GSD-2021-32846

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba.
Aliases
Aliases
CVE-2021-32846
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{
  "GSD": {
    "alias": "CVE-2021-32846",
    "id": "GSD-2021-32846"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-32846"
      ],
      "details": "HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba.",
      "id": "GSD-2021-32846",
      "modified": "2023-12-13T01:23:09.394826Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-32846",
        "STATE": "PUBLIC",
        "TITLE": "Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "hyperkit",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "0.20210107",
                          "version_value": "0.20210107"
                        }
                      ]
                    }
                  }
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              "vendor_name": "moby"
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      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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            "lang": "eng",
            "value": "HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-908 Use of Uninitialized Resource"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/",
            "refsource": "CONFIRM",
            "url": "https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"
          },
          {
            "name": "https://github.com/moby/hyperkit/pull/313",
            "refsource": "MISC",
            "url": "https://github.com/moby/hyperkit/pull/313"
          },
          {
            "name": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
            "refsource": "MISC",
            "url": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba"
          }
        ]
      },
      "source": {
        "advisory": "GHSL-2021-057",
        "defect": [
          "GHSL-2021-057"
        ],
        "discovery": "UNKNOWN"
      }
    },
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        "nodes": [
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            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "0.20210107",
                "vulnerable": true
              }
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            "operator": "OR"
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      },
      "cve": {
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          "ID": "CVE-2021-32846"
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
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              "description": [
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                  "value": "CWE-754"
                }
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        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
              "refsource": "MISC",
              "tags": [
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              "url": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba"
            },
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              "name": "https://github.com/moby/hyperkit/pull/313",
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              "tags": [
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            },
            {
              "name": "https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2023-06-26T17:47Z",
      "publishedDate": "2023-02-17T23:15Z"
    }
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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