CVE-2015-8370 (GCVE-0-2015-8370)

Vulnerability from cvelistv5 – Published: 2015-12-16 00:00 – Updated: 2024-10-21 16:51
VLAI
Summary
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
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-06 21:01 UTC
CWE
  • n/a
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
Date Public
2015-12-10 00:00
Show details on NVD website
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                "name": "[oss-security] 20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]",
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              {
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              },
              {
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              },
              {
                "name": "DSA-3421",
                "tags": [
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                  "x_transferred"
                ],
                "url": "http://www.debian.org/security/2015/dsa-3421"
              },
              {
                "name": "[oss-security] 20240116 CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot manager",
                "tags": [
                  "mailing-list",
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                ],
                "url": "http://www.openwall.com/lists/oss-security/2024/01/15/3"
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            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "HIGH",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.4,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
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                  "privilegesRequired": "NONE",
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                    "options": [
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                        "Exploitation": "poc"
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                    "role": "CISA Coordinator",
                    "timestamp": "2024-03-06T21:01:48.674436Z",
                    "version": "2.0.3"
                  },
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
        "cna": {
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            {
              "product": "n/a",
              "vendor": "n/a",
              "versions": [
                {
                  "status": "affected",
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          ],
          "datePublic": "2015-12-10T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "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."
            }
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          "problemTypes": [
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            "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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          "references": [
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              "url": "http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html"
            },
            {
              "name": "openSUSE-SU-2015:2392",
              "tags": [
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              "url": "http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html"
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            {
              "name": "openSUSE-SU-2016:0036",
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              "url": "http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html"
            },
            {
              "url": "http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html"
            },
            {
              "name": "79358",
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              "name": "20151216 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]",
              "tags": [
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            },
            {
              "name": "GLSA-201512-03",
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              ],
              "url": "https://security.gentoo.org/glsa/201512-03"
            },
            {
              "name": "FEDORA-2015-cebe5133e7",
              "tags": [
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              ],
              "url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html"
            },
            {
              "name": "USN-2836-1",
              "tags": [
                "vendor-advisory"
              ],
              "url": "http://www.ubuntu.com/usn/USN-2836-1"
            },
            {
              "name": "FEDORA-2015-90c27b6e91",
              "tags": [
                "vendor-advisory"
              ],
              "url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html"
            },
            {
              "name": "RHSA-2015:2623",
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              "url": "http://rhn.redhat.com/errata/RHSA-2015-2623.html"
            },
            {
              "name": "SUSE-SU-2015:2399",
              "tags": [
                "vendor-advisory"
              ],
              "url": "http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html"
            },
            {
              "name": "DSA-3421",
              "tags": [
                "vendor-advisory"
              ],
              "url": "http://www.debian.org/security/2015/dsa-3421"
            },
            {
              "name": "[oss-security] 20240116 CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot manager",
              "tags": [
                "mailing-list"
              ],
              "url": "http://www.openwall.com/lists/oss-security/2024/01/15/3"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "assignerShortName": "mitre",
        "cveId": "CVE-2015-8370",
        "datePublished": "2015-12-16T00:00:00.000Z",
        "dateReserved": "2015-11-27T00:00:00.000Z",
        "dateUpdated": "2024-10-21T16:51:57.721Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.


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.