MSRC_CVE-2015-8370

Vulnerability from csaf_microsoft - Published: 2015-12-02 00:00 - Updated: 2020-08-18 00:00
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.

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
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      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2015-8370 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. - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2015/msrc_cve-2015-8370.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
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        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "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.",
    "tracking": {
      "current_release_date": "2020-08-18T00:00:00.000Z",
      "generator": {
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  },
  "product_tree": {
    "branches": [
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          {
            "branches": [
              {
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                "product": {
                  "name": "CBL Mariner 1.0",
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            ],
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            "name": "Azure Linux"
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            "branches": [
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        "relates_to_product_reference": "16820"
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2015-8370",
      "notes": [
        {
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          "text": "mitre",
          "title": "Assigning CNA"
        }
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        "known_affected": [
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      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2015-8370 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. - VEX",
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      "remediations": [
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          "category": "vendor_fix",
          "date": "2020-08-18T00:00:00.000Z",
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      ],
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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.4,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "16820-1"
          ]
        }
      ],
      "title": "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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Detection rules are retrieved from Rulezet.