gsd-2020-11743
Vulnerability from gsd
Modified
2023-12-13 01:22
Details
An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.
Aliases
Aliases
CVE-2020-11743


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-11743",
    "description": "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.",
    "id": "GSD-2020-11743",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-11743.html",
      "https://www.debian.org/security/2020/dsa-4723",
      "https://ubuntu.com/security/CVE-2020-11743"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-11743"
      ],
      "details": "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.",
      "id": "GSD-2020-11743",
      "modified": "2023-12-13T01:22:05.358588Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ID": "CVE-2020-11743",
        "STATE": "PUBLIC"
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      "affects": {
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          }
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            "name": "https://xenbits.xen.org/xsa/advisory-316.html",
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            "url": "https://xenbits.xen.org/xsa/advisory-316.html"
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          {
            "name": "[oss-security] 20200414 Xen Security Advisory 316 v3 (CVE-2020-11743) - Bad error path in GNTTABOP_map_grant",
            "refsource": "MLIST",
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          },
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            "refsource": "DEBIAN",
            "url": "https://www.debian.org/security/2020/dsa-4723"
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    },
    "nvd.nist.gov": {
      "configurations": {
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            }
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              "refsource": "MISC",
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              "url": "http://xenbits.xen.org/xsa/advisory-316.html"
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              "name": "[oss-security] 20200414 Xen Security Advisory 316 v3 (CVE-2020-11743) - Bad error path in GNTTABOP_map_grant",
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              "url": "https://www.debian.org/security/2020/dsa-4723"
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          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 2.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2020-07-13T16:15Z",
      "publishedDate": "2020-04-14T13:15Z"
    }
  }
}


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