?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.02~beta2-9ubuntu1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.00-19ubuntu2",
        "2.00-19ubuntu3",
        "2.00-19ubuntu4",
        "2.00-20",
        "2.00-21",
        "2.00-22",
        "2.02~beta2-5",
        "2.02~beta2-6",
        "2.02~beta2-7",
        "2.02~beta2-8",
        "2.02~beta2-9",
        "2.02~beta2-9ubuntu1",
        "2.02~beta2-9ubuntu1.1",
        "2.02~beta2-9ubuntu1.2",
        "2.02~beta2-9ubuntu1.3",
        "2.02~beta2-9ubuntu1.4",
        "2.02~beta2-9ubuntu1.5"
      ]
    }
  ],
  "aliases": [],
  "details": "Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an \"Off-by-two\" or \"Out of bounds overwrite\" memory error.",
  "id": "UBUNTU-CVE-2015-8370",
  "modified": "2025-09-08T16:43:29Z",
  "published": "2015-12-11T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2015-8370"
    },
    {
      "type": "REPORT",
      "url": "https://twitter.com/lostinsecurity/status/674925944524640257"
    },
    {
      "type": "REPORT",
      "url": "http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2836-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2015-8370"
    }
  ],
  "related": [
    "USN-2836-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2015-8370"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.