VAR-202005-1245

Vulnerability from variot - Updated: 2022-05-17 01:52

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess. Authentication is not required to exploit this vulnerability.The specific flaw exists within bwscrp.exe when invoked via IOCTL 0x2711. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of Administrator.

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{
  "affected_products": {
    "_id": null,
    "data": [
      {
        "_id": null,
        "model": "webaccess",
        "scope": null,
        "trust": 0.7,
        "vendor": "advantech",
        "version": null
      }
    ],
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ]
  },
  "credits": {
    "_id": null,
    "data": "Natnael Samson (@NattiSamson)",
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ],
    "trust": 0.7
  },
  "cvss": {
    "_id": null,
    "data": [
      {
        "cvssV2": [],
        "cvssV3": [
          {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "author": "ZDI",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "exploitabilityScore": 3.9,
            "id": "ZDI-20-632",
            "impactScore": 5.9,
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "trust": 0.7,
            "userInteraction": "NONE",
            "vectorString": "AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          }
        ],
        "severity": [
          {
            "author": "ZDI",
            "id": "ZDI-20-632",
            "trust": 0.7,
            "value": "CRITICAL"
          }
        ]
      }
    ],
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ]
  },
  "description": {
    "_id": null,
    "data": "This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess. Authentication is not required to exploit this vulnerability.The specific flaw exists within bwscrp.exe when invoked via IOCTL 0x2711. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of Administrator.",
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ],
    "trust": 0.7
  },
  "external_ids": {
    "_id": null,
    "data": [
      {
        "db": "ZDI_CAN",
        "id": "ZDI-CAN-10325",
        "trust": 0.7
      },
      {
        "db": "ZDI",
        "id": "ZDI-20-632",
        "trust": 0.7
      }
    ],
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ]
  },
  "id": "VAR-202005-1245",
  "iot": {
    "_id": null,
    "data": true,
    "sources": [
      {
        "db": "VARIoT devices database",
        "id": null
      }
    ],
    "trust": 0.41739574
  },
  "last_update_date": "2022-05-17T01:52:29.600000Z",
  "patch": {
    "_id": null,
    "data": [
      {
        "title": "Advantech has issued an update to correct this vulnerability.",
        "trust": 0.7,
        "url": "https://www.us-cert.gov/ics/advisories/icsa-20-128-36"
      }
    ],
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ]
  },
  "references": {
    "_id": null,
    "data": [
      {
        "trust": 0.7,
        "url": "https://www.us-cert.gov/ics/advisories/icsa-20-128-36"
      }
    ],
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ]
  },
  "sources": {
    "_id": null,
    "data": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632",
        "ident": null
      }
    ]
  },
  "sources_release_date": {
    "_id": null,
    "data": [
      {
        "date": "2020-05-08T00:00:00",
        "db": "ZDI",
        "id": "ZDI-20-632",
        "ident": null
      }
    ]
  },
  "sources_update_date": {
    "_id": null,
    "data": [
      {
        "date": "2020-05-08T00:00:00",
        "db": "ZDI",
        "id": "ZDI-20-632",
        "ident": null
      }
    ]
  },
  "title": {
    "_id": null,
    "data": "Advantech WebAccess IOCTL 0x2711 bwscrp Stack-based Buffer Overflow Remote Code Execution Vulnerability",
    "sources": [
      {
        "db": "ZDI",
        "id": "ZDI-20-632"
      }
    ],
    "trust": 0.7
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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